CVE-2025-38008mm/page_alloc: fix race condition in unaccepted memory handling
- 4.7MediumCVSS 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/page_alloc: fix race condition in unaccepted memory handling The page allocator tracks the number of zones that have unaccepted memory using static_branch_enc/dec() and uses that static branch in hot paths to determine if it needs to deal with unaccepted memory. Borislav and Thomas pointed out that the tracking is racy: operations on static_branch are not serialized against adding/removing unaccepted pages to/from the zone. Sanity checks inside static_branch machinery detects it: WARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0 The comment around the WARN() explains the problem: /* * Warn about the '-1' case though; since that means a * decrement is concurrent with a first (0->1) increment. IOW * people are trying to disable something that wasn't yet fully * enabled. This suggests an ordering problem on the user side. */ The effect of this static_branch optimization is only visible on microbenchmark. Instead of adding more complexity around it, remove it altogether.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 11 months later
· 11 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 · Analyzed | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.7.
Affected products
- affected dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 – < 98fdd2f612e949c652693f6df00442c81037776d
- affected dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 – < 74953f93f47a45296cc2a3fd04e2a3202ff3fa53
- affected dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 – < 71dda1cb10702dc2859f00eb789b0502de2176a9
- affected dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6 – < fefc075182275057ce607effaa3daa9e6e3bdc73
- affected 6.5
- unaffected < 6.5
- unaffected 6.6.92 – ≤ 6.6.*
- unaffected 6.12.30 – ≤ 6.12.*
- unaffected 6.14.8 – ≤ 6.14.*
- unaffected 6.15 – ≤ *
References
References4
- https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d (opens in a new tab)
- https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53 (opens in a new tab)
- https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9 (opens in a new tab)
- https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73 (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-2025-27861 (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-2025-38008)Record last updated .