What’s Vulnerable › Vulnerabilities

CVE-2023-54128: fs: drop peer group ids under namespace lock

• Severity: high (CVSS 7.8 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: 2025-12-24 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: fs: drop peer group ids under namespace lock When cleaning up peer group ids in the failure path we need to make sure to hold on to the namespace lock. Otherwise another thread might just turn the mount from a shared into a non-shared mount concurrently.

Affected products

• Linux kernel: 5.12 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0af8fae81d8b7f1beddc17c5d4cfa43235134648
• https://git.kernel.org/stable/c/65c324d3f35c05e37afec39ac80743583fdcc96c
• https://git.kernel.org/stable/c/cb2239c198ad9fbd5aced22cf93e45562da781eb
• https://git.kernel.org/stable/c/ddca03d97daa7b07b60c52e3d3060762732c6666

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