{ "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" ] } ] } ] } }