# CVE-2026-68355: wifi: ath11k: fix potential buffer underflow in ath11k_hal_rx_msdu_list_get()

Status: published. Published: 2026-08-10. Updated: 2026-11-06.

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

wifi: ath11k: fix potential buffer underflow in ath11k_hal_rx_msdu_list_get()

When the first entry in msdu_details has a zero buffer address,
the code accesses msdu_details[i - 1] with i == 0, causing a
buffer underflow.

Fix similarly to ath12k_wifi7_hal_rx_msdu_list_get() by adding
a separate check for i == 0 before the main condition to prevent
the out-of-bounds access.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 085a5fde5bac29c01059e69399b417e91c0a6c18 (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 31ea4b175bc3ab430be15834d9ee8a1ce65bee15 (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 20d18a5ec6ec364fcaf0d03af6fc43dcc42c6591 (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 69a6a4f60b2da92c0bdfd9264b8ffe053f51f52a (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 904367381a922aa2dc3e8bd2488e6c9180516c7a (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < a154ca3c441a67d36b3a9ea63a4f11b06abe6223 (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 725c1c3a8c5d920a7d3f5887412f2ad8e95a74f5 (affected, git); ≥ d5c65159f2895379e11ca13f62feabe93278985d; < 7f11e70629650ff6ea140984e5ce188b775b2683 (affected, git). Source: CNA: Linux
- Linux / Linux: 5.6 (affected); ≥ 0; < 5.6 (unaffected, semver); ≥ 5.10.265; ≤ 5.10.* (unaffected, semver); ≥ 5.15.216; ≤ 5.15.* (unaffected, semver); ≥ 6.1.183; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 7.1.6; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-06; percentile 8.10%

- 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/085a5fde5bac29c01059e69399b417e91c0a6c18 (CNA: Linux)

- https://git.kernel.org/stable/c/31ea4b175bc3ab430be15834d9ee8a1ce65bee15 (CNA: Linux)

- https://git.kernel.org/stable/c/20d18a5ec6ec364fcaf0d03af6fc43dcc42c6591 (CNA: Linux)

- https://git.kernel.org/stable/c/69a6a4f60b2da92c0bdfd9264b8ffe053f51f52a (CNA: Linux)

- https://git.kernel.org/stable/c/904367381a922aa2dc3e8bd2488e6c9180516c7a (CNA: Linux)

- https://git.kernel.org/stable/c/a154ca3c441a67d36b3a9ea63a4f11b06abe6223 (CNA: Linux)

- https://git.kernel.org/stable/c/725c1c3a8c5d920a7d3f5887412f2ad8e95a74f5 (CNA: Linux)

- https://git.kernel.org/stable/c/7f11e70629650ff6ea140984e5ce188b775b2683 (CNA: Linux)

- https://git.kernel.org/stable/c/085a5fde5bac29c01059e69399b417e91c0a6c18 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/20d18a5ec6ec364fcaf0d03af6fc43dcc42c6591 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/31ea4b175bc3ab430be15834d9ee8a1ce65bee15 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/69a6a4f60b2da92c0bdfd9264b8ffe053f51f52a (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/725c1c3a8c5d920a7d3f5887412f2ad8e95a74f5 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7f11e70629650ff6ea140984e5ce188b775b2683 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/904367381a922aa2dc3e8bd2488e6c9180516c7a (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/a154ca3c441a67d36b3a9ea63a4f11b06abe6223 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68355; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68355; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68355; retrieved 2026-11-06; source updated Not reported

Revision: 16ec4bcafc7fc03f52fc9ab0d36103267452dd89964d516af4152ee2fa04e344

Canonical: https://y2.dev/cve/CVE-2026-68355

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