CVE-2026-74595
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.09% probability · 1th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0baeb730044981f5ec5fb7d62a3763835ea606f6
- https://git.kernel.org/stable/c/174633a468817a49bd474bcfc9067c84e54efe68
- https://git.kernel.org/stable/c/33b7e810ce09955aa02f3b632455cf5e7ac990a9
- https://git.kernel.org/stable/c/653e888a24c87b8bbeab44d7e558a1c1a3641088
- https://git.kernel.org/stable/c/6a67c460b12315033268dce597546984fe5739e7
- https://git.kernel.org/stable/c/98516ba8b817f34e86bdd7a5b7a383cff75c3ddf
- https://git.kernel.org/stable/c/cf6c993c0feca7984797e634deba3c80342e199a
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.