CVE-2025-39736mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock
Updated under an hour ago ()
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It affects Linux and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- May 12, 2026
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
Linux Linux linux:linux (from the name) | from c5665868183fec689dbab9fb8505188b2c4f0757 before c7b6ea0ede687e7460e593c5ea478f50aa41682a; from c5665868183fec689dbab9fb8505188b2c4f0757 before 4b0151e1d468eb2667c37b7af99b3c075072d334; from c5665868183fec689dbab9fb8505188b2c4f0757 before f249d32bb54876b4b6c3ae071af8ddca77af390b; from c5665868183fec689dbab9fb8505188b2c4f0757 before 62879faa8efe8d8a9c7bf7606ee9c068012d7dac; from c5665868183fec689dbab9fb8505188b2c4f0757 before 1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d; from c5665868183fec689dbab9fb8505188b2c4f0757 before a0854de00ce2ee27edf39037e7836ad580eb3350; from c5665868183fec689dbab9fb8505188b2c4f0757 before 08f70be5e406ce47c822f2dd11c1170ca259605b; from c5665868183fec689dbab9fb8505188b2c4f0757 before a181b228b37a6a5625dad2bb4265bb7abb673e9f; and 1 more ranges | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.4 before 5.4.297; from 5.5 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.43; from 6.13 before 6.15.11; from 6.16 before 6.16.2; and 1 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682apatch
- https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334patch
- https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390bpatch
- https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dacpatch
- https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265dpatch
- https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350patch
- https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605bpatch
- https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9fpatch
- https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlmailing-list, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlmailing-list, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.