159 lines
8.6 KiB
JSON
159 lines
8.6 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-2026-53162",
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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": "2026-06-09T07:44:35.388Z",
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"datePublished": "2026-06-25T08:38:43.453Z",
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"dateUpdated": "2026-08-05T12:33:37.176Z"
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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": "2026-08-05T12:33:37.176Z"
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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\nmemcg: use round-robin victim selection in refill_stock\n\nHarry Yoo reported that get_random_u32_below() is not safe to call in the\nnmi context and memcg charge draining can happen in nmi context.\n\nMore specifically get_random_u32_below() is neither reentrant- nor\nNMI-safe: it acquires a per-cpu local_lock via local_lock_irqsave() on the\nbatched_entropy_u32 state. An NMI that lands on a CPU mid-update of the\nChaCha batch state and recurses into the random subsystem would corrupt\nthat state. The memcg_stock local_trylock prevents re-entry on the percpu\nstock itself, but cannot protect an unrelated subsystem's per-cpu lock.\n\nReplace the random pick with a per-cpu round-robin counter stored in\nmemcg_stock_pcp and serialized by the same local_trylock that already\nguards cached[] and nr_pages[]. No atomics, no random calls, no extra\nlocks needed."
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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 `refill_stock()` path is reached through local kernel activity such as memcg-accounted allocation/free paths and NMI-capable perf/BPF-style execution, not by unauthenticated network packets alone.\nAC:L - An attacker can repeatedly drive memcg stock eviction and high-rate NMI/RNG activity; the race is timing-sensitive but both sides are influenceable from local execution.\nPR:L - Reachability requires a local user context able to create or use memcg-accounted workloads and NMI-capable facilities such as perf/BPF or delegated equivalents, so low privileges are sufficient in a plausible deployment.\nUI:N - No separate victim action is required once the attacker can run the local workload and trigger the accounting/NMI activity.\nS:U - The corrupted state is inside the same kernel security authority; this is not a VM, IOMMU, or sandbox boundary escape by itself.\nC:H - The bug corrupts per-CPU random subsystem batch state used for security-sensitive randomness, so confidentiality impact is high under the required higher-severity assumption.\nI:H - Corruption of kernel RNG state can undermine integrity of random-dependent kernel protections and identifiers, and the vulnerable interleaving includes state writes outside the intended entropy slot.\nA:H - Kernel per-CPU state corruption in NMI context can lead to unpredictable kernel malfunction or hard failure, so availability impact is high."
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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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"mm/memcontrol.c"
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],
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"versions": [
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{
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"version": "f735eebe55f8f61758fe014bd0b02ab50b059e4d",
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"lessThan": "89bd8215e25aa6999cc51696da418e0d422bc5e0",
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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": "f735eebe55f8f61758fe014bd0b02ab50b059e4d",
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"lessThan": "00731bd7e18f182a32ca54d6b176eaa470b51ed7",
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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": "f735eebe55f8f61758fe014bd0b02ab50b059e4d",
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"lessThan": "c0cafe24d3f6534294c4b2bc2d47734ff7cbd313",
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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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"mm/memcontrol.c"
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],
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"versions": [
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{
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"version": "6.16",
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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": "6.16",
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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": "6.18.36",
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"lessThanOrEqual": "6.18.*",
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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": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "6.16",
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"versionEndExcluding": "6.18.36"
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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": "6.16",
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"versionEndExcluding": "7.0.13"
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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": "6.16",
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"versionEndExcluding": "7.1"
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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/89bd8215e25aa6999cc51696da418e0d422bc5e0"
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},
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{
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"url": "https://git.kernel.org/stable/c/00731bd7e18f182a32ca54d6b176eaa470b51ed7"
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},
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{
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"url": "https://git.kernel.org/stable/c/c0cafe24d3f6534294c4b2bc2d47734ff7cbd313"
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}
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],
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"title": "memcg: use round-robin victim selection in refill_stock",
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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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}
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} |