CVE-2026-89593

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Source

https://cve.org/CVERecord?id=CVE-2026-89593

Import Source

https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-89593.json

JSON Data

https://api.test.osv.dev/v1/vulns/CVE-2026-89593

Downstream

Related

openSUSE-SU-2026:11805-1

Published

2026-09-11T19:44:56Z

Modified

2026-09-18T18:26:39Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H CVSS Calculator

Summary

hugetlb: only adjust reservation during unmapping if mapcount is 0

Details

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.

Database specific

{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89593.json"
}

References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

df7a6d1f64056aec572162c5d35ed9ff86ece6f3

Fixed

b0b1b9ca80b795ed2223e76dd787db7067121fb9

Fixed

a3c65af20cceb7f997847727636b4017326f845d

Fixed

0f001491e5a2ec69aa9d5dd6b799e5742245f9ea

Fixed

5120b1e048d48596ffaec1a8412012a91adba73b

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-89593.json"

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

6.9.0

Fixed

6.12.110

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.18.50

Type: ECOSYSTEM
Events: Introduced

6.19.0

Fixed

7.2.4

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-89593.json"