CVE-2025-39737mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()
- 5.5MediumCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% 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 soft lockup in __kmemleak_do_cleanup() A soft lockup warning was observed on a relative small system x86-64 system with 16 GB of memory when running a debug kernel with kmemleak enabled. watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134] The test system was running a workload with hot unplug happening in parallel. Then kemleak decided to disable itself due to its inability to allocate more kmemleak objects. The debug kernel has its CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000. The soft lockup happened in kmemleak_do_cleanup() when the existing kmemleak objects were being removed and deleted one-by-one in a loop via a workqueue. In this particular case, there are at least 40,000 objects that need to be processed and given the slowness of a debug kernel and the fact that a raw_spinlock has to be acquired and released in __delete_object(), it could take a while to properly handle all these objects. As kmemleak has been disabled in this case, the object removal and deletion process can be further optimized as locking isn't really needed. However, it is probably not worth the effort to optimize for such an edge case that should rarely happen. So the simple solution is to call cond_resched() at periodic interval in the iteration loop to avoid soft lockup.
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)
- 0.18% · top 92% 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 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < 9f1f4e95031f84867c5821540466d62f88dab8ca
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < 1ef72a7fedc5bca70e8cc980985790de10d407aa
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < a04de4c40aab9b338dfa989cf4aec70fd187eeb2
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < f014c10d190b92aad366e56b445daffcd1c075e4
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < 8d2d22a55ffe35c38e69795468a7addd1a80e9ce
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < 926092268efdf1ed7b55cf486356c74a9e7710d1
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < 9b80430c194e4a114dc663c1025d56b4f3d0153d
- affected 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 – < d1534ae23c2b6be350c8ab060803fbf6e9682adc
- 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/9f1f4e95031f84867c5821540466d62f88dab8ca (opens in a new tab)
- https://git.kernel.org/stable/c/1ef72a7fedc5bca70e8cc980985790de10d407aa (opens in a new tab)
- https://git.kernel.org/stable/c/a04de4c40aab9b338dfa989cf4aec70fd187eeb2 (opens in a new tab)
- https://git.kernel.org/stable/c/f014c10d190b92aad366e56b445daffcd1c075e4 (opens in a new tab)
- https://git.kernel.org/stable/c/e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b (opens in a new tab)
- https://git.kernel.org/stable/c/8d2d22a55ffe35c38e69795468a7addd1a80e9ce (opens in a new tab)
- https://git.kernel.org/stable/c/926092268efdf1ed7b55cf486356c74a9e7710d1 (opens in a new tab)
- https://git.kernel.org/stable/c/9b80430c194e4a114dc663c1025d56b4f3d0153d (opens in a new tab)
- https://git.kernel.org/stable/c/d1534ae23c2b6be350c8ab060803fbf6e9682adc (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-2025-28974 (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-2025-39737)Record last updated .