Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 before b0b1b9ca80b795ed2223e76dd787db7067121fb9; affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 before a3c65af20cceb7f997847727636b4017326f845d; affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 before 0f001491e5a2ec69aa9d5dd6b799e5742245f9ea; affected df7a6d1f64056aec572162c5d35ed9ff86ece6f3 before 5120b1e048d48596ffaec1a8412012a91adba73b |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.12.110 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.