{"id":"CVE-2025-38509","state":"PUBLISHED","title":"wifi: mac80211: reject VHT opmode for unsupported channel widths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: reject VHT opmode for unsupported channel widths\n\nVHT operating mode notifications are not defined for channel widths\nbelow 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the\nVHT specification and must be rejected.\n\nWithout this check, malformed notifications using these widths may\nreach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to\ninvalid input. This issue was reported by syzbot.\n\nReject these unsupported widths early in sta_link_apply_parameters()\nwhen opmode_notif is used. The accepted set includes 20, 40, 80, 160,\nand 80+80 MHz, which are valid for VHT. While 320 MHz is not defined\nfor VHT, it is allowed to avoid rejecting HE or EHT clients that may\nstill send a VHT opmode notification.","publishedAt":"2025-08-16T10:54:46.493Z","updatedAt":"2026-05-11T21:29:23.717Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"751e7489c1d74b94ffffbed619d8fd724eeff4ee","status":"affected","lessThan":"18eca59a04500b68a90e0c5c873f97c9d1ea2bfa","versionType":"git"},{"version":"751e7489c1d74b94ffffbed619d8fd724eeff4ee","status":"affected","lessThan":"58fcb1b4287ce38850402bb2bb16d09bf77b91d9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/cfg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.15.7","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/cfg.c"]}],"references":["https://git.kernel.org/stable/c/18eca59a04500b68a90e0c5c873f97c9d1ea2bfa","https://git.kernel.org/stable/c/58fcb1b4287ce38850402bb2bb16d09bf77b91d9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38509.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38509","state":"PUBLISHED","datePublished":"2025-08-16T10:54:46.493Z","dateUpdated":"2026-05-11T21:29:23.717Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:24.022Z"},"containers":{"cna":{"title":"wifi: mac80211: reject VHT opmode for unsupported channel widths","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: reject VHT opmode for unsupported channel widths\n\nVHT operating mode notifications are not defined for channel widths\nbelow 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the\nVHT specification and must be rejected.\n\nWithout this check, malformed notifications using these widths may\nreach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to\ninvalid input. This issue was reported by syzbot.\n\nReject these unsupported widths early in sta_link_apply_parameters()\nwhen opmode_notif is used. The accepted set includes 20, 40, 80, 160,\nand 80+80 MHz, which are valid for VHT. While 320 MHz is not defined\nfor VHT, it is allowed to avoid rejecting HE or EHT clients that may\nstill send a VHT opmode notification."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"751e7489c1d74b94ffffbed619d8fd724eeff4ee","status":"affected","lessThan":"18eca59a04500b68a90e0c5c873f97c9d1ea2bfa","versionType":"git"},{"version":"751e7489c1d74b94ffffbed619d8fd724eeff4ee","status":"affected","lessThan":"58fcb1b4287ce38850402bb2bb16d09bf77b91d9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/cfg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.15.7","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/cfg.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/18eca59a04500b68a90e0c5c873f97c9d1ea2bfa"},{"url":"https://git.kernel.org/stable/c/58fcb1b4287ce38850402bb2bb16d09bf77b91d9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:29:23.717Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.15.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}