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CVE-2026-45892

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <f0931a5c17005a0c4fc35bd1a001245effc3354b, <d8ee559fccdef713f058cfe5f2c03dc9b18be3b1, d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88, 1bf6974822d1dba86cf11b5f05498581cf3488a2, ddf854e59166533b0f46ba32cd6cd9aca3197d1b, <6d882ea3b0931b43530d44149b79fcd4ffc13030, <a1b962a821e7a52d48212ae269b45808b4411267, 6.1.167, <c2ee51d684adca7645e4aa74adca13f6750390bc, 7015fcf473796e1d2d876f241bd9e0c36f3d4eef, <6.1.168, d17857b4fb9ba5745b59be0ef38fd532991fccbf, 58ddae5d77b1db3a27b891c75a8fa120239ac092, <28db4bfc6f82fd20e2aadb7fc162244109a4eb31

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: drop extent cache after doing PARTIAL_VALID1 zeroout When splitting an unwritten extent in the middle and converting it to initialized in ext4_split_extent() with the EXT4_EXT_MAY_ZEROOUT and EXT4_EXT_DATA_VALID2 flags set, it could leave a stale unwritten extent. Assume we have an unwritten file and buffered write in the middle of it without dioread_nolock enabled, it will allocate blocks as written extent. 0 A B N [UUUUUUUUUUUU] on-disk extent U: unwritten extent [UUUUUUUUUUUU] extent status tree [--DDDDDDDD--] D: valid data |<- ->| ----> this range needs to be initialized ext4_split_extent() first try to split this extent at B with EXT4_EXT_DATA_PARTIAL_VALID1 and EXT4_EXT_MAY_ZEROOUT flag set, but ext4_split_extent_at() failed to split this extent due to temporary lack of space. It zeroout B to N and leave the entire extent as unwritten. 0 A B N [UUUUUUUUUUUU] on-disk extent [UUUUUUUUUUUU] extent status tree [--DDDDDDDDZZ] Z: zeroed data ext4_split_extent() then try to split this extent at A with EXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and leave an written extent from A to N. 0 A B N [UUWWWWWWWWWW] on-disk extent W: written extent [UUUUUUUUUUUU] extent status tree [--DDDDDDDDZZ] Finally ext4_map_create_blocks() only insert extent A to B to the extent status tree, and leave an stale unwritten extent in the status tree. 0 A B N [UUWWWWWWWWWW] on-disk extent W: written extent [UUWWWWWWWWUU] extent status tree [--DDDDDDDDZZ] Fix this issue by always cached extent status entry after zeroing out the second part.

Gravité et risque d'exploitation

CVE-2026-45892 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 5.1 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <f0931a5c17005a0c4fc35bd1a001245effc3354b, <d8ee559fccdef713f058cfe5f2c03dc9b18be3b1, d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88, 1bf6974822d1dba86cf11b5f05498581cf3488a2, ddf854e59166533b0f46ba32cd6cd9aca3197d1b, <6d882ea3b0931b43530d44149b79fcd4ffc13030, <a1b962a821e7a52d48212ae269b45808b4411267, 6.1.167, <c2ee51d684adca7645e4aa74adca13f6750390bc, 7015fcf473796e1d2d876f241bd9e0c36f3d4eef, <6.1.168, d17857b4fb9ba5745b59be0ef38fd532991fccbf, 58ddae5d77b1db3a27b891c75a8fa120239ac092, <28db4bfc6f82fd20e2aadb7fc162244109a4eb31) 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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