# CVE-2026-43463: rxrpc, afs: Fix missing error pointer check after rxrpc_kernel_lookup_peer()

Status: published. Published: 2026-05-08. Updated: 2026-11-06.

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

rxrpc, afs: Fix missing error pointer check after rxrpc_kernel_lookup_peer()

rxrpc_kernel_lookup_peer() can also return error pointers in addition to
NULL, so just checking for NULL is not sufficient.

Fix this by:

 (1) Changing rxrpc_kernel_lookup_peer() to return -ENOMEM rather than NULL
     on allocation failure.

 (2) Making the callers in afs use IS_ERR() and PTR_ERR() to pass on the
     error code returned.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 72904d7b9bfbf2dd146254edea93958bc35bbbfe; < d854c93b12f2076c564f595b41b93b02fd42a0f9 (affected, git); ≥ 72904d7b9bfbf2dd146254edea93958bc35bbbfe; < d55fa7cd4b19ba91b34b307d769c149e56ad0a75 (affected, git); ≥ 72904d7b9bfbf2dd146254edea93958bc35bbbfe; < 54331c5dcc6d97683d7ca2788e7ef9c9505e1477 (affected, git); ≥ 72904d7b9bfbf2dd146254edea93958bc35bbbfe; < 4245a79003adf30e67f8e9060915bd05cb31d142 (affected, git); 056fc740be000d39a7dba700a935f3bbfbc664e6 (affected, git); ≥ 6.7.3; < 6.8 (affected, semver). Source: CNA: Linux
- Linux / Linux: 6.8 (affected); ≥ 0; < 6.8 (unaffected, semver); ≥ 6.12.114; ≤ 6.12.* (unaffected, semver); ≥ 6.18.19; ≤ 6.18.* (unaffected, semver); ≥ 6.19.9; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.11% as of 2026-11-06; percentile 1.49%

- 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/d854c93b12f2076c564f595b41b93b02fd42a0f9 (CNA: Linux)

- https://git.kernel.org/stable/c/d55fa7cd4b19ba91b34b307d769c149e56ad0a75 (CNA: Linux)

- https://git.kernel.org/stable/c/54331c5dcc6d97683d7ca2788e7ef9c9505e1477 (CNA: Linux)

- https://git.kernel.org/stable/c/4245a79003adf30e67f8e9060915bd05cb31d142 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-43463; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-43463; retrieved 2026-11-06; source updated Not reported

Revision: 293b78624cc59b25bf442af1cb2cf1e1a06619d2c48b28f59a50f5245a868936

Canonical: https://y2.dev/cve/CVE-2026-43463

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