CVE-2026-89593
7.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < a3c65af20cceb7f997847727636b4017326f845d | affected |
| Linux | Linux | df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < 0f001491e5a2ec69aa9d5dd6b799e5742245f9ea | affected |
| Linux | Linux | df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < 5120b1e048d48596ffaec1a8412012a91adba73b | affected |
| Linux | Linux | 6.9 | affected |
| Linux | Linux | 0 < 6.9 | unaffected |
| Linux | Linux | 6.18.50 <= 6.18.* | unaffected |
| Linux | Linux | 7.2.4 <= 7.2.* | unaffected |
| Linux | Linux | 7.3-rc1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/a3c65af20cceb7f997847727636b4017326f845d
- https://git.kernel.org/stable/c/0f001491e5a2ec69aa9d5dd6b799e5742245f9ea
- https://git.kernel.org/stable/c/5120b1e048d48596ffaec1a8412012a91adba73b
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