Adjacent kernel-memory read via oversized TIM sentinel
Published Aug 15, 2026 · Updated Aug 15, 2026
Out-of-bounds read in Linux mac80211 6.18 through 7.1.4 allows attackers to read adjacent kernel memory via a crafted S1G TIM frame. ieee80211_s1g_check_tim() gives the PVB walker an end sentinel two bytes beyond the TIM payload, and the walker dereferences through that incorrect boundary. The S1G TIM must be received with its PVB at the end of the frame element data; the bounded consequence is a two-byte read of adjacent skb or heap memory, with kernel instability also possible.
Summary
What happened
Out-of-bounds read in Linux mac80211 6.18 through 7.1.4 allows attackers to read adjacent kernel memory via a crafted S1G TIM frame. ieee80211_s1g_check_tim() gives the PVB walker an end sentinel two bytes beyond the TIM payload, and the walker dereferences through that incorrect boundary. The S1G TIM must be received with its PVB at the end of the frame element data; the bounded consequence is a two-byte read of adjacent skb or heap memory, with kernel instability also possible.
The record
- CVE
- CVE-2026-74336
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=6.18
- Affected versionversion=e0c47c6229c25b54440fe1f84a0ff533942290b1 <3abc13ec3ac28c343ad7e7b7496e807b924f0edd
- Affected versionversion=e0c47c6229c25b54440fe1f84a0ff533942290b1 <b224d18b1e5d1cddfc67f63f41d80023b2ec8889
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Attacks
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