CVE-2025-40179

ext4: verify orphan file size is not too big

State: Published
Severity: Not scored
Published: Nov 12, 2025
Updated: May 11, 2026
Reserved: Apr 16, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

ext4: verify orphan file size is not too big

In principle orphan file can be arbitrarily large. However orphan replay needs to traverse it all and we also pin all its buffers in memory. Thus filesystems with absurdly large orphan files can lead to big amounts of memory consumed. Limit orphan file size to a sane value and also use kvmalloc() for allocating array of block descriptor structures to avoid large order allocations for sane but large orphan files.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 95a21611b14ae0a401720645245a8db16f040995Affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 566a1d6084563bd07433025aa23bcea4427de107Affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 304fc34ff6fc8261138fd81f119e024ac3a129e9Affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before a2d803fab8a6c6a874277cb80156dc114db91921Affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 2b9da798ff0f4d026c5f0f815047393ebe7d8859Affected 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 0a6ce20c156442a4ce2a404747bb0fb05d54eeb3Affected
LinuxLinux	5.15Affected before 5.15Not affected 5.15.195 through 5.15.Not affected 6.1.157 through 6.1.Not affected 6.6.113 through 6.6.Not affected 6.12.54 through 6.12.Not affected 6.17.4 through 6.17.*Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 95a21611b14ae0a401720645245a8db16f040995Affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 566a1d6084563bd07433025aa23bcea4427de107Affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 304fc34ff6fc8261138fd81f119e024ac3a129e9Affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before a2d803fab8a6c6a874277cb80156dc114db91921Affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 2b9da798ff0f4d026c5f0f815047393ebe7d8859Affected
02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 to before 0a6ce20c156442a4ce2a404747bb0fb05d54eeb3Affected

LinuxLinux

5.15Affected
before 5.15Not affected
5.15.195 through 5.15.*Not affected
6.1.157 through 6.1.*Not affected
6.6.113 through 6.6.*Not affected
6.12.54 through 6.12.*Not affected
6.17.4 through 6.17.*Not affected
6.18 and laterNot affected

References

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