{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49426", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.569Z", "datePublished": "2025-02-26T02:12:47.206Z", "dateUpdated": "2026-08-05T08:55:11.768Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:11.768Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/arm-smmu-v3-sva: Fix mm use-after-free\n\nWe currently call arm64_mm_context_put() without holding a reference to\nthe mm, which can result in use-after-free. Call mmgrab()/mmdrop() to\nensure the mm only gets freed after we unpinned the ASID." } ], "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 bug is reached only via local SVA bind/unbind on ARM SMMUv3, typically through open/close of a uacce char device (iommu_sva_bind_device → arm_smmu_sva_bind → arm_smmu_alloc_shared_cd / free_shared_cd), not via network packet processing.\nAC:L - An attacker who can open the accelerator device fully controls bind and unbind (open/close or process exit), directly driving the missing-mmgrab UAF path; per kernel UAF guidance this is Low complexity.\nPR:L - No capability check exists on the uacce open path; UACCE is explicitly a user-space accelerator interface, so a normal local user with device-node access (common on HiSilicon/WarpDrive deployments) can trigger the bug without real root.\nUI:N - The attacker triggers the vulnerability themselves by binding and later unbinding SVA; no separate victim action is required.\nS:U - This is a kernel mm_struct use-after-free enabling host privilege escalation within the same OS security authority, not a guest-to-host escape or a direct IOMMU/DMA isolation bypass.\nC:H - Use-after-free of mm_struct while unpinning the ASID lets the attacker reclaim and control the freed object, enabling arbitrary kernel read primitives.\nI:H - The same UAF is exploitable for heap manipulation and arbitrary write / control-flow hijacking in the kernel.\nA:H - Dereferencing the freed mm in arm64_mm_context_put can oops/panic the kernel even without full exploitation, 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": [ "drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c" ], "versions": [ { "version": "32784a9562fb0518b12e9797ee2aec52214adf6f", "lessThan": "fc90f13ea0dcd960e5002d204fa55cec4e0db2fa", "status": "affected", "versionType": "git" }, { "version": "32784a9562fb0518b12e9797ee2aec52214adf6f", "lessThan": "e3cbbdbff8a4db5d053c53fd71be62ccccdb52b0", "status": "affected", "versionType": "git" }, { "version": "32784a9562fb0518b12e9797ee2aec52214adf6f", "lessThan": "9aa215450888cf29af0c479e14a712dc6b0c506c", "status": "affected", "versionType": "git" }, { "version": "32784a9562fb0518b12e9797ee2aec52214adf6f", "lessThan": "cbd23144f7662b00bcde32a938c4a4057e476d68", "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/arm/arm-smmu-v3/arm-smmu-v3-sva.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.46", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.14", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "5.11", "versionEndExcluding": "5.15.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.17.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fc90f13ea0dcd960e5002d204fa55cec4e0db2fa" }, { "url": "https://git.kernel.org/stable/c/e3cbbdbff8a4db5d053c53fd71be62ccccdb52b0" }, { "url": "https://git.kernel.org/stable/c/9aa215450888cf29af0c479e14a712dc6b0c506c" }, { "url": "https://git.kernel.org/stable/c/cbd23144f7662b00bcde32a938c4a4057e476d68" } ], "title": "iommu/arm-smmu-v3-sva: Fix mm use-after-free", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49426", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:16:10.824439Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:22:32.946Z" } } ] } }