CVE-2023-53055 fscrypt: destroy keyring after security_sb_delete()

What is CVE-2023-53055?

CVE-2023-53055 is a medium-severity vulnerability in Linux kernel, published on 2 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

fscrypt: destroy keyring after security_sb_delete()

fscrypt_destroy_keyring() must be called after all potentially-encrypted inodes were evicted; otherwise it cannot safely destroy the keyring. Since inodes that are in-use by the Landlock LSM don't get evicted until security_sb_delete(), this means that fscrypt_destroy_keyring() must be called *after* security_sb_delete().

This fixes a WARN_ON followed by a NULL dereference, only possible if Landlock was being used on encrypted files.

Weakness: CWE-476

Which versions are affected by CVE-2023-53055?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53055?

Apply the vendor's patch.

Is CVE-2023-53055 being exploited?

There is no known exploitation of CVE-2023-53055 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-53055, DEBIAN-CVE-2023-53055, GHSA-77x5-pwh8-3qq8, ROOT-OS-DEBIAN-11-CVE-2023-53055, UBUNTU-CVE-2023-53055.