303 lines
15 KiB
JSON
303 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2021-47124",
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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": "2024-03-04T18:12:48.839Z",
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"datePublished": "2024-03-15T20:14:29.605Z",
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"dateUpdated": "2026-08-05T08:46:08.931Z"
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},
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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\nio_uring: fix link timeout refs\n\nWARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28\nRIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28\nCall Trace:\n __refcount_sub_and_test include/linux/refcount.h:283 [inline]\n __refcount_dec_and_test include/linux/refcount.h:315 [inline]\n refcount_dec_and_test include/linux/refcount.h:333 [inline]\n io_put_req fs/io_uring.c:2140 [inline]\n io_queue_linked_timeout fs/io_uring.c:6300 [inline]\n __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354\n io_submit_sqe fs/io_uring.c:6534 [inline]\n io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660\n __do_sys_io_uring_enter fs/io_uring.c:9240 [inline]\n __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182\n\nio_link_timeout_fn() should put only one reference of the linked timeout\nrequest, however in case of racing with the master request's completion\nfirst io_req_complete() puts one and then io_put_req_deferred() is\ncalled."
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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 in io_uring's linked-timeout hrtimer path (io_link_timeout_fn), reached only via local io_uring_setup/io_uring_enter syscalls after submitting IORING_OP_LINK_TIMEOUT, not via network packet processing.\nAC:L - The race is between master-request completion and the linked-timeout hrtimer; the attacker controls both sides by choosing the linked operation and timeout duration and can retry until the double-put hits.\nPR:L - Any unprivileged local user can create an io_uring and submit linked timeouts; io_uring_setup has no CAP_SYS_ADMIN gate for this path (CAP_IPC_LOCK is only for locked-memory accounting).\nUI:N - Exploitation requires only the attacker's own io_uring submissions; no victim action such as mounting a filesystem or opening a crafted file is needed.\nS:U - A successful exploit yields corruption or control within the local kernel authority (typical local privilege escalation), not a cross-boundary escape such as guest-to-host or IOMMU bypass.\nC:H - The bug double-puts the linked-timeout io_kiocb (atomic_t refs, no saturation), freeing it then touching it again—a use-after-free that can be reused for arbitrary kernel memory disclosure.\nI:H - Use-after-free of a slab-allocated io_kiocb enables heap reuse and write primitives suitable for control-flow hijacking or arbitrary kernel memory modification, as with related io_uring linked-timeout UAFs.\nA:H - The double-put underflows request refs and can free or corrupt the object while still in use, reliably causing kernel warnings, oopses, or crashes (and worse under exploitation)."
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}
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