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ALSA-2025:15782 — Moderate: kernel security update

Affected: AlmaLinux:10: kernel-abi-stablelists, AlmaLinux:10: kernel-doc

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

Security Fix(es):

* kernel: ublk: make sure ubq->canceling is set when queue is frozen (CVE-2025-22068) * kernel: scsi: lpfc: Use memcpy() for BIOS version (CVE-2025-38332) * kernel: idpf: convert control queue mutex to a spinlock (CVE-2025-38392) * kernel: tcp: Correct signedness in skb remaining space calculation (CVE-2025-38463) * kernel: do_change_type(): refuse to operate on unmounted/not ours mounts (CVE-2025-38498) * kernel: xfrm: interface: fix use-after-free after changing collect_md xfrm interface (CVE-2025-38500) * kernel: ipv6: mcast: Delay put pmc->idev in mld_del_delrec() (CVE-2025-38550)

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.

bdu:2025-09816

BELL-CVE-2025-38463

Affected: Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

certfr-2025-avi-0698 — De multiples vulnérabilités ont été découvertes dans le noyau Linux de Debian. Certaines d'entre elles permettent à un…

certfr-2025-avi-0698

EUVD-2026-347054

fkie_cve-2025-38463

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

tcp: Correct signedness in skb remaining space calculation

Syzkaller reported a bug [1] where sk->sk_forward_alloc can overflow.

When we send data, if an skb exists at the tail of the write queue, the kernel will attempt to append the new data to that skb. However, the code that checks for available space in the skb is flawed: ''' copy = size_goal - skb->len '''

The types of the variables involved are: ''' copy: ssize_t (s64 on 64-bit systems) size_goal: int skb->len: unsigned int '''

Due to C's type promotion rules, the signed size_goal is converted to an unsigned int to match skb->len before the subtraction. The result is an unsigned int.

When this unsigned int result is then assigned to the s64 copy variable, it is zero-extended, preserving its non-negative value. Consequently, copy is always >= 0.

Assume we are sending 2GB of data and size_goal has been adjusted to a value smaller than skb->len. The subtraction will result in copy holding a very large positive integer. In the subsequent logic, this large value is used to update sk->sk_forward_alloc, which can easily cause it to overflow.

The syzkaller reproducer uses TCP_REPAIR to reliably create this condition. However, this can also occur in real-world scenarios. The tcp_bound_to_half_wnd() function can also reduce size_goal to a small value. This would cause the subsequent tcp_wmem_schedule() to set sk->sk_forward_alloc to a value close to INT…

GHSA-7fhq-j7h5-cjxg

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

tcp: Correct signedness in skb remaining space calculation

Syzkaller reported a bug [1] where sk->sk_forward_alloc can overflow.

The types of the variables involved are: ''' copy: ssize_t (s64 on 64-bit systems) size_goal: int skb->len: unsigned int '''

Due to C's type promotion rules, the signed size_goal is converted to an unsigned int to match skb->len before the subtraction. The result is an unsigned int.

When this unsigned int result is then assigned to the s64 copy variable, it is zero-extended, preserving its non-negative value. Consequently, copy is always >= 0.

msrc_CVE-2025-38463 — tcp: Correct signedness in skb remaining space calculation

msrc_CVE-2025-38463

OESA-2025-2077 — kernel security update

Affected: openEuler:24.03-LTS: kernel

The Linux Kernel, the operating system core itself. Security Fix(es):

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

mac802154: check local interfaces before deleting sdata list

syzkaller reported a corrupted list in ieee802154_if_remove. [1]

Remove an IEEE 802.15.4 network interface after unregister an IEEE 802.15.4 hardware device from the system.

CPU0 CPU1 ==== ==== genl_family_rcv_msg_doit ieee802154_unregister_hw ieee802154_del_iface ieee802154_remove_interfaces rdev_del_virtual_intf_deprecated list_del(&sdata->list) ieee802154_if_remove list_del_rcu

The net device has been unregistered, since the rcu grace period, unregistration must be run before ieee802154_if_remove.

To avoid this issue, add a check for local->interfaces before deleting sdata list.

[1] kernel BUG at lib/list_debug.c:58! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 6277 Comm: syz-executor157 Not tainted 6.12.0-rc6-syzkaller-00005-g557329bcecc2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__list_del_entry_valid_or_report+0xf4/0x140 lib/list_debug.c:56 Code: e8 a1 7e 00 07 90 0f 0b 48 c7 c7 e0 37 60 8c 4c 89 fe e8 8f 7e 00 07 90 0f 0b 48 c7 c7 40 38 60 8c 4c 89 fe e8 7d 7e 00 07 90 <0f> 0b 48 c7 c7 a0 38 60 8c 4c 89 fe e8 6b 7e 00 07 90 0f 0b 48 c7 RSP: 0018:ffffc9000490f3d0 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000122 RCX: d211eee56bb28d00 RDX:…

openSUSE-SU-2025:20081-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

RHSA-2025:15782 — Red Hat Security Advisory: kernel security update

kernel: ublk: make sure ubq->canceling is set when queue is frozen kernel: scsi: lpfc: Use memcpy() for BIOS version kernel: idpf: convert control queue mutex to a spinlock kernel: tcp: Correct signedness in skb remaining space calculation kernel: do_change_type(): refuse to operate on unmounted/not ours mounts kernel: xfrm: interface: fix use-after-free after changing collect_md xfrm interface kernel: ipv6: mcast: Delay put pmc->idev in mld_del_delrec() kernel: net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM

SUSE-SU-2025:02853-1 — Security update for the Linux Kernel

Security update for the Linux Kernel

UBUNTU-CVE-2025-38463

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 123 more

In the Linux kernel, the following vulnerability has been resolved: tcp: Correct signedness in skb remaining space calculation Syzkaller reported a bug [1] where sk->sk_forward_alloc can overflow. When we send data, if an skb exists at the tail of the write queue, the kernel will attempt to append the new data to that skb. However, the code that checks for available space in the skb is flawed: ''' copy = size_goal - skb->len ''' The types of the variables involved are: ''' copy: ssize_t (s64 on 64-bit systems) size_goal: int skb->len: unsigned int ''' Due to C's type promotion rules, the signed size_goal is converted to an unsigned int to match skb->len before the subtraction. The result is an unsigned int. When this unsigned int result is then assigned to the s64 copy variable, it is zero-extended, preserving its non-negative value. Consequently, copy is always >= 0. Assume we are sending 2GB of data and size_goal has been adjusted to a value smaller than skb->len. The subtraction will result in copy holding a very large positive integer. In the subsequent logic, this large value is used to update sk->sk_forward_alloc, which can easily cause it to overflow. The syzkaller reproducer uses TCP_REPAIR to reliably create this condition. However, this can also occur in real-world scenarios. The tcp_bound_to_half_wnd() function can also reduce size_goal to a small value. This would cause the subsequent tcp_wmem_schedule() to set sk->sk_forward_alloc to a value close to INT_MAX. Fu…

WID-SEC-W-2025-1653 — Linux Kernel: Mehrere Schwachstellen

Ein entfernter anonymer Angreifer kann mehrere Schwachstellen im Linux-Kernel ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen oder andere nicht spezifizierte Angriffe durchzuführen.