# CVE-2022-49766: netlink: Bounds-check struct nlmsgerr creation

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

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

netlink: Bounds-check struct nlmsgerr creation

In preparation for FORTIFY_SOURCE doing bounds-check on memcpy(),
switch from __nlmsg_put to nlmsg_put(), and explain the bounds check
for dealing with the memcpy() across a composite flexible array struct.
Avoids this future run-time warning:

  memcpy: detected field-spanning write (size 32) of single field "&errmsg->msg" at net/netlink/af_netlink.c:2447 (size 16)

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < aff4eb16f589c3af322a2582044bca365381fcd6 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 710d21fdff9a98d621cd4e64167f3ef8af4e2fd1 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.12 (affected); ≥ 0; < 2.6.12 (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/aff4eb16f589c3af322a2582044bca365381fcd6 (CNA: Linux)

- https://git.kernel.org/stable/c/710d21fdff9a98d621cd4e64167f3ef8af4e2fd1 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49766; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49766; retrieved 2026-11-05; source updated Not reported

Revision: 3b99f340870bf4bdeb417e4fc4d07bb42497866f48b73ed85b6d800fe0b7b77d

Canonical: https://y2.dev/cve/CVE-2022-49766

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