CVE-2026-64244drivers/base/memory: set mem->altmap after successful device registration
- 5.5MediumCVSS base score
- 0.11%Exploitation in 30 daysEPSS · top 98% 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: drivers/base/memory: set mem->altmap after successful device registration If __add_memory_block() fails at xa_store() (under memory pressure for example), device_unregister() is called, which eventually triggers memory_block_release() with mem->altmap still set, causing a WARN_ON(mem->altmap). This was triggered by modifying virtio-mem driver. Fix this by delaying the assignment of mem->altmap until after __add_memory_block() has succeeded.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 4 months later
· 4 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 | 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)
- 0.11% · top 98% of all CVEs (15 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 1a8c64e110435e44e71bcd50a75663174b575f22 – < 802e113cf120df7208e4c7e604950a85e87120a8
- affected 1a8c64e110435e44e71bcd50a75663174b575f22 – < 22dc0d042f02ce82aa61422ea5f232628bfd9e9c
- affected 1a8c64e110435e44e71bcd50a75663174b575f22 – < 6c25bf4e44a2b6a14332f952bba0974521f5b72d
- affected 1a8c64e110435e44e71bcd50a75663174b575f22 – < bc3dd82a0ffd488bb902f4c69c3d28fd4088d973
- affected 1a8c64e110435e44e71bcd50a75663174b575f22 – < 059ac6252a63edf1cea79bf30bd860a8c264b62c
- affected 1a8c64e110435e44e71bcd50a75663174b575f22 – < a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a
- affected 6.6
- unaffected < 6.6
- unaffected 6.6.144 – ≤ 6.6.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.37 – ≤ 6.18.*
- unaffected 7.0.14 – ≤ 7.0.*
- unaffected 7.1.2 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8 (opens in a new tab)
- https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c (opens in a new tab)
- https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d (opens in a new tab)
- https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973 (opens in a new tab)
- https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c (opens in a new tab)
- https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a (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-2026-48653 (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-2026-64244)Record last updated .