{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2023-53501",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-10-01T11:39:39.404Z",
        "datePublished": "2025-10-01T11:45:52.204Z",
        "dateUpdated": "2026-05-11T19:46:13.112Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T19:46:13.112Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind\n\nWhen unbinding pasid - a race condition exists vs outstanding page faults.\n\nTo prevent this, the pasid_state object contains a refcount.\n    * set to 1 on pasid bind\n    * incremented on each ppr notification start\n    * decremented on each ppr notification done\n    * decremented on pasid unbind\n\nSince refcount_dec assumes that refcount will never reach 0:\n  the current implementation causes the following to be invoked on\n  pasid unbind:\n        REFCOUNT_WARN(\"decrement hit 0; leaking memory\")\n\nFix this issue by changing refcount_dec to refcount_dec_and_test\nto explicitly handle refcount=1."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iommu/amd/iommu_v2.c"
                    ],
                    "versions": [
                        {
                            "version": "8bc54824da4e8fcf0ed679cf09ac32f23d83254a",
                            "lessThan": "a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8bc54824da4e8fcf0ed679cf09ac32f23d83254a",
                            "lessThan": "13ed255248dfbbb7f23f9170c7a537fb9ca22c73",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8bc54824da4e8fcf0ed679cf09ac32f23d83254a",
                            "lessThan": "9ccc51be3126b25cfe9351dbffde946c925cc28a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8bc54824da4e8fcf0ed679cf09ac32f23d83254a",
                            "lessThan": "98d86bf32187db27946ca817c2467a5f2f7aa02f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8bc54824da4e8fcf0ed679cf09ac32f23d83254a",
                            "lessThan": "534103bcd52ca9c1fecbc70e717b4a538dc4ded8",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iommu/amd/iommu_v2.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.132",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.53",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.4.16",
                            "lessThanOrEqual": "6.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.5.3",
                            "lessThanOrEqual": "6.5.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6",
                            "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": "5.15",
                                    "versionEndExcluding": "5.15.132"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.1.53"
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                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.4.16"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionStartIncluding": "5.15",
                                    "versionEndExcluding": "6.6"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22"
                },
                {
                    "url": "https://git.kernel.org/stable/c/13ed255248dfbbb7f23f9170c7a537fb9ca22c73"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9ccc51be3126b25cfe9351dbffde946c925cc28a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/98d86bf32187db27946ca817c2467a5f2f7aa02f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/534103bcd52ca9c1fecbc70e717b4a538dc4ded8"
                }
            ],
            "title": "iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind",
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