{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53162",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.388Z",
        "datePublished": "2026-06-25T08:38:43.453Z",
        "dateUpdated": "2026-08-05T12:33:37.176Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:33:37.176Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "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."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/memcontrol.c"
                    ],
                    "versions": [
                        {
                            "version": "f735eebe55f8f61758fe014bd0b02ab50b059e4d",
                            "lessThan": "89bd8215e25aa6999cc51696da418e0d422bc5e0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f735eebe55f8f61758fe014bd0b02ab50b059e4d",
                            "lessThan": "00731bd7e18f182a32ca54d6b176eaa470b51ed7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f735eebe55f8f61758fe014bd0b02ab50b059e4d",
                            "lessThan": "c0cafe24d3f6534294c4b2bc2d47734ff7cbd313",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/memcontrol.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.36",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.13",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.18.36"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.0.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/89bd8215e25aa6999cc51696da418e0d422bc5e0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/00731bd7e18f182a32ca54d6b176eaa470b51ed7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c0cafe24d3f6534294c4b2bc2d47734ff7cbd313"
                }
            ],
            "title": "memcg: use round-robin victim selection in refill_stock",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}