wifi: mac80211: bound S1G TIM PVB walk to the TIM element

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Summary

CVECVE-2026-74336
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:34 UTC
Updated2026-08-17 06:19:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: bound S1G TIM PVB walk to the TIM element ieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a received TIM element. The TIM is handed in as the element payload: ieee802_11_parse_elems_full() stores elems->tim = elem->data and elems->tim_len = elem->datalen (net/mac80211/parse.c), so the valid bytes are [tim, tim + tim_len). When walking the encoded blocks the function passes the walker an end sentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of the element. ieee80211_s1g_find_target_block() loops while (ptr + 1 <= end) and dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read *ptr), so it can read up to two bytes beyond the TIM element -- an out-of-bounds read of adjacent skb/heap data when the TIM is the last element in the frame. The +2 appears to account for the element id/len header, but tim already points past that header at the element payload, so the addend is wrong. Pass the correct element end, (const u8 *)tim + tim_len.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.051890000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e0c47c6229c25b54440fe1f84a0ff533942290b1 3abc13ec3ac28c343ad7e7b7496e807b924f0edd git Not specified
CNA Linux Linux affected e0c47c6229c25b54440fe1f84a0ff533942290b1 b224d18b1e5d1cddfc67f63f41d80023b2ec8889 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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