mm: avoid leaving partial pfn mappings around in error case (Linux Linux)

CVE-2024-47674
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.25 % · centile 16 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: mm: avoid leaving partial pfn mappings around in error case As Jann points out, PFN mappings are special, because unlike normal memory mappings, there is no lifetime information associated with the mapping - it is just a raw mapping of PFNs with no reference counting of a 'struct page'. That's all very much intentional, but it does mean that it's easy to mess up the cleanup in case of errors. Yes, a failed mmap() will always eventually clean up any partial mappings, but without any explicit lifetime in the page table mapping itself, it's very easy to do the error handling in the wrong order. In particular, it's easy to mistakenly free the physical backing store before the page tables are actually cleaned up and (temporarily) have stale dangling PTE entries. To make this situation less error-prone, just make sure that any partial pfn mapping is torn down early, before any other error handling.

Faiblesses (CWE)

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 5.5CVSS:3.1/AV:L/AC:L/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 b97a50adb37e98b940a30c4656565ff609aa8f94 < 3213fdcab961026203dd587a4533600c70b3336b ; affected 69d4e1ce9087c8767f2fe9b9426fa2755c8e9072 < 35770ca6180caa24a2b258c99a87bd437a1ee10f ; affected 74ffa5a3e68504dd289135b1cf0422c19ffb3f2e < 5b2c8b34f6d76bfbd1dd4936eb8a0fbfb9af3959 ; affected 74ffa5a3e68504dd289135b1cf0422c19ffb3f2e < 65d0db500d7c07f0f76fc24a4d837791c4862cd2 ; affected 74ffa5a3e68504dd289135b1cf0422c19ffb3f2e < a95a24fcaee1b892e47d5e6dcc403f713874ee80 ; affected 74ffa5a3e68504dd289135b1cf0422c19ffb3f2e < 954fd4c81f22c4b6ba65379a81fd252971bf4ef3
Linux · Linuxaffected 5.13 ; unaffected 0 < 5.13 ; unaffected 5.15.168 ≤ 5.15.* ; unaffected 6.1.111 ≤ 6.1.* ; unaffected 6.6.52 ≤ 6.6.* ; unaffected 6.10.11 ≤ 6.10.*

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