Description
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock. This is the path for the deadlock. mem_pool_alloc() -> raw_spin_lock_irqsave(&kmemleak_lock, flags); -> pr_warn_once() -> netconsole subsystem -> netpoll -> __alloc_skb -> __create_object -> raw_spin_lock_irqsave(&kmemleak_lock, flags); Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
c5665868183fec689dbab9fb8505188b2c4f0757 to < c7b6ea0ede687e7460e593c5ea478f50aa41682aaffectedc5665868183fec689dbab9fb8505188b2c4f0757 to < 4b0151e1d468eb2667c37b7af99b3c075072d334affectedc5665868183fec689dbab9fb8505188b2c4f0757 to < f249d32bb54876b4b6c3ae071af8ddca77af390baffectedc5665868183fec689dbab9fb8505188b2c4f0757 to < 62879faa8efe8d8a9c7bf7606ee9c068012d7dacaffectedc5665868183fec689dbab9fb8505188b2c4f0757 to < 1da95d3d4b7b1d380ebd87b71a61e7e6aed3265daffectedc5665868183fec689dbab9fb8505188b2c4f0757 to < a0854de00ce2ee27edf39037e7836ad580eb3350affectedc5665868183fec689dbab9fb8505188b2c4f0757 to < 08f70be5e406ce47c822f2dd11c1170ca259605baffectedc5665868183fec689dbab9fb8505188b2c4f0757 to < a181b228b37a6a5625dad2bb4265bb7abb673e9faffectedc5665868183fec689dbab9fb8505188b2c4f0757 to < 47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2affected
Linux Linux
Default version status: affected
5.4affected0 to < 5.4unaffected5.4.297 to ≤ 5.4.*unaffected5.10.241 to ≤ 5.10.*unaffected5.15.190 to ≤ 5.15.*unaffected6.1.149 to ≤ 6.1.*unaffected6.6.103 to ≤ 6.6.*unaffected6.12.43 to ≤ 6.12.*unaffected6.15.11 to ≤ 6.15.*unaffected6.16.2 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a ↗
- https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334 ↗
- https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b ↗
- https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac ↗
- https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d ↗
- https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350 ↗
- https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b ↗
- https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f ↗
- https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html ↗