{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26666", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.149Z", "datePublished": "2024-04-02T06:22:14.974Z", "dateUpdated": "2026-08-05T11:26:41.038Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:41.038Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: fix RCU use in TDLS fast-xmit\n\nThis looks up the link under RCU protection, but isn't\nguaranteed to actually have protection. Fix that." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - This is mac80211 client-side TDLS/MLO transmit code; both sides of the exposure (AP-MLD link reconfiguration that tears down `sdata->link[]`, and TDLS-peer state/power-save transitions that re-run `ieee80211_check_fast_xmit()`) are driven by 802.11 peers on the same WLAN. Per WiFi guidance this is Adjacent, not Network.\nAC:H - Exploitation requires conditions the attacker cannot influence: an 802.11be MLD association with a TDLS peer on a separately-allocated link (non-MLO stations use the embedded `sdata->deflink`, which is never freed), plus a kernel config where the enclosing `spin_lock_bh(&sta->lock)` does not already imply an RCU read-side section — on non-preemptible RCU it does, and on PREEMPT_RT `local_bh_disable()` explicitly calls `rcu_read_lock()`, so `synchronize_rcu()` in `ieee80211_tear_down_links()` cannot complete during the window on common configurations.\nPR:N - An over-the-air attacker (rogue/controlled AP MLD triggering link reconfiguration, or a TDLS peer) holds no privileges or account on the victim host. No local credentials or capabilities on the vulnerable system are needed.\nUI:N - Association to the AP MLD and TDLS session setup are performed automatically by the supplicant for configured networks, and the `ieee80211_check_fast_xmit()` triggers (STA authorization, PS transitions, key install, CLEAR_PS_FILT on TX) all occur without any operator action.\nS:U - The unprotected dereference, the freed `link_container`, and any resulting fault all live within the kernel's own security authority. No VM, sandbox, or IOMMU boundary is crossed.\nC:H - Winning the race yields a use-after-free read of the freed `link_container`, and the 6 stale bytes are written into `addr3` of the cached 802.11 header and then transmitted, exposing freed kernel heap contents to any passive sniffer; the fast-xmit cache is rebuilt repeatedly, so the slot can be resampled as it is reallocated to different objects.\nI:L - There is no write to freed memory and no out-of-bounds write — the only integrity effect is that outbound TDLS frames carry a corrupted BSSID, and on the pre-fix `WARN_ON_ONCE(!link)` path a `hdr_len == 0` cache entry produces malformed frames whose 802.11 header is overwritten by the RFC1042 SNAP.\nA:H - Dereferencing the freed link can oops when the backing slab page has been returned to the allocator or is poisoned under KASAN/KFENCE/SLUB_DEBUG, and the `WARN_ON_ONCE(!link)` on a torn-down link is fatal on the widely-used `panic_on_warn` configurations." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mac80211/tx.c" ], "versions": [ { "version": "8cc07265b69141f8ed9597d0f27185239c241c80", "lessThan": "fc3432ae8232ff4025e7c55012dd88db0e3d18eb", "status": "affected", "versionType": "git" }, { "version": "8cc07265b69141f8ed9597d0f27185239c241c80", "lessThan": "c255c3b653c6e8b52ac658c305e2fece2825f7ad", "status": "affected", "versionType": "git" }, { "version": "8cc07265b69141f8ed9597d0f27185239c241c80", "lessThan": "9480adfe4e0f0319b9da04b44e4eebd5ad07e0cd", "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/tx.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.17", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.5", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "6.5", "versionEndExcluding": "6.6.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.7.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fc3432ae8232ff4025e7c55012dd88db0e3d18eb" }, { "url": "https://git.kernel.org/stable/c/c255c3b653c6e8b52ac658c305e2fece2825f7ad" }, { "url": "https://git.kernel.org/stable/c/9480adfe4e0f0319b9da04b44e4eebd5ad07e0cd" } ], "title": "wifi: mac80211: fix RCU use in TDLS fast-xmit", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "affected": [ { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:a:linux:linux_kernel:-:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "8cc07265b691", "status": "affected", "lessThan": "fc3432ae8232", "versionType": "git" }, { "version": "8cc07265b691", "status": "affected", "lessThan": "c255c3b653c6", "versionType": "git" }, { "version": "8cc07265b691", "status": "affected", "lessThan": "9480adfe4e0f", "versionType": "git" }, { "version": "6.5", "status": "affected" }, { "version": "0", "status": "affected", "lessThan": "6.5", "versionType": "custom" }, { "version": "6.6.17", "status": "affected", "lessThanOrEqual": "6.6*", "versionType": "custom" }, { "version": "6.75", "status": "affected", "lessThanOrEqual": "6.7*", "versionType": "custom" }, { "version": "6.8", "status": "affected", "lessThanOrEqual": "*", "versionType": "custom" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-11-04T16:57:36.655308Z", "id": "CVE-2024-26666", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-04T17:03:18.143Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:12.542Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/fc3432ae8232ff4025e7c55012dd88db0e3d18eb", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c255c3b653c6e8b52ac658c305e2fece2825f7ad", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/9480adfe4e0f0319b9da04b44e4eebd5ad07e0cd", "tags": [ "x_transferred" ] } ] } ] } }