{"api_version":"1","generated_at":"2026-08-22T02:51:21+00:00","cve":"CVE-2026-74336","urls":{"html":"https://cve.report/CVE-2026-74336","api":"https://cve.report/api/cve/CVE-2026-74336.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74336","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74336"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:34","updated_at":"2026-08-17 06:19:28"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889","name":"https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd","name":"https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74336","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74336","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e0c47c6229c25b54440fe1f84a0ff533942290b1 3abc13ec3ac28c343ad7e7b7496e807b924f0edd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e0c47c6229c25b54440fe1f84a0ff533942290b1 b224d18b1e5d1cddfc67f63f41d80023b2ec8889 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74336","cve":"CVE-2026-74336","epss":"0.001550000","percentile":"0.051890000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/linux/ieee80211-s1g.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3abc13ec3ac28c343ad7e7b7496e807b924f0edd","status":"affected","version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","versionType":"git"},{"lessThan":"b224d18b1e5d1cddfc67f63f41d80023b2ec8889","status":"affected","version":"e0c47c6229c25b54440fe1f84a0ff533942290b1","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/linux/ieee80211-s1g.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-08-17T05:17:27.975Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3abc13ec3ac28c343ad7e7b7496e807b924f0edd"},{"url":"https://git.kernel.org/stable/c/b224d18b1e5d1cddfc67f63f41d80023b2ec8889"}],"title":"wifi: mac80211: bound S1G TIM PVB walk to the TIM element","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74336","datePublished":"2026-08-15T05:58:27.799Z","dateReserved":"2026-08-15T05:44:03.885Z","dateUpdated":"2026-08-17T05:17:27.975Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:34","lastModifiedDate":"2026-08-17 06:19:28","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74336","Ordinal":"1","Title":"wifi: mac80211: bound S1G TIM PVB walk to the TIM element","CVE":"CVE-2026-74336","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74336","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: mac80211: bound S1G TIM PVB walk to the TIM element"}]}}}