What’s Vulnerable › Vulnerabilities

CVE-2026-74595: fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_set_policy()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-16

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.

Affected products

• Linux kernel: 5.12 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

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

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