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CVE-2026-53043

Vulnérabilité critique dans Linux (Linux)

CVSS 9.1 · Critique
EPSS 0.5%
Linux•Linux•Versions : <1f8b91275912cd428289c1fb424bebd7ff5302bd, <=6.1.*, <=7.0.*, <=6.12.*, 2.6.37, <3f474c33ebc2e2ca3fcb587d7de4375348f13373, <2.6.37, 0, <6c6e8fc3c007319981647b410c29bb5775048551, 6.18.33, <3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21, <f37de46149db49abd2b24f4f0c5a88cf4dfb5f47, 5.15.209, <d3d5efade0c79dac1cac98c0cb1115432f804439, <=5.10.*, <=6.6.*, 6.12.91, 6.1.175, 6.6.141, 7.1, <=6.18.*, 7.0.10, 5.10.258, <=*, <7ab3fbb01bc6d79091bc375e5235d360cd9b78be, <=5.15.*, ea2034416b54700e30371f2ad6517cbb94674083, <f69551139caf6d24242a0ad049ee46b264e3aee0

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: validate qr_numregions in dlm_match_regions() Patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()". In dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION network message is used to drive loops over the qr_regions buffer without sufficient validation. This series fixes two issues: - Patch 1 adds a bounds check to reject messages where qr_numregions exceeds O2NM_MAX_REGIONS. The o2net layer only validates message byte length; it does not constrain field values, so a crafted message can set qr_numregions up to 255 and trigger out-of-bounds reads past the 1024-byte qr_regions buffer. - Patch 2 fixes an off-by-one in the local-vs-remote comparison loop, which uses '<=' instead of '<', reading one entry past the valid range even when qr_numregions is within bounds. This patch (of 2): The qr_numregions field from a DLM_QUERY_REGION network message is used directly as loop bounds in dlm_match_regions() without checking against O2NM_MAX_REGIONS. Since qr_regions is sized for at most O2NM_MAX_REGIONS (32) entries, a crafted message with qr_numregions > 32 causes out-of-bounds reads past the qr_regions buffer. Add a bounds check for qr_numregions before entering the loops.

Gravité et risque d'exploitation

CVE-2026-53043 obtient un score CVSS de 9.1/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.51 %, ce qui la place devant 42.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <1f8b91275912cd428289c1fb424bebd7ff5302bd, <=6.1.*, <=7.0.*, <=6.12.*, 2.6.37, <3f474c33ebc2e2ca3fcb587d7de4375348f13373, <2.6.37, 0, <6c6e8fc3c007319981647b410c29bb5775048551, 6.18.33, <3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21, <f37de46149db49abd2b24f4f0c5a88cf4dfb5f47, 5.15.209, <d3d5efade0c79dac1cac98c0cb1115432f804439, <=5.10.*, <=6.6.*, 6.12.91, 6.1.175, 6.6.141, 7.1, <=6.18.*, 7.0.10, 5.10.258, <=*, <7ab3fbb01bc6d79091bc375e5235d360cd9b78be, <=5.15.*, ea2034416b54700e30371f2ad6517cbb94674083, <f69551139caf6d24242a0ad049ee46b264e3aee0) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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