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mm/secretmem: fix use-after-free race in fault handler (Linux Linux)

CVE-2025-40272
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.14 % · centile 4 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Deferred

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Description

In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix use-after-free race in fault handler When a page fault occurs in a secret memory file created with `memfd_secret(2)`, the kernel will allocate a new folio for it, mark the underlying page as not-present in the direct map, and add it to the file mapping. If two tasks cause a fault in the same page concurrently, both could end up allocating a folio and removing the page from the direct map, but only one would succeed in adding the folio to the file mapping. The task that failed undoes the effects of its attempt by (a) freeing the folio again and (b) putting the page back into the direct map. However, by doing these two operations in this order, the page becomes available to the allocator again before it is placed back in the direct mapping. If another task attempts to allocate the page between (a) and (b), and the kernel tries to access it via the direct map, it would result in a supervisor not-present page fault. Fix the ordering to restore the direct map before the folio is freed.

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)

Références européennes

Avis du CERT-FR

Produits affectés

ProduitVersions
Linux · Linuxaffected 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < bb1c19636aedae39360e6fdbcaef4f2bcff25785 ; affected 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 1e4643d6628edf9c0047b1f8f5bc574665025acb ; affected 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 42d486d35a4143cc37fc72ee66edc99d942dd367 ; affected 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 52f2d5cf33de9a8f5e72bbb0ed38282ae0bc4649 ; affected 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 4444767e625da46009fc94a453fd1967b80ba047 ; affected 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49 < 6f86d0534fddfbd08687fa0f01479d4226bc3c3d
Linux · Linuxaffected 5.14 ; unaffected 0 < 5.14 ; unaffected 5.15.197 ≤ 5.15.* ; unaffected 6.1.159 ≤ 6.1.* ; unaffected 6.6.117 ≤ 6.6.* ; unaffected 6.12.59 ≤ 6.12.*

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