mm: avoid overflows in dirty throttling logic (Linux Linux)

CVE-2024-42131
MEDIUM 4.4

En bref

Source
NVD
EPSS
EPSS 0.25 % · centile 17 ()
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 overflows in dirty throttling logic The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX. This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.

Faiblesses (CWE)

  • CWE-190 — Débordement d'entier

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 4.4CVSS:3.1/AV:L/AC:L/PR:H/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 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 < 2b2d2b8766db028bd827af34075f221ae9e9efff ; affected 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 < 4d3817b64eda07491bdd86a234629fe0764fb42a ; affected 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 < 7a49389771ae7666f4dc3426e2a4594bf23ae290 ; affected 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 < a25e8536184516b55ef89ab91dd2eea429de28d2 ; affected 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 < c83ed422c24f0d4b264f89291d4fabe285f80dbc ; affected 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 < bd16a7ee339aef3ee4c90cb23902afb6af379ea0
Linux · Linuxaffected 2.6.29 ; unaffected 0 < 2.6.29 ; unaffected 4.19.320 ≤ 4.19.* ; unaffected 5.4.282 ≤ 5.4.* ; unaffected 5.10.222 ≤ 5.10.* ; unaffected 5.15.163 ≤ 5.15.*

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