{"id":"CVE-2026-74336","state":"PUBLISHED","title":"wifi: mac80211: bound S1G TIM PVB walk to the TIM element","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: bound S1G TIM PVB walk to the TIM element\n\nieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a\nreceived TIM element. The TIM is handed in as the element payload:\nieee802_11_parse_elems_full() stores elems->tim = elem->data and\nelems->tim_len = elem->datalen (net/mac80211/parse.c), so the valid bytes\nare [tim, tim + tim_len).\n\nWhen walking the encoded blocks the function passes the walker an end\nsentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of\nthe element. ieee80211_s1g_find_target_block() loops while (ptr + 1 <= end)\nand dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read\n*ptr), so it can read up to two bytes beyond the TIM element -- an\nout-of-bounds read of adjacent skb/heap data when the TIM is the last\nelement in the frame. The +2 appears to account for the element id/len\nheader, but tim already points past that header at the element payload, so\nthe addend is wrong.\n\nPass the correct element end, (const u8 *)tim + tim_len.","publishedAt":"2026-08-15T05:58:27.799Z","updatedAt":"2026-10-15T10:08:55.597Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","status":"affected","lessThan":"68cf46755894d495b432e21f9e25637030d8b075","versionType":"git"},{"version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","status":"affected","lessThan":"3abc13ec3ac28c343ad7e7b7496e807b924f0edd","versionType":"git"},{"version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","status":"affected","lessThan":"b224d18b1e5d1cddfc67f63f41d80023b2ec8889","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/ieee80211-s1g.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/ieee80211-s1g.h"]}],"references":["https://git.kernel.org/stable/c/68cf46755894d495b432e21f9e25637030d8b075","https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd","https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74336.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74336","state":"PUBLISHED","datePublished":"2026-08-15T05:58:27.799Z","dateUpdated":"2026-10-15T10:08:55.597Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.885Z"},"containers":{"cna":{"title":"wifi: mac80211: bound S1G TIM PVB walk to the TIM element","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: bound S1G TIM PVB walk to the TIM element\n\nieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a\nreceived TIM element. The TIM is handed in as the element payload:\nieee802_11_parse_elems_full() stores elems->tim = elem->data and\nelems->tim_len = elem->datalen (net/mac80211/parse.c), so the valid bytes\nare [tim, tim + tim_len).\n\nWhen walking the encoded blocks the function passes the walker an end\nsentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of\nthe element. ieee80211_s1g_find_target_block() loops while (ptr + 1 <= end)\nand dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read\n*ptr), so it can read up to two bytes beyond the TIM element -- an\nout-of-bounds read of adjacent skb/heap data when the TIM is the last\nelement in the frame. The +2 appears to account for the element id/len\nheader, but tim already points past that header at the element payload, so\nthe addend is wrong.\n\nPass the correct element end, (const u8 *)tim + tim_len."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","status":"affected","lessThan":"68cf46755894d495b432e21f9e25637030d8b075","versionType":"git"},{"version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","status":"affected","lessThan":"3abc13ec3ac28c343ad7e7b7496e807b924f0edd","versionType":"git"},{"version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","status":"affected","lessThan":"b224d18b1e5d1cddfc67f63f41d80023b2ec8889","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/ieee80211-s1g.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/ieee80211-s1g.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/68cf46755894d495b432e21f9e25637030d8b075"},{"url":"https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd"},{"url":"https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-15T10:08:55.597Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}