{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50408", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:07.001Z", "datePublished": "2025-09-18T16:03:53.197Z", "dateUpdated": "2026-08-05T08:58:38.195Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:38.195Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit()\n\n> ret = brcmf_proto_tx_queue_data(drvr, ifp->ifidx, skb);\n\nmay be schedule, and then complete before the line\n\n> ndev->stats.tx_bytes += skb->len;\n\n[ 46.912801] ==================================================================\n[ 46.920552] BUG: KASAN: use-after-free in brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac]\n[ 46.928673] Read of size 4 at addr ffffff803f5882e8 by task systemd-resolve/328\n[ 46.935991]\n[ 46.937514] CPU: 1 PID: 328 Comm: systemd-resolve Tainted: G O 5.4.199-[REDACTED] #1\n[ 46.947255] Hardware name: [REDACTED]\n[ 46.954568] Call trace:\n[ 46.957037] dump_backtrace+0x0/0x2b8\n[ 46.960719] show_stack+0x24/0x30\n[ 46.964052] dump_stack+0x128/0x194\n[ 46.967557] print_address_description.isra.0+0x64/0x380\n[ 46.972877] __kasan_report+0x1d4/0x240\n[ 46.976723] kasan_report+0xc/0x18\n[ 46.980138] __asan_report_load4_noabort+0x18/0x20\n[ 46.985027] brcmf_netdev_start_xmit+0x718/0x8c8 [brcmfmac]\n[ 46.990613] dev_hard_start_xmit+0x1bc/0xda0\n[ 46.994894] sch_direct_xmit+0x198/0xd08\n[ 46.998827] __qdisc_run+0x37c/0x1dc0\n[ 47.002500] __dev_queue_xmit+0x1528/0x21f8\n[ 47.006692] dev_queue_xmit+0x24/0x30\n[ 47.010366] neigh_resolve_output+0x37c/0x678\n[ 47.014734] ip_finish_output2+0x598/0x2458\n[ 47.018927] __ip_finish_output+0x300/0x730\n[ 47.023118] ip_output+0x2e0/0x430\n[ 47.026530] ip_local_out+0x90/0x140\n[ 47.030117] igmpv3_sendpack+0x14c/0x228\n[ 47.034049] igmpv3_send_cr+0x384/0x6b8\n[ 47.037895] igmp_ifc_timer_expire+0x4c/0x118\n[ 47.042262] call_timer_fn+0x1cc/0xbe8\n[ 47.046021] __run_timers+0x4d8/0xb28\n[ 47.049693] run_timer_softirq+0x24/0x40\n[ 47.053626] __do_softirq+0x2c0/0x117c\n[ 47.057387] irq_exit+0x2dc/0x388\n[ 47.060715] __handle_domain_irq+0xb4/0x158\n[ 47.064908] gic_handle_irq+0x58/0xb0\n[ 47.068581] el0_irq_naked+0x50/0x5c\n[ 47.072162]\n[ 47.073665] Allocated by task 328:\n[ 47.077083] save_stack+0x24/0xb0\n[ 47.080410] __kasan_kmalloc.isra.0+0xc0/0xe0\n[ 47.084776] kasan_slab_alloc+0x14/0x20\n[ 47.088622] kmem_cache_alloc+0x15c/0x468\n[ 47.092643] __alloc_skb+0xa4/0x498\n[ 47.096142] igmpv3_newpack+0x158/0xd78\n[ 47.099987] add_grhead+0x210/0x288\n[ 47.103485] add_grec+0x6b0/0xb70\n[ 47.106811] igmpv3_send_cr+0x2e0/0x6b8\n[ 47.110657] igmp_ifc_timer_expire+0x4c/0x118\n[ 47.115027] call_timer_fn+0x1cc/0xbe8\n[ 47.118785] __run_timers+0x4d8/0xb28\n[ 47.122457] run_timer_softirq+0x24/0x40\n[ 47.126389] __do_softirq+0x2c0/0x117c\n[ 47.130142]\n[ 47.131643] Freed by task 180:\n[ 47.134712] save_stack+0x24/0xb0\n[ 47.138041] __kasan_slab_free+0x108/0x180\n[ 47.142146] kasan_slab_free+0x10/0x18\n[ 47.145904] slab_free_freelist_hook+0xa4/0x1b0\n[ 47.150444] kmem_cache_free+0x8c/0x528\n[ 47.154292] kfree_skbmem+0x94/0x108\n[ 47.157880] consume_skb+0x10c/0x5a8\n[ 47.161466] __dev_kfree_skb_any+0x88/0xa0\n[ 47.165598] brcmu_pkt_buf_free_skb+0x44/0x68 [brcmutil]\n[ 47.171023] brcmf_txfinalize+0xec/0x190 [brcmfmac]\n[ 47.176016] brcmf_proto_bcdc_txcomplete+0x1c0/0x210 [brcmfmac]\n[ 47.182056] brcmf_sdio_sendfromq+0x8dc/0x1e80 [brcmfmac]\n[ 47.187568] brcmf_sdio_dpc+0xb48/0x2108 [brcmfmac]\n[ 47.192529] brcmf_sdio_dataworker+0xc8/0x238 [brcmfmac]\n[ 47.197859] process_one_work+0x7fc/0x1a80\n[ 47.201965] worker_thread+0x31c/0xc40\n[ 47.205726] kthread+0x2d8/0x370\n[ 47.208967] ret_from_fork+0x10/0x18\n[ 47.212546]\n[ 47.214051] The buggy address belongs to the object at ffffff803f588280\n[ 47.214051] which belongs to the cache skbuff_head_cache of size 208\n[ 47.227086] The buggy address is located 104 bytes inside of\n[ 47.227086] 208-byte region [ffffff803f588280, ffffff803f588350)\n[ 47.238814] The buggy address belongs to the page:\n[ 47.243618] page:ffffffff00dd6200 refcount:1 mapcou\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is in brcmfmac's ndo_start_xmit TX path (brcmf_netdev_start_xmit → brcmf_proto_tx_queue_data), reached when the local stack transmits through the WiFi interface; it is not an RX/WiFi-frame-injection path, so Local applies rather than Adjacent/Network.\nAC:L - The attacker drives packet TX which both enters start_xmit and schedules async bus completion (brcmf_sdio_trigger_dpc/USB URB/PCIe TX status) that frees the skb, and can retry by flooding; the race was hit in practice (KASAN), so success does not depend on attacker-uncontrollable conditions.\nPR:L - Any unprivileged local user can open sockets and send traffic that is routed out a brcmfmac wlan interface (typical on Android phones and Broadcom/Cypress embedded devices), with no capability or init-namespace root required.\nUI:N - The attacker triggers the race solely by generating their own TX traffic on the interface; no separate victim action such as mounting a filesystem or opening a crafted file is required.\nS:U - The use-after-free corrupts host-kernel skbuff slab state within the same OS security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a slab use-after-free read of skb->len after brcmf_txfinalize frees the skbuff; per UAF guidance, reclaim/spray of the freed object enables kernel memory disclosure (including via the value later visible in interface TX stats).\nI:H - The same skbuff use-after-free is a reclaimable heap object under attacker-driven TX load; per UAF guidance this class of bug enables heap corruption and control-flow hijack primitives, so Integrity is High.\nA:H - The documented failure is a KASAN use-after-free in brcmf_netdev_start_xmit that oopses/panics the kernel, and any UAF scores Availability High even when not fully exploited for code execution." } ] } ], "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/core.c" ], "versions": [ { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "1613a7b24f1a7467cb727ba3ec77c9a808383560", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "d79f4d903e14dde822c60b5fd3bedc5a289d25df", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "49c742afd60f552fce7799287080db02bffe1db2", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "e01d96494a9de0f48b1167f0494f6d929fa773ed", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "232d59eca07f6ea27307022a33d226aff373bd02", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "27574a3f421c3a1694d0207f37c6bbf23d66978e", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "c369836cff98d3877f98c98e15c0151462812d96", "status": "affected", "versionType": "git" }, { "version": "b1a2a41126fc582a3d5613aa2d3e632b2eb1a2c4", "lessThan": "3f42faf6db431e04bf942d2ebe3ae88975723478", "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/core.c" ], "versions": [ { "version": "3.9", "status": "affected" }, { "version": "0", "lessThan": "3.9", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.296", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.262", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.220", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "3.9", "versionEndExcluding": "4.14.296" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "4.19.262" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.4.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.10.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.15.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1613a7b24f1a7467cb727ba3ec77c9a808383560" }, { "url": "https://git.kernel.org/stable/c/d79f4d903e14dde822c60b5fd3bedc5a289d25df" }, { "url": "https://git.kernel.org/stable/c/49c742afd60f552fce7799287080db02bffe1db2" }, { "url": "https://git.kernel.org/stable/c/e01d96494a9de0f48b1167f0494f6d929fa773ed" }, { "url": "https://git.kernel.org/stable/c/232d59eca07f6ea27307022a33d226aff373bd02" }, { "url": "https://git.kernel.org/stable/c/27574a3f421c3a1694d0207f37c6bbf23d66978e" }, { "url": "https://git.kernel.org/stable/c/c369836cff98d3877f98c98e15c0151462812d96" }, { "url": "https://git.kernel.org/stable/c/3f42faf6db431e04bf942d2ebe3ae88975723478" } ], "title": "wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "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": { "id": "CVE-2022-50408", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-01-14T19:08:23.930157Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:13:08.728Z" } } ] } }