252 lines
13 KiB
JSON
252 lines
13 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-2021-47163",
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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": "2024-03-25T09:12:14.109Z",
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"datePublished": "2024-03-25T09:16:16.676Z",
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"dateUpdated": "2026-08-05T08:46:27.215Z"
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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": "2026-08-05T08:46:27.215Z"
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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\ntipc: wait and exit until all work queues are done\n\nOn some host, a crash could be triggered simply by repeating these\ncommands several times:\n\n # modprobe tipc\n # tipc bearer enable media udp name UDP1 localip 127.0.0.1\n # rmmod tipc\n\n [] BUG: unable to handle kernel paging request at ffffffffc096bb00\n [] Workqueue: events 0xffffffffc096bb00\n [] Call Trace:\n [] ? process_one_work+0x1a7/0x360\n [] ? worker_thread+0x30/0x390\n [] ? create_worker+0x1a0/0x1a0\n [] ? kthread+0x116/0x130\n [] ? kthread_flush_work_fn+0x10/0x10\n [] ? ret_from_fork+0x35/0x40\n\nWhen removing the TIPC module, the UDP tunnel sock will be delayed to\nrelease in a work queue as sock_release() can't be done in rtnl_lock().\nIf the work queue is schedule to run after the TIPC module is removed,\nkernel will crash as the work queue function cleanup_beareri() code no\nlonger exists when trying to invoke it.\n\nTo fix it, this patch introduce a member wq_count in tipc_net to track\nthe numbers of work queues in schedule, and wait and exit until all\nwork queues are done in tipc_exit_net()."
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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 bug is reached via local tipc generic-netlink bearer enable/disable and netns teardown (or local rmmod of tipc); it is not triggered by processing unsolicited remote TIPC/UDP packets.\nAC:L - The attacker controls both sides of the race by enabling a UDP bearer and then destroying the netns (or repeating modprobe/enable/rmmod), so the pending cleanup_bearer work is reliably left running after tipc_exit_net returns.\nPR:L - At the time of this bug, TIPCv2 bearer mutators lacked GENL_ADMIN_PERM, and an unprivileged user can create a user+net namespace (unshare -Urn) and enable a tipc UDP bearer whenever tipc is loaded; CAP_NET_ADMIN in a userns is also Low per guidance.\nUI:N - No victim action is required; the attacker enables the bearer and tears down their own netns (or unloads tipc) entirely on their own.\nS:U - Impact is a host-kernel use-after-free/crash within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossing.\nC:H - tipc_exit_net returns without waiting for cleanup_bearer while kernel UDP sockets hold no netns refcount, so the work runs against freed net/module state; this UAF can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF (and the module-unload path that invokes freed cleanup_bearer text via the workqueue) is memory corruption exploitable for write primitives and control-flow hijacking, not merely a clean crash.\nA:H - The reported failure is a kernel paging-request oops when the workqueue runs after tipc teardown/unload, and the netns UAF path likewise causes kernel crashes."
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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/tipc/core.c",
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"net/tipc/core.h",
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"net/tipc/udp_media.c"
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"net/tipc/core.c",
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"net/tipc/core.h",
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"net/tipc/udp_media.c"
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],
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"versions": [
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"version": "4.1",
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"version": "0",
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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": "5.4.124",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.42",
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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": "5.12.9",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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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"title": "tipc: wait and exit until all work queues are done",
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