221 lines
13 KiB
JSON
221 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-2024-40925",
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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": "2024-07-12T12:17:45.582Z",
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"datePublished": "2024-07-12T12:25:05.747Z",
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"dateUpdated": "2026-08-05T11:34:04.175Z"
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},
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"dateUpdated": "2026-08-05T11:34:04.175Z"
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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\nblock: fix request.queuelist usage in flush\n\nFriedrich Weber reported a kernel crash problem and bisected to commit\n81ada09cc25e (\"blk-flush: reuse rq queuelist in flush state machine\").\n\nThe root cause is that we use \"list_move_tail(&rq->queuelist, pending)\"\nin the PREFLUSH/POSTFLUSH sequences. But rq->queuelist.next == xxx since\nit's popped out from plug->cached_rq in __blk_mq_alloc_requests_batch().\nWe don't initialize its queuelist just for this first request, although\nthe queuelist of all later popped requests will be initialized.\n\nFix it by changing to use \"list_add_tail(&rq->queuelist, pending)\" so\nrq->queuelist doesn't need to be initialized. It should be ok since rq\ncan't be on any list when PREFLUSH or POSTFLUSH, has no move actually.\n\nPlease note the commit 81ada09cc25e (\"blk-flush: reuse rq queuelist in\nflush state machine\") also has another requirement that no drivers would\ntouch rq->queuelist after blk_mq_end_request() since we will reuse it to\nadd rq to the post-flush pending list in POSTFLUSH. If this is not true,\nwe will have to revert that commit IMHO.\n\nThis updated version adds \"list_del_init(&rq->queuelist)\" in flush rq\ncallback since the dm layer may submit request of a weird invalid format\n(REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH), which causes double list_add\nif without this \"list_del_init(&rq->queuelist)\". The weird invalid format\nproblem should be fixed in dm layer."
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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 vulnerable path is reached only through local I/O submission — `io_uring_enter(2)` with a multi-SQE batch is the sole caller of `blk_start_plug_nr_ios()`, which is what enables the batched request allocation that leaves `rq->queuelist` uninitialized. No network protocol handler reaches `blk_mq_get_new_requests()` with `plug->nr_ios > 1`.\nAC:L - No race is involved: the attacker deterministically controls both the io_uring batch size (making `plug->nr_ios > 1`) and the ordering that puts a flush/FUA bio first in the plug, and write-cache-without-FUA queues (dm/LVM, virtio-blk, SATA/SCSI) are the common default. Tag pressure needed to force the NULL-`next` variant is also attacker-generated by keeping the device queue busy.\nPR:L - Any unprivileged local user with io_uring available (default on mainline) and a writable file or block-backed filesystem can submit the required batch; no capability, CAP_SYS_ADMIN, or device-management privilege is needed. A confined container user with a dm-backed overlay qualifies equally.\nUI:N - The attacker triggers the corrupted `list_move_tail()` entirely from their own io_uring submissions; no victim action, mount, or administrator step is required.\nS:U - The corruption and its consequences stay within the host kernel's own security authority — kernel heap/list state and block-layer request structures. No hypervisor, IOMMU, or sandbox boundary is crossed by the defect itself.\nC:H - This is real memory corruption, not a bare NULL dereference: `__list_del()` writes a kernel address into a stale `struct request`, and the double-`list_add` on the flush pending list can truncate or loop that list so `flush_end_io()`/`blk_kick_flush()` dereference and re-process requests that have already been ended, yielding use-after-free reads of request/tag state and cross-I/O data exposure into user buffers.\nI:H - The bug gives an uncontrolled kernel-pointer store (`next->prev = prev`) into a stale `struct request` plus corruption of the flush pending list, which can drive `blk_mq_end_request()` on an already-completed request — a tag double-free and request reuse, i.e. a use-after-free primitive over block-layer objects with attacker-influenced heap contents and on-disk data written to the wrong request.\nA:H - The originally reported symptom is a kernel crash: the NULL-`next` variant faults at address 0x8 while holding `fq->mq_flush_lock` with interrupts disabled, and the list-corruption variant orphans pending flush requests so their submitters hang in D state forever with tags never released, stalling the whole device queue."
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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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"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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"block/blk-flush.c"
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"versions": [
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"version": "6.6",
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"version": "0",
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"lessThan": "6.6",
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"status": "unaffected",
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"versionType": "semver"
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"version": "6.6.35",
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"lessThanOrEqual": "6.6.*",
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{
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"version": "6.9.6",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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"version": "6.10",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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