mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race (Linux Linux)

CVE-2025-38085
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.16 % · centile 5 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race huge_pmd_unshare() drops a reference on a page table that may have previously been shared across processes, potentially turning it into a normal page table used in another process in which unrelated VMAs can afterwards be installed. If this happens in the middle of a concurrent gup_fast(), gup_fast() could end up walking the page tables of another process. While I don't see any way in which that immediately leads to kernel memory corruption, it is really weird and unexpected. Fix it with an explicit broadcast IPI through tlb_remove_table_sync_one(), just like we do in khugepaged when removing page tables for a THP collapse.

Faiblesses (CWE)

  • CWE-362 — Situation de compétition

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1MEDIUM 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa < 952596b08c74e8fe9e2883d1dc8a8f54a37384ec ; affected 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa < a3d864c901a300c295692d129159fc3001a56185 ; affected 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa < b7754d3aa7bf9f62218d096c0c8f6c13698fac8b ; affected 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa < fe684290418ef9ef76630072086ee530b92f02b8 ; affected 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa < 034a52b5ef57c9c8225d94e9067f3390bb33922f ; affected 39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa < a6bfeb97941a9187833b526bc6cc4ff5706d0ce9
Linux · Linuxaffected 2.6.20 ; unaffected 0 < 2.6.20 ; unaffected 5.10.239 ≤ 5.10.* ; unaffected 5.15.186 ≤ 5.15.* ; unaffected 6.1.142 ≤ 6.1.* ; unaffected 6.6.95 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD