In the Linux kernel, the following vulnerability has been resolved: fscrypt: use the mount idmap for the owner check in fscrypt_ioctl_se…
CVE-2026-74595 · published 22 Aug 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74595?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 5.12
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/0baeb730044981f5ec5fb7d62a3763835ea606f6
- git.kernel.org/stable/c/174633a468817a49bd474bcfc9067c84e54efe68
- git.kernel.org/stable/c/33b7e810ce09955aa02f3b632455cf5e7ac990a9
- git.kernel.org/stable/c/653e888a24c87b8bbeab44d7e558a1c1a3641088
- git.kernel.org/stable/c/6a67c460b12315033268dce597546984fe5739e7
- git.kernel.org/stable/c/98516ba8b817f34e86bdd7a5b7a383cff75c3ddf
- git.kernel.org/stable/c/cf6c993c0feca7984797e634deba3c80342e199a
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON