CVE-2024-35811 (GCVE-0-2024-35811)
Vulnerability from cvelistv5
Published
2024-05-17 13:23
Modified
2026-08-05 11:30
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach This is the candidate patch of CVE-2023-47233 : https://nvd.nist.gov/vuln/detail/CVE-2023-47233 In brcm80211 driver,it starts with the following invoking chain to start init a timeout worker: ->brcmf_usb_probe ->brcmf_usb_probe_cb ->brcmf_attach ->brcmf_bus_started ->brcmf_cfg80211_attach ->wl_init_priv ->brcmf_init_escan ->INIT_WORK(&cfg->escan_timeout_work, brcmf_cfg80211_escan_timeout_worker); If we disconnect the USB by hotplug, it will call brcmf_usb_disconnect to make cleanup. The invoking chain is : brcmf_usb_disconnect ->brcmf_usb_disconnect_cb ->brcmf_detach ->brcmf_cfg80211_detach ->kfree(cfg); While the timeout woker may still be running. This will cause a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker. Fix it by deleting the timer and canceling the worker in brcmf_cfg80211_detach. [arend.vanspriel@broadcom.com: keep timer delete as is and cancel work just before free]
References
Impacted products
Vendor Product Version
Linux Linux Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
Version: e756af5b30b008f6ffcfebf8ad0b477f6f225b62
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              "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()` \u2192 `bus_reset` work \u2192 `brcmf_pcie_reset`/`brcmf_sdio_bus_reset` \u2192 `brcmf_detach` \u2192 `brcmf_cfg80211_detach` \u2192 `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 \u2014 the stalled scan that guarantees the 10 s escan timer expires and the firmware halt that drives the detach \u2014 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\u0027s 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()` \u2192 bus-reset \u2192 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\u0027s 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-\u003ed11inf.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-\u003ectl_ch`, `cfg-\u003escan_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."
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T03:21:47.516Z\"}}, {\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-05-12T11:52:09.242Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-35811\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:42:35.275433Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:13.106Z\"}}], \"cna\": {\"title\": \"wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\"}, \"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()` \\u2192 `bus_reset` work \\u2192 `brcmf_pcie_reset`/`brcmf_sdio_bus_reset` \\u2192 `brcmf_detach` \\u2192 `brcmf_cfg80211_detach` \\u2192 `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 \\u2014 the stalled scan that guarantees the 10 s escan timer expires and the firmware halt that drives the detach \\u2014 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\u0027s 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()` \\u2192 bus-reset \\u2192 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\u0027s 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-\u003ed11inf.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-\u003ectl_ch`, `cfg-\u003escan_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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"202c503935042272e2f9e1bb549d5f69a8681169\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"bacb8c3ab86dcd760c15903fcee58169bc3026aa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"8c36205123dc57349b59b4f1a2301eb278cbc731\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"0b812f706fd7090be74812101114a0e165b36744\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"190794848e2b9d15de92d502b6ac652806904f5a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"6678a1e7d896c00030b31491690e8ddc9a90767a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"0a7591e14a8da794d0b93b5d1c6254ccb23adacb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e756af5b30b008f6ffcfebf8ad0b477f6f225b62\", \"lessThan\": \"0f7352557a35ab7888bc7831411ec8a3cbe20d78\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.312\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.274\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003ebrcmf_usb_probe\\n  -\u003ebrcmf_usb_probe_cb\\n    -\u003ebrcmf_attach\\n      -\u003ebrcmf_bus_started\\n        -\u003ebrcmf_cfg80211_attach\\n          -\u003ewl_init_priv\\n            -\u003ebrcmf_init_escan\\n              -\u003eINIT_WORK(\u0026cfg-\u003eescan_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  -\u003ebrcmf_usb_disconnect_cb\\n    -\u003ebrcmf_detach\\n      -\u003ebrcmf_cfg80211_detach\\n        -\u003ekfree(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]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.312\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.274\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:30:05.862Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35811\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:30:05.862Z\", \"dateReserved\": \"2024-05-17T12:19:12.342Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T13:23:17.508Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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