What’s Vulnerable › Vulnerabilities

CVE-2021-46923: fs/mount_setattr: always cleanup mount_kattr

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-02-27 · updated 2026-06-17
• Weakness: CWE-668

Description

In the Linux kernel, the following vulnerability has been resolved: fs/mount_setattr: always cleanup mount_kattr Make sure that finish_mount_kattr() is called after mount_kattr was succesfully built in both the success and failure case to prevent leaking any references we took when we built it. We returned early if path lookup failed thereby risking to leak an additional reference we took when building mount_kattr when an idmapped mount was requested.

Affected products

• Linux kernel: from 5.12.0 before 5.15.13 — fixed in 5.15.13

How to fix

Upgrade to a fixed version: Linux kernel 5.15.13. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/012e332286e2bb9f6ac77d195f17e74b2963d663
• https://git.kernel.org/stable/c/47b5d0a7532d39e42a938f81e3904268145c341d
• https://git.kernel.org/stable/c/012e332286e2bb9f6ac77d195f17e74b2963d663
• https://git.kernel.org/stable/c/47b5d0a7532d39e42a938f81e3904268145c341d

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