{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53138", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-02T15:51:43.562Z", "datePublished": "2025-05-02T15:56:10.372Z", "dateUpdated": "2026-08-05T09:12:53.138Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:53.138Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: caif: Fix use-after-free in cfusbl_device_notify()\n\nsyzbot reported use-after-free in cfusbl_device_notify() [1]. This\ncauses a stack trace like below:\n\nBUG: KASAN: use-after-free in cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138\nRead of size 8 at addr ffff88807ac4e6f0 by task kworker/u4:6/1214\n\nCPU: 0 PID: 1214 Comm: kworker/u4:6 Not tainted 5.19.0-rc3-syzkaller-00146-g92f20ff72066 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313\n print_report mm/kasan/report.c:429 [inline]\n kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491\n cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138\n notifier_call_chain+0xb5/0x200 kernel/notifier.c:87\n call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\n netdev_wait_allrefs_any net/core/dev.c:10227 [inline]\n netdev_run_todo+0xbc0/0x10f0 net/core/dev.c:10341\n default_device_exit_batch+0x44e/0x590 net/core/dev.c:11334\n ops_exit_list+0x125/0x170 net/core/net_namespace.c:167\n cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594\n process_one_work+0x996/0x1610 kernel/workqueue.c:2289\n worker_thread+0x665/0x1080 kernel/workqueue.c:2436\n kthread+0x2e9/0x3a0 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302\n \n\nWhen unregistering a net device, unregister_netdevice_many_notify()\nsets the device's reg_state to NETREG_UNREGISTERING, calls notifiers\nwith NETDEV_UNREGISTER, and adds the device to the todo list.\n\nLater on, devices in the todo list are processed by netdev_run_todo().\nnetdev_run_todo() waits devices' reference count become 1 while\nrebdoadcasting NETDEV_UNREGISTER notification.\n\nWhen cfusbl_device_notify() is called with NETDEV_UNREGISTER multiple\ntimes, the parent device might be freed. This could cause UAF.\nProcessing NETDEV_UNREGISTER multiple times also causes inbalance of\nreference count for the module.\n\nThis patch fixes the issue by accepting only first NETDEV_UNREGISTER\nnotification." } ], "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 reached via local netlink/netns operations: create stacked netdevs (e.g. virt_wifi with SET_NETDEV_DEV parent pointing at a veth), then destroy the netns so cleanup_net/netdev_run_todo rebroadcasts NETDEV_UNREGISTER after the parent is freed. Syzbot reproduced this path without physical USB.\nAC:L - The attacker controls both sides—creating the parent/child netdev pair, holding child references (e.g. sockets) so the child stays on the todo list, and tearing down the netns. The double NETDEV_UNREGISTER rebroadcast is deterministic kernel behavior under those conditions, not a race outside attacker control.\nPR:L - Creating net namespaces and virtual netdevs requires CAP_NET_ADMIN, which an unprivileged user can obtain in a user namespace (unshare -Urn). Real root in the init namespace is not required.\nUI:N - Exploitation needs no victim action; the attacker triggers registration and netns teardown entirely on their own.\nS:U - This is a standard in-kernel UAF enabling local privilege escalation within the same security authority, not a cross-boundary escape (VM/IOMMU/sandbox).\nC:H - Use-after-free of the parent device object lets an attacker reclaim and control the freed object's contents, enabling arbitrary kernel memory disclosure.\nI:H - The same UAF is exploitable via heap spraying for arbitrary write/control-flow hijacking; the related module_put imbalance on CAIF USB unregister further enables integrity compromise.\nA:H - The UAF reliably causes kernel oops/panic (as shown by the KASAN report in cleanup_net), so availability impact is high even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/caif/caif_usb.c" ], "versions": [ { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "68a45c3cf0e2242a533657f4f535d9b6a7447a79", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "1793da97a23e31c5bf06631f3f3e5a25f368fd64", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "9dc16be373b382ddd4c274052a6e870a95e76c01", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "c3aaec463a632cf4187dc017e421bfa69d7834a9", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "3f14457e1584224f4296af613bbd99deb60b5d91", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "287027d8a567168a5d8ce5cb0cba16a34791a48c", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179", "status": "affected", "versionType": "git" }, { "version": "7ad65bf68d705b445ef10b77ab50dab22be185ee", "lessThan": "9781e98a97110f5e76999058368b4be76a788484", "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/caif/caif_usb.c" ], "versions": [ { "version": "3.3", "status": "affected" }, { "version": "0", "lessThan": "3.3", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.310", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.278", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.237", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.175", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.103", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.20", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.7", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "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": "3.3", "versionEndExcluding": "4.14.310" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "4.19.278" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.4.237" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.10.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.15.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.1.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.2.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79" }, { "url": "https://git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64" }, { "url": "https://git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01" }, { "url": "https://git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9" }, { "url": "https://git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91" }, { "url": "https://git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c" }, { "url": "https://git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179" }, { "url": "https://git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484" } ], "title": "net: caif: Fix use-after-free in cfusbl_device_notify()", "x_generator": { "engine": "bippy-1.2.0" } } } }