{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47611","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-06-19T14:55:32.795Z","datePublished":"2024-06-19T14:58:00.362Z","dateUpdated":"2026-08-05T08:48:36.304Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:48:36.304Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmac80211: validate extended element ID is present\n\nBefore attempting to parse an extended element, verify that\nthe extended element ID is present."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The bug is in mac80211 IE parsing of received 802.11 management frames (beacons/probe responses/IBSS/mesh), which an attacker on the same Wi‑Fi RF segment can inject; this is Adjacent, not routable Network.\nAC:L - An attacker can reliably send a WLAN_EID_EXTENSION element with datalen=0 (optionally followed by ext ID 35) so elem->data[0] and the underflown len=255 path are hit with no race or layout dependency.\nPR:N - Beacon and probe-response IE parsing runs on unauthenticated over-the-air frames before any host credentials or capabilities are involved, so no privileges on the victim are required.\nUI:N - mac80211 parses these IEs automatically on the RX/workqueue path whenever Wi‑Fi is operating or scanning; no extra user action is required.\nS:U - Impact is confined to the host kernel wireless stack and does not cross a VM, IOMMU, or other separate security authority.\nC:H - With datalen=0, len underflows to 255 and extension parsing (especially WLAN_EID_EXT_HE_CAPABILITY, which applies no length check) can read far past the IE buffer into adjacent kernel memory, which is an unbounded OOB read rather than a few-byte leak.\nI:N - The defect is an out-of-bounds read that may copy OOB bytes into fixed-size HE capability fields; destination PPE buffers are sized for the maximum computed length, so there is no OOB write or UAF write primitive.\nA:H - Reading tens to hundreds of bytes past the IE/skb buffer can fault on unmapped memory and oops/panic the kernel, yielding a complete denial of service."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/util.c"],"versions":[{"version":"41cbb0f5a29592874355e4159489eb08337cd50e","lessThan":"03029bb044ccee60adbc93e70713f3ae58abc3a1","status":"affected","versionType":"git"},{"version":"41cbb0f5a29592874355e4159489eb08337cd50e","lessThan":"a19cf6844b509d44ecbd536f33d314d91ecdd2b5","status":"affected","versionType":"git"},{"version":"41cbb0f5a29592874355e4159489eb08337cd50e","lessThan":"7fd214fc7f2ee3a89f91e717e3cfad55f5a27045","status":"affected","versionType":"git"},{"version":"41cbb0f5a29592874355e4159489eb08337cd50e","lessThan":"c62b16f98688ae7bc0ab23a6490481f4ce9b3a49","status":"affected","versionType":"git"},{"version":"41cbb0f5a29592874355e4159489eb08337cd50e","lessThan":"768c0b19b50665e337c96858aa2b7928d6dcf756","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/mac80211/util.c"],"versions":[{"version":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","status":"unaffected","versionType":"semver"},{"version":"4.19.222","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.168","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.88","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.11","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.16","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"4.19.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.4.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.16"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/03029bb044ccee60adbc93e70713f3ae58abc3a1"},{"url":"https://git.kernel.org/stable/c/a19cf6844b509d44ecbd536f33d314d91ecdd2b5"},{"url":"https://git.kernel.org/stable/c/7fd214fc7f2ee3a89f91e717e3cfad55f5a27045"},{"url":"https://git.kernel.org/stable/c/c62b16f98688ae7bc0ab23a6490481f4ce9b3a49"},{"url":"https://git.kernel.org/stable/c/768c0b19b50665e337c96858aa2b7928d6dcf756"}],"title":"mac80211: validate extended element ID is present","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-06-20T13:48:17.643512Z","id":"CVE-2021-47611","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-20T13:48:23.836Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:47:40.575Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/03029bb044ccee60adbc93e70713f3ae58abc3a1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a19cf6844b509d44ecbd536f33d314d91ecdd2b5","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/7fd214fc7f2ee3a89f91e717e3cfad55f5a27045","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c62b16f98688ae7bc0ab23a6490481f4ce9b3a49","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/768c0b19b50665e337c96858aa2b7928d6dcf756","tags":["x_transferred"]}]}]}}