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    <title>Most recent entries from all</title>
    <link>https://cve.radiocsirt.org</link>
    <description>Contains only the most 10 recent entries.</description>
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    <lastBuildDate>Fri, 02 Oct 2026 19:40:16 +0000</lastBuildDate>
    <item>
      <title>bdu:2026-07565</title>
      <link>https://cve.radiocsirt.org/vuln/bdu:2026-07565</link>
      <description>bdu:2026-07565</description>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/bdu:2026-07565</guid>
    </item>
    <item>
      <title>BELL-CVE-2026-22976</title>
      <link>https://cve.radiocsirt.org/vuln/bell-cve-2026-22976</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Alpaquita:23: linux-lts, Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Alpaquita:23: linux-lts, Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/bell-cve-2026-22976</guid>
    </item>
    <item>
      <title>certfr-2026-avi-0166 — De multiples vulnérabilités ont été découvertes dans le noyau Linux de Debian. Elles permettent à un attaquant de provo…</title>
      <link>https://cve.radiocsirt.org/vuln/certfr-2026-avi-0166</link>
      <description>certfr-2026-avi-0166</description>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/certfr-2026-avi-0166</guid>
    </item>
    <item>
      <title>EUVD-2026-326747</title>
      <link>https://cve.radiocsirt.org/vuln/euvd-2026-326747</link>
      <description>EUVD-2026-326747</description>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/euvd-2026-326747</guid>
    </item>
    <item>
      <title>fkie_cve-2026-22976</title>
      <link>https://cve.radiocsirt.org/vuln/fkie_cve-2026-22976</link>
      <description>&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset&lt;/p&gt;
&lt;p&gt;`qfq_class-&amp;gt;leaf_qdisc-&amp;gt;q.qlen &amp;gt; 0` does not imply that the class
itself is active.&lt;/p&gt;
&lt;p&gt;Two qfq_class objects may point to the same leaf_qdisc. This happens
when:&lt;/p&gt;
&lt;p&gt;1. one QFQ qdisc is attached to the dev as the root qdisc, and&lt;/p&gt;
&lt;p&gt;2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get()
/ qdisc_put()) and is pending to be destroyed, as in function
tc_new_tfilter.&lt;/p&gt;
&lt;p&gt;When packets are enqueued through the root QFQ qdisc, the shared
leaf_qdisc-&amp;gt;q.qlen increases. At the same time, the second QFQ
qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters
qfq_reset() with its own q-&amp;gt;q.qlen == 0, but its class&amp;#39;s leaf
qdisc-&amp;gt;q.qlen &amp;gt; 0. Therefore, the qfq_reset would wrongly deactivate
an inactive aggregate and trigger a null-deref in qfq_deactivate_agg:&lt;/p&gt;
&lt;p&gt;[    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    0.903571] #PF: supervisor write access in kernel mode
[    0.903860] #PF: error_code(0x0002) - not-present page
[    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0
[    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI
[    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE
[    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
[    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset&lt;/p&gt;
&lt;p&gt;`qfq_class-&amp;gt;leaf_qdisc-&amp;gt;q.qlen &amp;gt; 0` does not imply that the class
itself is active.&lt;/p&gt;
&lt;p&gt;Two qfq_class objects may point to the same leaf_qdisc. This happens
when:&lt;/p&gt;
&lt;p&gt;1. one QFQ qdisc is attached to the dev as the root qdisc, and&lt;/p&gt;
&lt;p&gt;2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get()
/ qdisc_put()) and is pending to be destroyed, as in function
tc_new_tfilter.&lt;/p&gt;
&lt;p&gt;When packets are enqueued through the root QFQ qdisc, the shared
leaf_qdisc-&amp;gt;q.qlen increases. At the same time, the second QFQ
qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters
qfq_reset() with its own q-&amp;gt;q.qlen == 0, but its class&amp;#39;s leaf
qdisc-&amp;gt;q.qlen &amp;gt; 0. Therefore, the qfq_reset would wrongly deactivate
an inactive aggregate and trigger a null-deref in qfq_deactivate_agg:&lt;/p&gt;
&lt;p&gt;[    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    0.903571] #PF: supervisor write access in kernel mode
[    0.903860] #PF: error_code(0x0002) - not-present page
[    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0
[    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI
[    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE
[    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
[    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/fkie_cve-2026-22976</guid>
    </item>
    <item>
      <title>GHSA-f4fv-h3x5-8339</title>
      <link>https://cve.radiocsirt.org/vuln/ghsa-f4fv-h3x5-8339</link>
      <description>&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset&lt;/p&gt;
&lt;p&gt;`qfq_class-&amp;gt;leaf_qdisc-&amp;gt;q.qlen &amp;gt; 0` does not imply that the class
itself is active.&lt;/p&gt;
&lt;p&gt;Two qfq_class objects may point to the same leaf_qdisc. This happens
when:&lt;/p&gt;
&lt;p&gt;1. one QFQ qdisc is attached to the dev as the root qdisc, and&lt;/p&gt;
&lt;p&gt;2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get()
/ qdisc_put()) and is pending to be destroyed, as in function
tc_new_tfilter.&lt;/p&gt;
&lt;p&gt;When packets are enqueued through the root QFQ qdisc, the shared
leaf_qdisc-&amp;gt;q.qlen increases. At the same time, the second QFQ
qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters
qfq_reset() with its own q-&amp;gt;q.qlen == 0, but its class&amp;#39;s leaf
qdisc-&amp;gt;q.qlen &amp;gt; 0. Therefore, the qfq_reset would wrongly deactivate
an inactive aggregate and trigger a null-deref in qfq_deactivate_agg:&lt;/p&gt;
&lt;p&gt;[    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    0.903571] #PF: supervisor write access in kernel mode
[    0.903860] #PF: error_code(0x0002) - not-present page
[    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0
[    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI
[    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE
[    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
[    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:&lt;/p&gt;
&lt;p&gt;net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset&lt;/p&gt;
&lt;p&gt;`qfq_class-&amp;gt;leaf_qdisc-&amp;gt;q.qlen &amp;gt; 0` does not imply that the class
itself is active.&lt;/p&gt;
&lt;p&gt;Two qfq_class objects may point to the same leaf_qdisc. This happens
when:&lt;/p&gt;
&lt;p&gt;1. one QFQ qdisc is attached to the dev as the root qdisc, and&lt;/p&gt;
&lt;p&gt;2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get()
/ qdisc_put()) and is pending to be destroyed, as in function
tc_new_tfilter.&lt;/p&gt;
&lt;p&gt;When packets are enqueued through the root QFQ qdisc, the shared
leaf_qdisc-&amp;gt;q.qlen increases. At the same time, the second QFQ
qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters
qfq_reset() with its own q-&amp;gt;q.qlen == 0, but its class&amp;#39;s leaf
qdisc-&amp;gt;q.qlen &amp;gt; 0. Therefore, the qfq_reset would wrongly deactivate
an inactive aggregate and trigger a null-deref in qfq_deactivate_agg:&lt;/p&gt;
&lt;p&gt;[    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000
[    0.903571] #PF: supervisor write access in kernel mode
[    0.903860] #PF: error_code(0x0002) - not-present page
[    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0
[    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI
[    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE
[    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
[    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/ghsa-f4fv-h3x5-8339</guid>
    </item>
    <item>
      <title>ICSA-26-188-05 — Siemens SINEC OS</title>
      <link>https://cve.radiocsirt.org/vuln/icsa-26-188-05</link>
      <description>&lt;p&gt;A vulnerability has been found in GNU elfutils 0.192 and classified as critical. This vulnerability affects the function __libdw_thread_tail in the library libdw_alloc.c of the component eu-readelf. The manipulation of the argument w leads to memory corruption. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is 2636426a091bd6c6f7f02e49ab20d4cdc6bfc753. It is recommended to apply a patch to fix this issue. A vulnerability classified as problematic was found in GNU elfutils 0.192. This vulnerability affects the function elf_strptr in the library /libelf/elf_strptr.c of the component eu-strip. The manipulation leads to denial of service. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is b16f441cca0a4841050e3215a9f120a6d8aea918. It is recommended to apply a patch to fix this issue. A flaw was found in how GLib’s GString manages memory when adding data to strings. If a string is already very large, combining it with more input can cause a hidden overflow in the size calculation. This makes the system think it has enough memory when it doesn’t. As a result, data may be written past the end of the allocated memory, leading to crashes or memory corrup…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;A vulnerability has been found in GNU elfutils 0.192 and classified as critical. This vulnerability affects the function __libdw_thread_tail in the library libdw_alloc.c of the component eu-readelf. The manipulation of the argument w leads to memory corruption. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is 2636426a091bd6c6f7f02e49ab20d4cdc6bfc753. It is recommended to apply a patch to fix this issue. A vulnerability classified as problematic was found in GNU elfutils 0.192. This vulnerability affects the function elf_strptr in the library /libelf/elf_strptr.c of the component eu-strip. The manipulation leads to denial of service. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is b16f441cca0a4841050e3215a9f120a6d8aea918. It is recommended to apply a patch to fix this issue. A flaw was found in how GLib’s GString manages memory when adding data to strings. If a string is already very large, combining it with more input can cause a hidden overflow in the size calculation. This makes the system think it has enough memory when it doesn’t. As a result, data may be written past the end of the allocated memory, leading to crashes or memory corrup…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/icsa-26-188-05</guid>
    </item>
    <item>
      <title>msrc_CVE-2026-22976 — net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset</title>
      <link>https://cve.radiocsirt.org/vuln/msrc_cve-2026-22976</link>
      <description>msrc_CVE-2026-22976</description>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/msrc_cve-2026-22976</guid>
    </item>
    <item>
      <title>OESA-2026-2417 — kernel security update</title>
      <link>https://cve.radiocsirt.org/vuln/oesa-2026-2417</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; openEuler:24.03-LTS: kernel&lt;/p&gt;
&lt;p&gt;The Linux Kernel, the operating system core itself.&#13;
&#13;
Security Fix(es):&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MMWe currently assume that there is at least one VMA in a MM, which isn ttrue.So we might end up having find_vma() return NULL, to then de-referenceNULL.  So properly handle find_vma() returning NULL.This fixes the report:Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTIKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline]RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194Code: ...RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8FS:  00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0DR0…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; openEuler:24.03-LTS: kernel&lt;/p&gt;
&lt;p&gt;The Linux Kernel, the operating system core itself.&#13;
&#13;
Security Fix(es):&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved:mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MMWe currently assume that there is at least one VMA in a MM, which isn ttrue.So we might end up having find_vma() return NULL, to then de-referenceNULL.  So properly handle find_vma() returning NULL.This fixes the report:Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTIKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline]RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194Code: ...RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8FS:  00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0DR0…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/oesa-2026-2417</guid>
    </item>
    <item>
      <title>openSUSE-SU-2026:20287-1 — Security update for the Linux Kernel</title>
      <link>https://cve.radiocsirt.org/vuln/opensuse-su-2026:20287-1</link>
      <description>&lt;p&gt;Security update for the Linux Kernel&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;Security update for the Linux Kernel&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/opensuse-su-2026:20287-1</guid>
    </item>
    <item>
      <title>SSA-253495 — SSA-253495: Multiple Vulnerabilities in SINEC OS before V4.0</title>
      <link>https://cve.radiocsirt.org/vuln/ssa-253495</link>
      <description>&lt;p&gt;A vulnerability has been found in GNU elfutils 0.192 and classified as critical. This vulnerability affects the function __libdw_thread_tail in the library libdw_alloc.c of the component eu-readelf. The manipulation of the argument w leads to memory corruption. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is 2636426a091bd6c6f7f02e49ab20d4cdc6bfc753. It is recommended to apply a patch to fix this issue. A vulnerability classified as problematic was found in GNU elfutils 0.192. This vulnerability affects the function elf_strptr in the library /libelf/elf_strptr.c of the component eu-strip. The manipulation leads to denial of service. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is b16f441cca0a4841050e3215a9f120a6d8aea918. It is recommended to apply a patch to fix this issue. A flaw was found in how GLib’s GString manages memory when adding data to strings. If a string is already very large, combining it with more input can cause a hidden overflow in the size calculation. This makes the system think it has enough memory when it doesn’t. As a result, data may be written past the end of the allocated memory, leading to crashes or memory corrup…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;A vulnerability has been found in GNU elfutils 0.192 and classified as critical. This vulnerability affects the function __libdw_thread_tail in the library libdw_alloc.c of the component eu-readelf. The manipulation of the argument w leads to memory corruption. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is 2636426a091bd6c6f7f02e49ab20d4cdc6bfc753. It is recommended to apply a patch to fix this issue. A vulnerability classified as problematic was found in GNU elfutils 0.192. This vulnerability affects the function elf_strptr in the library /libelf/elf_strptr.c of the component eu-strip. The manipulation leads to denial of service. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is b16f441cca0a4841050e3215a9f120a6d8aea918. It is recommended to apply a patch to fix this issue. A flaw was found in how GLib’s GString manages memory when adding data to strings. If a string is already very large, combining it with more input can cause a hidden overflow in the size calculation. This makes the system think it has enough memory when it doesn’t. As a result, data may be written past the end of the allocated memory, leading to crashes or memory corrup…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/ssa-253495</guid>
    </item>
    <item>
      <title>SUSE-SU-2026:0473-1 — Security update for the Linux Kernel</title>
      <link>https://cve.radiocsirt.org/vuln/suse-su-2026:0473-1</link>
      <description>&lt;p&gt;Security update for the Linux Kernel&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;Security update for the Linux Kernel&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/suse-su-2026:0473-1</guid>
    </item>
    <item>
      <title>UBUNTU-CVE-2026-22976</title>
      <link>https://cve.radiocsirt.org/vuln/ubuntu-cve-2026-22976</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Ubuntu:Pro:14.04:LTS: linux, Ubuntu:Pro:14.04:LTS: linux-aws, Ubuntu:Pro:14.04:LTS: linux-azure, Ubuntu:Pro:14.04:LTS: linux-lts-xenial, Ubuntu:Pro:16.04:LTS: linux, Ubuntu:Pro:16.04:LTS: linux-aws, Ubuntu:Pro:16.04:LTS: linux-aws-hwe, Ubuntu:Pro:16.04:LTS: linux-azure, Ubuntu:Pro:16.04:LTS: linux-gcp, Ubuntu:Pro:16.04:LTS: linux-hwe and 231 more&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset `qfq_class-&amp;gt;leaf_qdisc-&amp;gt;q.qlen &amp;gt; 0` does not imply that the class itself is active. Two qfq_class objects may point to the same leaf_qdisc. This happens when: 1. one QFQ qdisc is attached to the dev as the root qdisc, and 2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get() / qdisc_put()) and is pending to be destroyed, as in function tc_new_tfilter. When packets are enqueued through the root QFQ qdisc, the shared leaf_qdisc-&amp;gt;q.qlen increases. At the same time, the second QFQ qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters qfq_reset() with its own q-&amp;gt;q.qlen == 0, but its class&amp;#39;s leaf qdisc-&amp;gt;q.qlen &amp;gt; 0. Therefore, the qfq_reset would wrongly deactivate an inactive aggregate and trigger a null-deref in qfq_deactivate_agg: [    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000 [    0.903571] #PF: supervisor write access in kernel mode [    0.903860] #PF: error_code(0x0002) - not-present page [    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0 [    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI [    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE [    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 [    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux/list.h…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Ubuntu:Pro:14.04:LTS: linux, Ubuntu:Pro:14.04:LTS: linux-aws, Ubuntu:Pro:14.04:LTS: linux-azure, Ubuntu:Pro:14.04:LTS: linux-lts-xenial, Ubuntu:Pro:16.04:LTS: linux, Ubuntu:Pro:16.04:LTS: linux-aws, Ubuntu:Pro:16.04:LTS: linux-aws-hwe, Ubuntu:Pro:16.04:LTS: linux-azure, Ubuntu:Pro:16.04:LTS: linux-gcp, Ubuntu:Pro:16.04:LTS: linux-hwe and 231 more&lt;/p&gt;
&lt;p&gt;In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in qfq_reset `qfq_class-&amp;gt;leaf_qdisc-&amp;gt;q.qlen &amp;gt; 0` does not imply that the class itself is active. Two qfq_class objects may point to the same leaf_qdisc. This happens when: 1. one QFQ qdisc is attached to the dev as the root qdisc, and 2. another QFQ qdisc is temporarily referenced (e.g., via qdisc_get() / qdisc_put()) and is pending to be destroyed, as in function tc_new_tfilter. When packets are enqueued through the root QFQ qdisc, the shared leaf_qdisc-&amp;gt;q.qlen increases. At the same time, the second QFQ qdisc triggers qdisc_put and qdisc_destroy: the qdisc enters qfq_reset() with its own q-&amp;gt;q.qlen == 0, but its class&amp;#39;s leaf qdisc-&amp;gt;q.qlen &amp;gt; 0. Therefore, the qfq_reset would wrongly deactivate an inactive aggregate and trigger a null-deref in qfq_deactivate_agg: [    0.903172] BUG: kernel NULL pointer dereference, address: 0000000000000000 [    0.903571] #PF: supervisor write access in kernel mode [    0.903860] #PF: error_code(0x0002) - not-present page [    0.904177] PGD 10299b067 P4D 10299b067 PUD 10299c067 PMD 0 [    0.904502] Oops: Oops: 0002 [#1] SMP NOPTI [    0.904737] CPU: 0 UID: 0 PID: 135 Comm: exploit Not tainted 6.19.0-rc3+ #2 NONE [    0.905157] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 [    0.905754] RIP: 0010:qfq_deactivate_agg (include/linux/list.h…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/ubuntu-cve-2026-22976</guid>
    </item>
    <item>
      <title>WID-SEC-W-2026-0184 — Linux Kernel: Schwachstelle ermöglicht Denial of Service</title>
      <link>https://cve.radiocsirt.org/vuln/wid-sec-w-2026-0184</link>
      <description>&lt;p&gt;Ein entfernter, anonymer Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;Ein entfernter, anonymer Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/wid-sec-w-2026-0184</guid>
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