# CVE-2026-31491: RDMA/irdma: Harden depth calculation functions

Status: published. Published: 2026-04-22. Updated: 2026-11-05.

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

RDMA/irdma: Harden depth calculation functions

An issue was exposed where OS can pass in U32_MAX for SQ/RQ/SRQ size.
This can cause integer overflow and truncation of SQ/RQ/SRQ depth
returning a success when it should have failed.

Harden the functions to do all depth calculations and boundary
checking in u64 sizes.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 563e1feb5f6ed579acb55850f1bbb831aecf645a; < 3f08351de5ca4f2f724b86ad252fbc21289467e1 (affected, git); ≥ 563e1feb5f6ed579acb55850f1bbb831aecf645a; < cbd852f5700eb3f64392452faf693ac45cae8281 (affected, git); ≥ 563e1feb5f6ed579acb55850f1bbb831aecf645a; < e37afcb56ae070477741fe2d6e61fc0c542cce2d (affected, git). Source: CNA: Linux
- Linux / Linux: 6.18 (affected); ≥ 0; < 6.18 (unaffected, semver); ≥ 6.18.21; ≤ 6.18.* (unaffected, semver); ≥ 6.19.11; ≤ 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: 0.12% as of 2026-11-05; percentile 1.90%

- 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/3f08351de5ca4f2f724b86ad252fbc21289467e1 (CNA: Linux)

- https://git.kernel.org/stable/c/cbd852f5700eb3f64392452faf693ac45cae8281 (CNA: Linux)

- https://git.kernel.org/stable/c/e37afcb56ae070477741fe2d6e61fc0c542cce2d (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-31491; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-31491; retrieved 2026-11-05; source updated Not reported

Revision: fa3535937c6f87e2adc65de92871bc15c965ef542a172fc93b4f15a4eb0824a7

Canonical: https://y2.dev/cve/CVE-2026-31491

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