193 lines
10 KiB
JSON
193 lines
10 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-2023-54227",
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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": "2025-12-30T12:06:44.502Z",
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"datePublished": "2025-12-30T12:11:20.207Z",
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"dateUpdated": "2026-10-15T21:41:42.461Z"
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},
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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": "2026-10-03T10:55:05.417Z"
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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\nblk-mq: fix tags leak when shrink nr_hw_queues\n\nAlthough we don't need to realloc set->tags[] when shrink nr_hw_queues,\nwe need to free them. Or these tags will be leaked.\n\nHow to reproduce:\n1. mount -t configfs configfs /mnt\n2. modprobe null_blk nr_devices=0 submit_queues=8\n3. mkdir /mnt/nullb/nullb0\n4. echo 1 > /mnt/nullb/nullb0/power\n5. echo 4 > /mnt/nullb/nullb0/submit_queues\n6. rmdir /mnt/nullb/nullb0\n\nIn step 4, will alloc 9 tags (8 submit queues and 1 poll queue), then\nin step 5, new_nr_hw_queues = 5 (4 submit queues and 1 poll queue).\nAt last in step 6, only these 5 tags are freed, the other 4 tags leaked."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The shrink is driven by remote-peer data on NVMe-oF hosts — `nvme_set_queue_count()` takes the I/O queue count verbatim from the target's Set Features completion and feeds it to `blk_mq_update_nr_hw_queues()` on every reconnect, with the tag set persisting across reconnects. A hostile/compromised target or on-path attacker on an unauthenticated NVMe/TCP fabric reaches the vulnerable code over the network.\nAC:L - The attacker fully controls the granted queue count in each Set Features response and can force reconnects at will by closing the transport connection, so each shrink→grow cycle is triggered deterministically with no conditions outside the attacker's control.\nPR:N - The remote peer needs no credentials on the victim host; NVMe/TCP in the affected 5.16–6.5 range has no in-band authentication or TLS, and the queue-count negotiation happens automatically during controller reconnect.\nUI:N - Reconnect and queue renegotiation are fully automatic in the nvme fabrics keep-alive/reconnect path; no administrator or user action is needed at exploitation time.\nS:U - The leaked allocations and the resulting memory pressure are confined to the kernel of the affected host; no security authority boundary such as a VM or IOMMU domain is crossed.\nC:N - The leaked `blk_mq_tags` and request pages are simply never freed — they are not read, exposed, or transmitted anywhere, so no information is disclosed to the attacker.\nI:N - No out-of-bounds write, use-after-free, or type confusion occurs; the stale pointers are only dropped, leaving no primitive to modify kernel or user data.\nA:H - Because the regrow path memcpy's only the shrunken count and frees the old array, every shrink→grow cycle permanently leaks a full per-queue request pool, making the leak unbounded and repeatable until kernel memory is exhausted and the system OOMs or hangs."
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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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"block/blk-mq.c"
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],
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"versions": [
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{
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"version": "a846a8e6c9a5949582c5a6a8bbc83a7d27fd891e",
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"lessThan": "26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd",
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"status": "affected",
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"versionType": "git"
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{
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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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"block/blk-mq.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": "6.1.189",
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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": "6.5.5",
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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": "6.1.189"
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},
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{
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"vulnerable": true,
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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/26d495f0f64d8cd4fcd29206ee5c653ee0e0cbcd"
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},
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{
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"url": "https://git.kernel.org/stable/c/c0ef7493e68b8896806a2f598fcffbaa97333405"
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},
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{
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"url": "https://git.kernel.org/stable/c/e1dd7bc93029024af5688253b0c05181d6e01f8e"
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}
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],
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"title": "blk-mq: fix tags leak when shrink nr_hw_queues",
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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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"metrics": [
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-54227",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:39:33.828518Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:41:42.461Z"
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}
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}
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]
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}
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} |