159 lines
9.8 KiB
JSON
159 lines
9.8 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-2023-53531",
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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": "2025-10-01T11:39:39.408Z",
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"datePublished": "2025-10-01T11:46:15.949Z",
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"dateUpdated": "2026-08-05T09:14:38.269Z"
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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": "2026-08-05T09:14:38.269Z"
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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\nnull_blk: fix poll request timeout handling\n\nWhen doing io_uring benchmark on /dev/nullb0, it's easy to crash the\nkernel if poll requests timeout triggered, as reported by David. [1]\n\nBUG: kernel NULL pointer dereference, address: 0000000000000008\nWorkqueue: kblockd blk_mq_timeout_work\nRIP: 0010:null_timeout_rq+0x4e/0x91\nCall Trace:\n ? null_timeout_rq+0x4e/0x91\n blk_mq_handle_expired+0x31/0x4b\n bt_iter+0x68/0x84\n ? bt_tags_iter+0x81/0x81\n __sbitmap_for_each_set.constprop.0+0xb0/0xf2\n ? __blk_mq_complete_request_remote+0xf/0xf\n bt_for_each+0x46/0x64\n ? __blk_mq_complete_request_remote+0xf/0xf\n ? percpu_ref_get_many+0xc/0x2a\n blk_mq_queue_tag_busy_iter+0x14d/0x18e\n blk_mq_timeout_work+0x95/0x127\n process_one_work+0x185/0x263\n worker_thread+0x1b5/0x227\n\nThis is indeed a race problem between null_timeout_rq() and null_poll().\n\nnull_poll()\t\t\t\tnull_timeout_rq()\n spin_lock(&nq->poll_lock)\n list_splice_init(&nq->poll_list, &list)\n spin_unlock(&nq->poll_lock)\n\n while (!list_empty(&list))\n req = list_first_entry()\n list_del_init()\n ...\n blk_mq_add_to_batch()\n // req->rq_next = NULL\n\t\t\t\t\tspin_lock(&nq->poll_lock)\n\n\t\t\t\t\t// rq->queuelist->next == NULL\n\t\t\t\t\tlist_del_init(&rq->queuelist)\n\n\t\t\t\t\tspin_unlock(&nq->poll_lock)\n\nFix these problems by setting requests state to MQ_RQ_COMPLETE under\nnq->poll_lock protection, in which null_timeout_rq() can safely detect\nthis race and early return.\n\nNote this patch just fix the kernel panic when request timeout happen.\n\n[1] https://lore.kernel.org/all/3893581.1691785261@warthog.procyon.org.uk/"
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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 - Exploitation requires opening the local block device /dev/nullb0 and issuing polled direct I/O (io_uring IOPOLL or preadv2 RWF_HIPRI); there is no remote or adjacent-network path into null_blk.\nAC:L - The attacker controls both sides of the race — it submits the polled requests, controls when it calls into null_poll(), and the 5-second timeout is fixed unconditionally by null_add_dev() (tag_set->timeout = 5 * HZ), so the collision with blk_mq_timeout_work can be arranged deterministically and retried; the fix author notes it is \"easy to crash the kernel.\"\nPR:L - The vulnerable path contains no capability or namespace check — any local user able to open the null_blk device node (group disk, benchmarking/CI accounts, or a container handed the device) can reach null_queue_rq/null_poll with ordinary O_DIRECT reads.\nUI:N - The attacker performs the submissions and polling itself; no victim action is required to trigger the race.\nS:U - The corruption is confined to kernel block-layer structures within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Beyond the NULL case, list_del_init() writes &rq->queuelist into the io_comp_batch chain, so blk_mq_end_request_batch() dereferences a bogus struct request and bio pointers, and the double blk_mq_complete_request() frees the tag twice yielding request reuse — a UAF-class read primitive over kernel heap contents.\nI:H - The race produces doubly-linked-list corruption plus double request completion (tag double-free and reallocation to a concurrent I/O), giving attacker-influenced kernel heap writes exploitable for control-flow hijacking.\nA:H - The documented result is a kernel NULL pointer dereference oops at address 0x8 inside blk_mq_timeout_work on the kblockd workqueue, killing the worker and panicking or wedging the block layer."
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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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"drivers/block/null_blk/main.c"
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],
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"versions": [
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{
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"version": "0a593fbbc245a85940ed34caa3aa1e4cb060c54b",
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"lessThan": "a0b4a0666beacfe8add9c71d8922475541dbae73",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a593fbbc245a85940ed34caa3aa1e4cb060c54b",
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"lessThan": "a7cb2e709f2927cc3c76781df3e45de2381b3b9d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a593fbbc245a85940ed34caa3aa1e4cb060c54b",
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"lessThan": "5a26e45edb4690d58406178b5a9ea4c6dcf2c105",
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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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"drivers/block/null_blk/main.c"
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],
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"versions": [
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{
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"version": "5.16",
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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": "5.16",
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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": "6.1.54",
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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": "6.5.4",
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"lessThanOrEqual": "6.5.*",
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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": "6.6",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.16",
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"versionEndExcluding": "6.1.54"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.16",
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.16",
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a0b4a0666beacfe8add9c71d8922475541dbae73"
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},
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{
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"url": "https://git.kernel.org/stable/c/a7cb2e709f2927cc3c76781df3e45de2381b3b9d"
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},
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{
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"url": "https://git.kernel.org/stable/c/5a26e45edb4690d58406178b5a9ea4c6dcf2c105"
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}
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],
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"title": "null_blk: fix poll request timeout handling",
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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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} |