{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-35811","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-17T12:19:12.342Z","datePublished":"2024-05-17T13:23:17.508Z","dateUpdated":"2026-08-05T11:30:05.862Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:30:05.862Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach\n\nThis is the candidate patch of CVE-2023-47233 :\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-47233\n\nIn brcm80211 driver,it starts with the following invoking chain\nto start init a timeout worker:\n\n->brcmf_usb_probe\n  ->brcmf_usb_probe_cb\n    ->brcmf_attach\n      ->brcmf_bus_started\n        ->brcmf_cfg80211_attach\n          ->wl_init_priv\n            ->brcmf_init_escan\n              ->INIT_WORK(&cfg->escan_timeout_work,\n\t\t  brcmf_cfg80211_escan_timeout_worker);\n\nIf we disconnect the USB by hotplug, it will call\nbrcmf_usb_disconnect to make cleanup. The invoking chain is :\n\nbrcmf_usb_disconnect\n  ->brcmf_usb_disconnect_cb\n    ->brcmf_detach\n      ->brcmf_cfg80211_detach\n        ->kfree(cfg);\n\nWhile the timeout woker may still be running. This will cause\na use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker.\n\nFix it by deleting the timer and canceling the worker in\nbrcmf_cfg80211_detach.\n\n[arend.vanspriel@broadcom.com: keep timer delete as is and cancel work just before free]"}],"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 vulnerable free/use race is in a WiFi driver and is reached automatically via the firmware-crash recovery path (`brcmf_fw_crashed()` → `bus_reset` work → `brcmf_pcie_reset`/`brcmf_sdio_bus_reset` → `brcmf_detach` → `brcmf_cfg80211_detach` → `kfree(cfg)`), while the escan timeout worker fires precisely because the firmware stopped responding mid-scan. An adjacent 802.11 attacker who induces a firmware halt (a well-documented failure mode of Broadcom fullmac firmware when fed malformed frames) while the station is doing its routine background scanning triggers both sides of the race over the air.\nAC:L - The attacker controls both halves of the race — the stalled scan that guarantees the 10 s escan timer expires and the firmware halt that drives the detach — and the window is wide because the worker blocks in `brcmf_fil_cmd_data_set()` waiting on a dead firmware while `brcmf_cfg80211_detach()` frees `escan_buf` and `cfg` in parallel. The attempt is freely repeatable, and heap grooming of the freed 65000-byte buffer and `cfg` slab is standard.\nPR:N - No local account or capability is needed on the affected system: the scan is issued by the normal background supplicant/NetworkManager activity, and the detach is performed autonomously by the driver's bus-reset recovery worker in response to a firmware halt. The originally reported USB-hotplug variant likewise requires no privileges.\nUI:N - Background scanning by wpa_supplicant/NetworkManager is continuous and automatic, and the `brcmf_fw_crashed()` → bus-reset → detach sequence runs entirely inside the kernel without any user action. No victim interaction is required at any point.\nS:U - The use-after-free corrupts kernel heap objects and is exploited within the kernel's own security authority, with no crossing of a hypervisor, IOMMU, or sandbox boundary. Impact remains confined to the kernel that owns the vulnerable component.\nC:H - After the free, `brcmf_inform_bss()` walks the dangling `escan_info.escan_buf` with a length/count taken from reallocated memory, giving controlled out-of-bounds reads, and `brcmf_inform_single_bss()` hands the resulting `notify_ie`/`notify_ielen` to `cfg80211_inform_bss_data()`, which copies that kernel memory into a BSS entry retrievable by userspace via nl80211. This is an arbitrary kernel-memory read with a direct exfiltration channel.\nI:H - The worker performs an indirect call through `cfg->d11inf.decchspec`, a function pointer loaded from the freed `cfg` object, giving control-flow hijack once the slab is reallocated with attacker-controlled data, and it also writes into freed memory (`bi->ctl_ch`, `cfg->scan_request = NULL`, `timer_delete_sync()` on a freed `timer_list`). Combined with the stale `ifp` and `scan_request` passed into further kernel calls, this yields write and code-execution primitives.\nA:H - Even without full exploitation, dereferencing the freed `cfg`, freed `escan_buf`, and freed `brcmf_if`, and running `timer_delete_sync()`/`cfg80211_scan_done()` on freed structures, reliably produces oopses, slab corruption, and kernel panic. The WiFi interface is destroyed and the system crashes."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c"],"versions":[{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"202c503935042272e2f9e1bb549d5f69a8681169","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"bacb8c3ab86dcd760c15903fcee58169bc3026aa","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"8c36205123dc57349b59b4f1a2301eb278cbc731","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"0b812f706fd7090be74812101114a0e165b36744","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"190794848e2b9d15de92d502b6ac652806904f5a","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"6678a1e7d896c00030b31491690e8ddc9a90767a","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"0a7591e14a8da794d0b93b5d1c6254ccb23adacb","status":"affected","versionType":"git"},{"version":"e756af5b30b008f6ffcfebf8ad0b477f6f225b62","lessThan":"0f7352557a35ab7888bc7831411ec8a3cbe20d78","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c"],"versions":[{"version":"3.7","status":"affected"},{"version":"0","lessThan":"3.7","status":"unaffected","versionType":"semver"},{"version":"4.19.312","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.274","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.215","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.154","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.84","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.24","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.12","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8.3","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","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":"3.7","versionEndExcluding":"4.19.312"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.4.274"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.10.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.15.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.1.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.6.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.7.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.8.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169"},{"url":"https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1"},{"url":"https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa"},{"url":"https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731"},{"url":"https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744"},{"url":"https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a"},{"url":"https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a"},{"url":"https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb"},{"url":"https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78"}],"title":"wifi: 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