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CVE-2026-74595

7.8 · HIGH

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_…

Published Aug 22, 2026EPSS 0.09%

Overview

CVE-2026-74595 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0baeb730044981f5ec5fb7d62a3763835ea606f6Refgit.kernel.org/stable/c/174633a468817a49bd474bcfc9067c84e54efe68Refgit.kernel.org/stable/c/33b7e810ce09955aa02f3b632455cf5e7ac990a9Refgit.kernel.org/stable/c/653e888a24c87b8bbeab44d7e558a1c1a3641088Refgit.kernel.org/stable/c/6a67c460b12315033268dce597546984fe5739e7Refgit.kernel.org/stable/c/98516ba8b817f34e86bdd7a5b7a383cff75c3ddfRefgit.kernel.org/stable/c/cf6c993c0feca7984797e634deba3c80342e199a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74595?

CVE-2026-74595 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74595?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74595?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74595?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74595 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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