CVE-2026-74595fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 14f3db5542e62bcf6fe088a09760ac52d55306c5 before 174633a468817a49bd474bcfc9067c84e54efe68; 14f3db5542e62bcf6fe088a09760ac52d55306c5 builds before 0baeb730044981f5ec5fb7d62a3763835ea606f6; from 14f3db5542e62bcf6fe088a09760ac52d55306c5 before 33b7e810ce09955aa02f3b632455cf5e7ac990a9; 14f3db5542e62bcf6fe088a09760ac52d55306c5 builds before 6a67c460b12315033268dce597546984fe5739e7; from 14f3db5542e62bcf6fe088a09760ac52d55306c5 before 653e888a24c87b8bbeab44d7e558a1c1a3641088; from 14f3db5542e62bcf6fe088a09760ac52d55306c5 before 98516ba8b817f34e86bdd7a5b7a383cff75c3ddf; from 14f3db5542e62bcf6fe088a09760ac52d55306c5 before cf6c993c0feca7984797e634deba3c80342e199a | CNA record |
References
- https://git.kernel.org/stable/c/174633a468817a49bd474bcfc9067c84e54efe68
- https://git.kernel.org/stable/c/0baeb730044981f5ec5fb7d62a3763835ea606f6
- https://git.kernel.org/stable/c/33b7e810ce09955aa02f3b632455cf5e7ac990a9
- https://git.kernel.org/stable/c/6a67c460b12315033268dce597546984fe5739e7
- https://git.kernel.org/stable/c/653e888a24c87b8bbeab44d7e558a1c1a3641088
- https://git.kernel.org/stable/c/98516ba8b817f34e86bdd7a5b7a383cff75c3ddf
- https://git.kernel.org/stable/c/cf6c993c0feca7984797e634deba3c80342e199a
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.