{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39864","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.143Z","datePublished":"2025-09-19T15:26:33.787Z","dateUpdated":"2026-08-05T12:05:44.524Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:05:44.524Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: fix use-after-free in cmp_bss()\n\nFollowing bss_free() quirk introduced in commit 776b3580178f\n(\"cfg80211: track hidden SSID networks properly\"), adjust\ncfg80211_update_known_bss() to free the last beacon frame\nelements only if they're not shared via the corresponding\n'hidden_beacon_bss' pointer."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The trigger is entirely over-the-air 802.11 management traffic — spoofed hidden-SSID beacons/probe responses to populate the victim's BSS cache, plus a CSA element in a beacon or unprotected public action frame — requiring only radio range of the target STA. Per kernel guidance, WiFi frame injection is Adjacent.\nAC:L - The attacker controls every precondition: SSID hiding, BSSID, the two channels, the beacon/probe-response pairs that build the hidden groups, and the CSA that fires `cfg80211_update_assoc_bss_entry()`; the victim's routine background scans supply the rest without attacker effort. The freed object's size is attacker-chosen via IE length, so heap grooming is also under attacker control.\nPR:N - No credentials or account on the target system are needed; beacons, probe responses and public action frames are unauthenticated and unprotected (beacon protection/BIGTK is rarely deployed), so a rogue AP or frame injector reaches the code with zero privileges.\nUI:N - Scanning, beacon processing and CSA handling are performed automatically by the kernel for an associated STA — no user action is required, and the attacker can spoof the legitimate AP's frames against an already-connected victim.\nS:U - The freed `cfg80211_bss_ies` allocation and all corrupted state live in the kernel's own slab and cfg80211 BSS list; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The stale `beacon_ies`/`ies` pointers are read by `cmp_bss()` and, critically, copied wholesale to userspace via `NL80211_BSS_BEACON_IES` in scan dumps, disclosing reallocated freed heap contents — and an attacker-controlled `len` after reallocation extends this to a large out-of-bounds kernel memory read.\nI:H - The shared IEs are freed while still owned by the beacon BSS, so the later `bss_free()` performs a second `kfree_rcu()` on the same object — a double free of an attacker-sized allocation, a well-established primitive for arbitrary write and control-flow hijack; freed-memory contents also drive rb-tree ordering decisions.\nA:H - Use-after-free reads in `cmp_bss()` plus the subsequent double free corrupt the slab allocator and reliably produce oopses/panics, and the condition can be re-triggered at will by an in-range attacker."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/scan.c"],"versions":[{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"a8bb681e879ca3c9f722aa08d3d7ae41c42a8807","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"a97a9791e455bb0cd5e7a38b5abcb05523d4e21c","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"ff040562c10a540b8d851f7f4145fa112977f853","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"6854476d9e1aeaaf05ebc98d610061c2075db07d","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"b7d08929178c16398278613df07ad65cf63cce9d","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"5b7ae04969f822283a95c866967e42b4d75e0eef","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"912c4b66bef713a20775cfbf3b5e9bd71525c716","status":"affected","versionType":"git"},{"version":"3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6","lessThan":"26e84445f02ce6b2fe5f3e0e28ff7add77f35e08","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/wireless/scan.c"],"versions":[{"version":"5.4","status":"affected"},{"version":"0","lessThan":"5.4","status":"unaffected","versionType":"semver"},{"version":"5.4.299","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.243","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.192","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.151","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.105","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.46","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.16.6","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17","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":"5.4","versionEndExcluding":"5.4.299"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.243"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.192"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.1.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.6.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.12.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.16.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a8bb681e879ca3c9f722aa08d3d7ae41c42a8807"},{"url":"https://git.kernel.org/stable/c/a97a9791e455bb0cd5e7a38b5abcb05523d4e21c"},{"url":"https://git.kernel.org/stable/c/ff040562c10a540b8d851f7f4145fa112977f853"},{"url":"https://git.kernel.org/stable/c/6854476d9e1aeaaf05ebc98d610061c2075db07d"},{"url":"https://git.kernel.org/stable/c/b7d08929178c16398278613df07ad65cf63cce9d"},{"url":"https://git.kernel.org/stable/c/5b7ae04969f822283a95c866967e42b4d75e0eef"},{"url":"https://git.kernel.org/stable/c/912c4b66bef713a20775cfbf3b5e9bd71525c716"},{"url":"https://git.kernel.org/stable/c/26e84445f02ce6b2fe5f3e0e28ff7add77f35e08"}],"title":"wifi: 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