CVE-2026-89593High· 7.1▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 4.7
none → medium
— → 7.1
none → high
7.1 → 4.7
high → medium
4.7 → 7.1
medium → high
0.2% → 0.2%
7.1 → 5.5
high → medium
Last analysed / modified upstream
5.5 → 7.1
medium → high
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.
Linux >= df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < b0b1b9ca80b795ed2223e76dd787db7067121fb9Linux >= df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < a3c65af20cceb7f997847727636b4017326f845dLinux >= df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < 0f001491e5a2ec69aa9d5dd6b799e5742245f9eaLinux >= df7a6d1f64056aec572162c5d35ed9ff86ece6f3 < 5120b1e048d48596ffaec1a8412012a91adba73bLinux 6.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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