CVE-2026-72164

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: avoid moving extents to occupied clusters For non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical me_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and expects ocfs2_probe_alloc_group() to replace it with a free run in the target block group. The probe currently leaves *phys_cpos unchanged if the scan reaches the end of the group without finding a free run. An occupied goal at the last bit can therefore survive the probe and be passed to __ocfs2_move_extent(), which copies file data into a cluster still owned by another inode before the bitmap is updated. When the probe does find a free run, it also subtracts move_len from the ending bit. The start of an N-bit run ending at i is i - N + 1, so the current calculation can report the bit immediately before the free run. Clear *phys_cpos before scanning and use the correct free-run start. Callers already treat a zero result as -ENOSPC, so failed probes no longer continue with an occupied caller-controlled goal.

Gravité et risque d'exploitation

CVE-2026-72164 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.8 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, 3.0, <=6.12.*, <d5d5a21fb33cd9b963aea99da81e4dacd452cd95, <3112afebf2a76e522fbaabcbb0c47aafbdc35932, 0, <19f7b04924b20b81dabbeed19d5542792ba5b6d6, <=7.1.*, <e281d892ce5870a50fdc718cb3bfc3dd5b62c728, 6.1.178, <=5.10.*, e6b5859cccfa0fec02f3c5b1069481efc7186f47, <=6.6.*, 6.12.97, <35486b291b8fbde6c4d0b1c79e565c6260d3329d, <0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e, <=6.18.*, 5.15.212, 6.6.145, <4d1953d3aeb4a7f6623083e1839068ee1c157db2, 5.10.261, <3.0, <=*, <22920541c35a9f23f219038ba5874c843a7c4419, <=5.15.*, 7.2) 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

• https://git.kernel.org/stable/c/3112afebf2a76e522fbaabcbb0c47aafbdc35932
• https://git.kernel.org/stable/c/35486b291b8fbde6c4d0b1c79e565c6260d3329d
• https://git.kernel.org/stable/c/19f7b04924b20b81dabbeed19d5542792ba5b6d6
• https://git.kernel.org/stable/c/e281d892ce5870a50fdc718cb3bfc3dd5b62c728
• https://git.kernel.org/stable/c/0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e
• https://git.kernel.org/stable/c/d5d5a21fb33cd9b963aea99da81e4dacd452cd95
• https://git.kernel.org/stable/c/4d1953d3aeb4a7f6623083e1839068ee1c157db2
• https://git.kernel.org/stable/c/22920541c35a9f23f219038ba5874c843a7c4419