CVE-2025-39736mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock
- 5.5MediumCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 5 months later
· 5 months later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < c7b6ea0ede687e7460e593c5ea478f50aa41682a
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < 4b0151e1d468eb2667c37b7af99b3c075072d334
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < f249d32bb54876b4b6c3ae071af8ddca77af390b
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < 62879faa8efe8d8a9c7bf7606ee9c068012d7dac
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < 1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < a0854de00ce2ee27edf39037e7836ad580eb3350
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < 08f70be5e406ce47c822f2dd11c1170ca259605b
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < a181b228b37a6a5625dad2bb4265bb7abb673e9f
- affected c5665868183fec689dbab9fb8505188b2c4f0757 – < 47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2
- affected 5.4
- unaffected < 5.4
- unaffected 5.4.297 – ≤ 5.4.*
- unaffected 5.10.241 – ≤ 5.10.*
- unaffected 5.15.190 – ≤ 5.15.*
- unaffected 6.1.149 – ≤ 6.1.*
- unaffected 6.6.103 – ≤ 6.6.*
- unaffected 6.12.43 – ≤ 6.12.*
- unaffected 6.15.11 – ≤ 6.15.*
- unaffected 6.16.2 – ≤ 6.16.*
- unaffected 6.17 – ≤ *
References
References12
- https://git.kernel.org/stable/c/c7b6ea0ede687e7460e593c5ea478f50aa41682a (opens in a new tab)
- https://git.kernel.org/stable/c/4b0151e1d468eb2667c37b7af99b3c075072d334 (opens in a new tab)
- https://git.kernel.org/stable/c/f249d32bb54876b4b6c3ae071af8ddca77af390b (opens in a new tab)
- https://git.kernel.org/stable/c/62879faa8efe8d8a9c7bf7606ee9c068012d7dac (opens in a new tab)
- https://git.kernel.org/stable/c/1da95d3d4b7b1d380ebd87b71a61e7e6aed3265d (opens in a new tab)
- https://git.kernel.org/stable/c/a0854de00ce2ee27edf39037e7836ad580eb3350 (opens in a new tab)
- https://git.kernel.org/stable/c/08f70be5e406ce47c822f2dd11c1170ca259605b (opens in a new tab)
- https://git.kernel.org/stable/c/a181b228b37a6a5625dad2bb4265bb7abb673e9f (opens in a new tab)
- https://git.kernel.org/stable/c/47b0f6d8f0d2be4d311a49e13d2fd5f152f492b2 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-28975 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-39736)Record last updated .