CVE-2026-74595

fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy()

State: Published
Severity: 7.8 High
Published: Aug 22, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

Description

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

fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy()

fscrypt_ioctl_set_policy() calls inode_owner_or_capable() with &nop_mnt_idmap before allowing an encryption policy to be set, instead of the idmap of the mount the ioctl was issued on.

fscrypt is used by filesystems that support idmapped mounts (e.g. ext4, f2fs), so on such a mount this compares the caller's fsuid against the unmapped on-disk owner rather than the mapped owner: the actual owner can be wrongly denied with -EACCES and an unrelated caller wrongly allowed. Use file_mnt_idmap(filp) instead.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 174633a468817a49bd474bcfc9067c84e54efe68Affected 14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 0baeb730044981f5ec5fb7d62a3763835ea606f6Affected 14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 33b7e810ce09955aa02f3b632455cf5e7ac990a9Affected 14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 6a67c460b12315033268dce597546984fe5739e7Affected 14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 653e888a24c87b8bbeab44d7e558a1c1a3641088Affected 14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 98516ba8b817f34e86bdd7a5b7a383cff75c3ddfAffected 14f3db5542e62bcf6fe088a09760ac52d55306c5 to before cf6c993c0feca7984797e634deba3c80342e199aAffected
LinuxLinux	5.12Affected before 5.12Not affected 5.15.217 through 5.15.Not affected 6.1.184 through 6.1.Not affected 6.6.152 through 6.6.Not affected 6.12.104 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 174633a468817a49bd474bcfc9067c84e54efe68Affected
14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 0baeb730044981f5ec5fb7d62a3763835ea606f6Affected
14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 33b7e810ce09955aa02f3b632455cf5e7ac990a9Affected
14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 6a67c460b12315033268dce597546984fe5739e7Affected
14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 653e888a24c87b8bbeab44d7e558a1c1a3641088Affected
14f3db5542e62bcf6fe088a09760ac52d55306c5 to before 98516ba8b817f34e86bdd7a5b7a383cff75c3ddfAffected
14f3db5542e62bcf6fe088a09760ac52d55306c5 to before cf6c993c0feca7984797e634deba3c80342e199aAffected

LinuxLinux

5.12Affected
before 5.12Not affected
5.15.217 through 5.15.*Not affected
6.1.184 through 6.1.*Not affected
6.6.152 through 6.6.*Not affected
6.12.104 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.