# CVE-2022-49795: rethook: fix a potential memleak in rethook_alloc()

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

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

rethook: fix a potential memleak in rethook_alloc()

In rethook_alloc(), the variable rh is not freed or passed out
if handler is NULL, which could lead to a memleak, fix it.

[Masami: Add "rethook:" tag to the title.]

Acke-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 54ecbe6f1ed5138c895bdff55608cf502755b20e; < cbc5d1f9a8cc40ba2bc6779b36d2ea1f65bc027c (affected, git); ≥ 54ecbe6f1ed5138c895bdff55608cf502755b20e; < 0a1ebe35cb3b7aa1f4b26b37e2a0b9ae68dc4ffb (affected, git). Source: CNA: Linux
- Linux / Linux: 5.18 (affected); ≥ 0; < 5.18 (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 6.47%

- 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/cbc5d1f9a8cc40ba2bc6779b36d2ea1f65bc027c (CNA: Linux)

- https://git.kernel.org/stable/c/0a1ebe35cb3b7aa1f4b26b37e2a0b9ae68dc4ffb (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49795; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49795; retrieved 2026-11-05; source updated Not reported

Revision: dad3d9465ab0d521841b7077b53094bd1005633748542c0d7c04833636c2fa0b

Canonical: https://y2.dev/cve/CVE-2022-49795

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