{"id":"CVE-2026-93784","state":"PUBLISHED","title":"wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()\n\nThe KASAN allocation trace shows that a malformed IE buffer is\nstored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any\nvalidation. The crash trace shows that a subsequent SIOCSIWESSID\ntriggers a connection attempt which calls cfg80211_sme_get_conn_ies()\nto process the stored IE buffer, causing:\n\n - An out-of-bounds read in skip_ie() which reads ies[pos+1]\n   (the length byte) past the end of the 1-byte buffer.\n\n - An integer underflow in the memcpy size argument when offs\n   returned by ieee80211_ie_split() exceeds ies_len, causing\n   unsigned subtraction to wrap to SIZE_MAX and triggering a\n   fortify panic.\n\nFix this by validating the IE buffer in cfg80211_wext_siwgenie()\nbefore storing it.\n\n[drop unnecessary ie_len check, update commit message]","publishedAt":"2026-09-24T16:02:18.067Z","updatedAt":"2026-10-03T10:57:19.164Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"269498ce6c1e2132b072aa0c8660404926008f03","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"685082f4be77f4657b498ebbe9f942ef65c492cf","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"8b921a8993469a3482e0c67b5ce5cb6ce93f5f61","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"d01f1600e8b075aa17adb751ac9881bb6ee40dcc","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"c970879e03b23a27df42caf7ba506485a165fb96","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"01cc395cecfaa73134d39fb9a401d9605d8bb2c5","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"a2f5286ca4f304d3fd469f01b96b518608912a5c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/wext-sme.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.32","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.32","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","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":["net/wireless/wext-sme.c"]}],"references":["https://git.kernel.org/stable/c/269498ce6c1e2132b072aa0c8660404926008f03","https://git.kernel.org/stable/c/685082f4be77f4657b498ebbe9f942ef65c492cf","https://git.kernel.org/stable/c/8b921a8993469a3482e0c67b5ce5cb6ce93f5f61","https://git.kernel.org/stable/c/d01f1600e8b075aa17adb751ac9881bb6ee40dcc","https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96","https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5","https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93784.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93784","state":"PUBLISHED","datePublished":"2026-09-24T16:02:18.067Z","dateUpdated":"2026-10-03T10:57:19.164Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-18T17:59:28.788Z"},"containers":{"cna":{"title":"wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate IEs in cfg80211_wext_siwgenie()\n\nThe KASAN allocation trace shows that a malformed IE buffer is\nstored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any\nvalidation. The crash trace shows that a subsequent SIOCSIWESSID\ntriggers a connection attempt which calls cfg80211_sme_get_conn_ies()\nto process the stored IE buffer, causing:\n\n - An out-of-bounds read in skip_ie() which reads ies[pos+1]\n   (the length byte) past the end of the 1-byte buffer.\n\n - An integer underflow in the memcpy size argument when offs\n   returned by ieee80211_ie_split() exceeds ies_len, causing\n   unsigned subtraction to wrap to SIZE_MAX and triggering a\n   fortify panic.\n\nFix this by validating the IE buffer in cfg80211_wext_siwgenie()\nbefore storing it.\n\n[drop unnecessary ie_len check, update commit message]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"269498ce6c1e2132b072aa0c8660404926008f03","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"685082f4be77f4657b498ebbe9f942ef65c492cf","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"8b921a8993469a3482e0c67b5ce5cb6ce93f5f61","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"d01f1600e8b075aa17adb751ac9881bb6ee40dcc","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"c970879e03b23a27df42caf7ba506485a165fb96","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"01cc395cecfaa73134d39fb9a401d9605d8bb2c5","versionType":"git"},{"version":"f21293549f60f88c74fcb9944737f11048896dc4","status":"affected","lessThan":"a2f5286ca4f304d3fd469f01b96b518608912a5c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/wext-sme.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.32","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.32","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","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":["net/wireless/wext-sme.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/269498ce6c1e2132b072aa0c8660404926008f03"},{"url":"https://git.kernel.org/stable/c/685082f4be77f4657b498ebbe9f942ef65c492cf"},{"url":"https://git.kernel.org/stable/c/8b921a8993469a3482e0c67b5ce5cb6ce93f5f61"},{"url":"https://git.kernel.org/stable/c/d01f1600e8b075aa17adb751ac9881bb6ee40dcc"},{"url":"https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96"},{"url":"https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5"},{"url":"https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:57:19.164Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}