- 7.1HighCVSS base score
- 0.13%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: hugetlb: only adjust reservation during unmapping if mapcount is 0 Since df7a6d1f6405, __unmap_hugepage_range can adjust reservations. In the case of folio mapped in both a parent and a child, if the parent unmaps the range first, the reservation adjustment will result in an underflow of the reserved count. Once the child unmaps the range, the count is restored. Change __unmap_hugepage_range() to check the mapcount before adjusting the reservation.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 – < b0b1b9ca80b795ed2223e76dd787db7067121fb9
- affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 – < a3c65af20cceb7f997847727636b4017326f845d
- affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 – < 0f001491e5a2ec69aa9d5dd6b799e5742245f9ea
- affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 – < 5120b1e048d48596ffaec1a8412012a91adba73b
- affected 6.9
- unaffected < 6.9
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/b0b1b9ca80b795ed2223e76dd787db7067121fb9 (opens in a new tab)
- https://git.kernel.org/stable/c/a3c65af20cceb7f997847727636b4017326f845d (opens in a new tab)
- https://git.kernel.org/stable/c/0f001491e5a2ec69aa9d5dd6b799e5742245f9ea (opens in a new tab)
- https://git.kernel.org/stable/c/5120b1e048d48596ffaec1a8412012a91adba73b (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-2026-76505 (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-2026-89593)Record last updated .