Security update for the Linux Kernel (Live Patch 64 for SUSE Linux Enterprise 12 SP5) SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2026:0518-1 Final 1 1 2026-02-14T09:03:51Z current 2026-02-14T09:03:51Z 2026-02-14T09:03:51Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for the Linux Kernel (Live Patch 64 for SUSE Linux Enterprise 12 SP5) This update for the SUSE Linux Enterprise kernel 4.12.14-122.244 fixes various security issues The following security issues were fixed: - CVE-2023-53321: wifi: mac80211_hwsim: drop short frames (bsc#1250314). - CVE-2025-38352: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() (bsc#1249205). - CVE-2025-40186: tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request() (bsc#1253439). The following non security issue was fixed: - bsc#1250280: don't expose {file,inode}_operations with static lifetimes Fix issue with static lifetime empty_iops/no_open_fops by allocating them on the heap. Make sure previously assigned instances don't become dangling. (bsc#1250280). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2026-518,SUSE-SLE-Live-Patching-12-SP5-2026-518 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2026/suse-su-20260518-1/ Link for SUSE-SU-2026:0518-1 https://lists.suse.com/pipermail/sle-security-updates/2026-February/024257.html E-Mail link for SUSE-SU-2026:0518-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1249205 SUSE Bug 1249205 https://bugzilla.suse.com/1250280 SUSE Bug 1250280 https://bugzilla.suse.com/1250314 SUSE Bug 1250314 https://bugzilla.suse.com/1253439 SUSE Bug 1253439 https://www.suse.com/security/cve/CVE-2023-53321/ SUSE CVE CVE-2023-53321 page https://www.suse.com/security/cve/CVE-2025-38352/ SUSE CVE CVE-2025-38352 page https://www.suse.com/security/cve/CVE-2025-40186/ SUSE CVE CVE-2025-40186 page SUSE Linux Enterprise Live Patching 12 SP5 kgraft-patch-4_12_14-122_244-default-15-2.1 kgraft-patch-4_12_14-122_244-default-15-2.1 as a component of SUSE Linux Enterprise Live Patching 12 SP5 In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: drop short frames While technically some control frames like ACK are shorter and end after Address 1, such frames shouldn't be forwarded through wmediumd or similar userspace, so require the full 3-address header to avoid accessing invalid memory if shorter frames are passed in. CVE-2023-53321 SUSE Linux Enterprise Live Patching 12 SP5:kgraft-patch-4_12_14-122_244-default-15-2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-20260518-1/ https://www.suse.com/security/cve/CVE-2023-53321.html CVE-2023-53321 https://bugzilla.suse.com/1250313 SUSE Bug 1250313 https://bugzilla.suse.com/1250314 SUSE Bug 1250314 In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand(). If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail. Add the tsk->exit_state check into run_posix_cpu_timers() to fix this. This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case. CVE-2025-38352 SUSE Linux Enterprise Live Patching 12 SP5:kgraft-patch-4_12_14-122_244-default-15-2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-20260518-1/ https://www.suse.com/security/cve/CVE-2025-38352.html CVE-2025-38352 https://bugzilla.suse.com/1246911 SUSE Bug 1246911 https://bugzilla.suse.com/1249205 SUSE Bug 1249205 In the Linux kernel, the following vulnerability has been resolved: tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). syzbot reported the splat below in tcp_conn_request(). [0] If a listener is close()d while a TFO socket is being processed in tcp_conn_request(), inet_csk_reqsk_queue_add() does not set reqsk->sk and calls inet_child_forget(), which calls tcp_disconnect() for the TFO socket. After the cited commit, tcp_disconnect() calls reqsk_fastopen_remove(), where reqsk_put() is called due to !reqsk->sk. Then, reqsk_fastopen_remove() in tcp_conn_request() decrements the last req->rsk_refcnt and frees reqsk, and __reqsk_free() at the drop_and_free label causes the refcount underflow for the listener and double-free of the reqsk. Let's remove reqsk_fastopen_remove() in tcp_conn_request(). Note that other callers make sure tp->fastopen_rsk is not NULL. [0]: refcount_t: underflow; use-after-free. WARNING: CPU: 12 PID: 5563 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28) Modules linked in: CPU: 12 UID: 0 PID: 5563 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:refcount_warn_saturate (lib/refcount.c:28) Code: ab e8 8e b4 98 ff 0f 0b c3 cc cc cc cc cc 80 3d a4 e4 d6 01 00 75 9c c6 05 9b e4 d6 01 01 48 c7 c7 e8 df fb ab e8 6a b4 98 ff <0f> 0b e9 03 5b 76 00 cc 80 3d 7d e4 d6 01 00 0f 85 74 ff ff ff c6 RSP: 0018:ffffa79fc0304a98 EFLAGS: 00010246 RAX: d83af4db1c6b3900 RBX: ffff9f65c7a69020 RCX: d83af4db1c6b3900 RDX: 0000000000000000 RSI: 00000000ffff7fff RDI: ffffffffac78a280 RBP: 000000009d781b60 R08: 0000000000007fff R09: ffffffffac6ca280 R10: 0000000000017ffd R11: 0000000000000004 R12: ffff9f65c7b4f100 R13: ffff9f65c7d23c00 R14: ffff9f65c7d26000 R15: ffff9f65c7a64ef8 FS: 00007f9f962176c0(0000) GS:ffff9f65fcf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000180 CR3: 000000000dbbe006 CR4: 0000000000372ef0 Call Trace: <IRQ> tcp_conn_request (./include/linux/refcount.h:400 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/sock.h:1965 ./include/net/request_sock.h:131 net/ipv4/tcp_input.c:7301) tcp_rcv_state_process (net/ipv4/tcp_input.c:6708) tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1670) tcp_v6_rcv (net/ipv6/tcp_ipv6.c:1906) ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438) ip6_input (net/ipv6/ip6_input.c:500) ipv6_rcv (net/ipv6/ip6_input.c:311) __netif_receive_skb (net/core/dev.c:6104) process_backlog (net/core/dev.c:6456) __napi_poll (net/core/dev.c:7506) net_rx_action (net/core/dev.c:7569 net/core/dev.c:7696) handle_softirqs (kernel/softirq.c:579) do_softirq (kernel/softirq.c:480) </IRQ> CVE-2025-40186 SUSE Linux Enterprise Live Patching 12 SP5:kgraft-patch-4_12_14-122_244-default-15-2.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-20260518-1/ https://www.suse.com/security/cve/CVE-2025-40186.html CVE-2025-40186 https://bugzilla.suse.com/1253438 SUSE Bug 1253438 https://bugzilla.suse.com/1253439 SUSE Bug 1253439