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ALSA-2026:54343 — Important: kernel security, bug fix, and enhancement update

Affected: AlmaLinux:10: kernel, AlmaLinux:10: kernel-64k, AlmaLinux:10: kernel-64k-core, AlmaLinux:10: kernel-64k-debug, AlmaLinux:10: kernel-64k-debug-core, AlmaLinux:10: kernel-64k-debug-devel, AlmaLinux:10: kernel-64k-debug-devel-matched, AlmaLinux:10: kernel-64k-debug-modules, AlmaLinux:10: kernel-64k-debug-modules-core, AlmaLinux:10: kernel-64k-debug-modules-extra and 65 more

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202) * kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264) * kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887) * kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300) * kernel: af_unix: set gc_in_progress to true in unix_gc() (CVE-2026-53361)

Bug Fix(es) and Enhancement(s):

* netfilter: CVE backports for AlmaLinux 10.2.z (JIRA:AlmaLinux-185311) * tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC Turin [almalinux-10.2.z] (JIRA:AlmaLinux-214436)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

BELL-CVE-2026-64300

Affected: Alpaquita:stream: linux-lts

certfr-2026-avi-1028 — De multiples vulnérabilités ont été découvertes dans le noyau Linux de Red Hat. Certaines d'entre elles permettent à un…

certfr-2026-avi-1028

EUVD-2026-353213

fkie_cve-2026-64300

In the Linux kernel, the following vulnerability has been resolved:

perf/aux: Fix page UAF in map_range()

map_range() reads rb->aux_pages[], rb->aux_nr_pages and rb->aux_pgoff via perf_mmap_to_page() while holding only event->mmap_mutex. Those fields are serialized by rb->aux_mutex, and mmap_mutex is per event.

Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows:

CPU 0 CPU 1 ===== ===== rb_alloc_aux() map_range() [1]: allocate rb->aux_pages[0] [2]: rb->aux_nr_pages++ [3]: perf_mmap_to_page() returns rb->aux_pages[0] [4]: map it as VM_PFNMAP [5]: rb->aux_pgoff = 1

munmap the page [6]: free rb->aux_pages[0]

Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a mapping to a freed physical frame.

Fix this by taking rb->aux_mutex across the page walk in map_range().

GHSA-643v-c574-jxr9

In the Linux kernel, the following vulnerability has been resolved:

perf/aux: Fix page UAF in map_range()

Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows:

munmap the page [6]: free rb->aux_pages[0]

Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a mapping to a freed physical frame.

Fix this by taking rb->aux_mutex across the page walk in map_range().

openSUSE-SU-2026:11476-1 — kernel-devel-7.1.7-1.1 on GA media

kernel-devel-7.1.7-1.1 on GA media

RLSA-2026:54343 — Important: kernel security, bug fix, and enhancement update

Affected: Rocky Linux:10: kernel

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202)

* kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)

* kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)

* kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300)

Bug Fix(es) and Enhancement(s):

* netfilter: CVE backports for Rocky Linux 10.2.z (JIRA:Rocky Linux-185311)

* tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC Turin [rhel-10.2.z] (JIRA:Rocky Linux-214436)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:23881-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

UBUNTU-CVE-2026-64300

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3, Ubuntu:18.04:LTS: linux-gke-4.15, Ubuntu:18.04:LTS: linux-gke-5.4 and 119 more

In the Linux kernel, the following vulnerability has been resolved: perf/aux: Fix page UAF in map_range() map_range() reads rb->aux_pages[], rb->aux_nr_pages and rb->aux_pgoff via perf_mmap_to_page() while holding only event->mmap_mutex. Those fields are serialized by rb->aux_mutex, and mmap_mutex is per event. Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows: CPU 0 CPU 1 ===== ===== rb_alloc_aux() map_range() [1]: allocate rb->aux_pages[0] [2]: rb->aux_nr_pages++ [3]: perf_mmap_to_page() returns rb->aux_pages[0] [4]: map it as VM_PFNMAP [5]: rb->aux_pgoff = 1 munmap the page [6]: free rb->aux_pages[0] Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a mapping to a freed physical frame. Fix this by taking rb->aux_mutex across the page walk in map_range().

WID-SEC-W-2026-2527 — Linux Kernel: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um nicht näher spezifizierte Angriffe durchzuführen, dazu können DoS-Angriffe, die Offenlegung von Informationen, die Beschädigung des Speichers oder die Umgehung von Sicherheitsmaßnahmen gehören.