CVE-2022-49426

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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 \u2192 arm_smmu_sva_bind \u2192 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"}}]}}

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Call mmgrab()/mmdrop() to\nensure the mm only gets freed after we unpinned the ASID."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.46", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.17.14", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.18.3", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.19", "versionStartIncluding": "5.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:55:11.768Z"}}}, "cveMetadata": {"cveId": "CVE-2022-49426", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:55:11.768Z", "dateReserved": "2025-02-26T02:08:31.569Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-02-26T02:12:47.206Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"affected_release": [{"advisory": "RHSA-2022:7683", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-425.3.1.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-11-08T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: iommu/arm-smmu-v3-sva: Fix mm use-after-free", "id": "2347804", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347804"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niommu/arm-smmu-v3-sva: Fix mm use-after-free\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."], "name": "CVE-2022-49426", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49426\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49426\nhttps://lore.kernel.org/linux-cve-announce/2025022655-CVE-2022-49426-313d@gregkh/T"], "threat_severity": "Moderate"}

{}