wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers

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Summary

CVECVE-2026-64255
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:55 UTC
Updated2026-07-24 16:16:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers Three BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a station ID without checking that sta_mask is non-zero. When sta_mask is zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing an out-of-bounds access on fw_id_to_link_sta[]. Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call, consistent with the existing check in iwl_mld_ampdu_rx_start().

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.051060000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 git Not specified
CNA Linux Linux affected 6.18.38 semver Not specified
CNA Linux Linux affected 7.1.3 semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1de92789ce31e46fa7e7d8e89c90b19cdb1c103b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f056fc2b927448d37eca6b6cacc3d1b0f67b20d2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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