# CVE-2022-49786: blk-cgroup: properly pin the parent in blkcg_css_online

Status: published. Published: 2025-05-01. Updated: 2026-11-05.

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

blk-cgroup: properly pin the parent in blkcg_css_online

blkcg_css_online is supposed to pin the blkcg of the parent, but
397c9f46ee4d refactored things and along the way, changed it to pin the
css instead.  This results in extra pins, and we end up leaking blkcgs
and cgroups.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 397c9f46ee4d99024c64954b007c1b5762d01cb4; < d118247e404d6338f7b90636a3c6b95a387ed163 (affected, git); ≥ 397c9f46ee4d99024c64954b007c1b5762d01cb4; < d7dbd43f4a828fa1d9a8614d5b0ac40aee6375fe (affected, git). Source: CNA: Linux
- Linux / Linux: 5.19 (affected); ≥ 0; < 5.19 (unaffected, semver); ≥ 6.0.10; ≤ 6.0.* (unaffected, semver); ≥ 6.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.17% as of 2026-11-05; percentile 6.44%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/d118247e404d6338f7b90636a3c6b95a387ed163 (CNA: Linux)

- https://git.kernel.org/stable/c/d7dbd43f4a828fa1d9a8614d5b0ac40aee6375fe (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49786; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49786; retrieved 2026-11-05; source updated Not reported

Revision: 86f39b23891940dfbd097f54dc4a9db0070b115b48b3795a14c2aadfeac3a834

Canonical: https://y2.dev/cve/CVE-2022-49786

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