264 lines
16 KiB
JSON
264 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-53138",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-05-02T15:51:43.562Z",
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"datePublished": "2025-05-02T15:56:10.372Z",
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"dateUpdated": "2026-08-05T09:12:53.138Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:12:53.138Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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 <TASK>\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 </TASK>\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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/caif/caif_usb.c"
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],
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"versions": [
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{
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"status": "affected",
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"lessThan": "3f14457e1584224f4296af613bbd99deb60b5d91",
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"status": "affected",
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},
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{
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"version": "7ad65bf68d705b445ef10b77ab50dab22be185ee",
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"lessThan": "287027d8a567168a5d8ce5cb0cba16a34791a48c",
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"status": "affected",
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{
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"version": "7ad65bf68d705b445ef10b77ab50dab22be185ee",
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"lessThan": "d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179",
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"status": "affected",
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{
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"version": "7ad65bf68d705b445ef10b77ab50dab22be185ee",
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"lessThan": "9781e98a97110f5e76999058368b4be76a788484",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/caif/caif_usb.c"
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],
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"versions": [
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{
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"version": "3.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.14.310",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.19.278",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.237",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.175",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.103",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.20",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.2.7",
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"lessThanOrEqual": "6.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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"operator": "OR",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/68a45c3cf0e2242a533657f4f535d9b6a7447a79"
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},
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{
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"url": "https://git.kernel.org/stable/c/1793da97a23e31c5bf06631f3f3e5a25f368fd64"
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},
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{
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"url": "https://git.kernel.org/stable/c/9dc16be373b382ddd4c274052a6e870a95e76c01"
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},
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{
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"url": "https://git.kernel.org/stable/c/c3aaec463a632cf4187dc017e421bfa69d7834a9"
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},
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{
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"url": "https://git.kernel.org/stable/c/3f14457e1584224f4296af613bbd99deb60b5d91"
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},
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{
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"url": "https://git.kernel.org/stable/c/287027d8a567168a5d8ce5cb0cba16a34791a48c"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1a11bbdbb5ea9f172019c5a4a3e9d8eabd72179"
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},
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{
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"url": "https://git.kernel.org/stable/c/9781e98a97110f5e76999058368b4be76a788484"
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}
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],
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"title": "net: caif: Fix use-after-free in cfusbl_device_notify()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |