CVE-2023-53474

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There is no network-facing or adjacent-network path, and KVM caps guests at 32 MCA banks so the condition is not reachable from a guest.\nAC:L - On an affected system (AMD CPU whose MCG_CAP reports more than 32 MCA banks, as MAX_NR_BANKS=64 was raised to support), the out-of-range shift is hit deterministically on every CPU bring-up with no race, timing window, or memory-layout dependency. Consistent with the scoring of other hardware-model-specific arch/x86/kernel/cpu defects, the platform precondition is treated as the vulnerable configuration rather than as added complexity.\nPR:L - The buggy bitmap handling executes during boot with no privileges at all, and the misprogrammed threshold banks/MSR addresses it produces are subsequently exercised through the low-privilege local surface; re-triggering it deliberately via CPU offline/online needs only local access to the machine. A basic local user is the lowest-privileged actor on such a system, so PR:L rather than PR:H.\nUI:N - The defect is triggered automatically by kernel CPU initialization and the hotplug/thresholding paths; no victim has to open a file, mount anything, or take any other action.\nS:U - The corruption is confined to the kernel's own per-CPU MCE bookkeeping and MSR programming within the same security authority. No VM, IOMMU, or sandbox boundary is crossed \u2014 the KVM MCE bank limit of 32 rules out a guest-to-host angle.\nC:H - The aliased `smca_misc_banks_map` makes `smca_get_block_address()` hand back MISCy MSR addresses for banks that have no such registers, and `allocate_threshold_blocks()` recurses over and reads those out-of-range MCA register addresses, exposing hardware state that belongs to unrelated banks through the threshold block objects. Undefined shift behaviour additionally lets the compiler assume `bank < 32`, so the resulting indexing is not reliably bounded.\nI:H - `threshold_restart_bank()` performs an unguarded `wrmsr()` on the mis-derived `b->address`, so MCA threshold, LVT-offset and control registers of the wrong bank get overwritten, and the aliased `bank_map` enables/disables thresholding and deferred-error reporting for banks other than the intended ones. This is attacker-influenceable kernel-controlled machine state written to the wrong target.\nA:H - The same mis-derived address reaches the unguarded `rdmsr()`/`wrmsr()` in `threshold_restart_bank()`, where a non-existent MSR raises an unhandled `#GP` in kernel context and panics the machine, and with `CONFIG_UBSAN_TRAP=y` the shift-out-of-bounds itself traps during CPU bring-up. Beyond the crash, the corrupted `bank_map` breaks MCA thresholding for banks \u226532 so genuine uncorrectable hardware errors are misconfigured or unhandled."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kernel/cpu/mce/amd.c"], "versions": [{"version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83", "status": "affected", "versionType": "git"}, {"version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "11c58a0c1937c157dbdf82d5ab634d68c99f3098", "status": "affected", "versionType": "git"}, {"version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "ba8ffb1251eb629c2ec35220e3896cf4f7b888a7", "status": "affected", "versionType": "git"}, {"version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "9669fa17287c3af2bbd4868d4c8fdd9e57f8332e", "status": "affected", "versionType": "git"}, {"version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "67bb7521b6420d81dab7538c0686f18f7d6d09f4", "status": "affected", "versionType": "git"}, {"version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kernel/cpu/mce/amd.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.180", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.111", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.28", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.15", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3.2", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4", "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": "5.10", "versionEndExcluding": "5.10.180"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.28"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.2.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.3.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83"}, {"url": "https://git.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098"}, {"url": "https://git.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7"}, {"url": "https://git.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332e"}, {"url": "https://git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4"}, {"url": "https://git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156"}], "title": "x86/MCE/AMD: Use an u64 for bank_map", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-53474", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:34:40.536216Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:28.463Z"}}]}}

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There is no network-facing or adjacent-network path, and KVM caps guests at 32 MCA banks so the condition is not reachable from a guest.\nAC:L - On an affected system (AMD CPU whose MCG_CAP reports more than 32 MCA banks, as MAX_NR_BANKS=64 was raised to support), the out-of-range shift is hit deterministically on every CPU bring-up with no race, timing window, or memory-layout dependency. Consistent with the scoring of other hardware-model-specific arch/x86/kernel/cpu defects, the platform precondition is treated as the vulnerable configuration rather than as added complexity.\nPR:L - The buggy bitmap handling executes during boot with no privileges at all, and the misprogrammed threshold banks/MSR addresses it produces are subsequently exercised through the low-privilege local surface; re-triggering it deliberately via CPU offline/online needs only local access to the machine. A basic local user is the lowest-privileged actor on such a system, so PR:L rather than PR:H.\nUI:N - The defect is triggered automatically by kernel CPU initialization and the hotplug/thresholding paths; no victim has to open a file, mount anything, or take any other action.\nS:U - The corruption is confined to the kernel's own per-CPU MCE bookkeeping and MSR programming within the same security authority. No VM, IOMMU, or sandbox boundary is crossed \u2014 the KVM MCE bank limit of 32 rules out a guest-to-host angle.\nC:H - The aliased `smca_misc_banks_map` makes `smca_get_block_address()` hand back MISCy MSR addresses for banks that have no such registers, and `allocate_threshold_blocks()` recurses over and reads those out-of-range MCA register addresses, exposing hardware state that belongs to unrelated banks through the threshold block objects. Undefined shift behaviour additionally lets the compiler assume `bank < 32`, so the resulting indexing is not reliably bounded.\nI:H - `threshold_restart_bank()` performs an unguarded `wrmsr()` on the mis-derived `b->address`, so MCA threshold, LVT-offset and control registers of the wrong bank get overwritten, and the aliased `bank_map` enables/disables thresholding and deferred-error reporting for banks other than the intended ones. This is attacker-influenceable kernel-controlled machine state written to the wrong target.\nA:H - The same mis-derived address reaches the unguarded `rdmsr()`/`wrmsr()` in `threshold_restart_bank()`, where a non-existent MSR raises an unhandled `#GP` in kernel context and panics the machine, and with `CONFIG_UBSAN_TRAP=y` the shift-out-of-bounds itself traps during CPU bring-up. Beyond the crash, the corrupted `bank_map` breaks MCA thresholding for banks \u226532 so genuine uncorrectable hardware errors are misconfigured or unhandled."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83", "versionType": "git"}, {"status": "affected", "version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "11c58a0c1937c157dbdf82d5ab634d68c99f3098", "versionType": "git"}, {"status": "affected", "version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "ba8ffb1251eb629c2ec35220e3896cf4f7b888a7", "versionType": "git"}, {"status": "affected", "version": "a0bc32b3cacf194dc479b342f006203fd1e1941a", "lessThan": "9669fa17287c3af2bbd4868d4c8fdd9e57f8332e", "versionType": "git"}, {"status": "affected", "version": 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resolved:\n\nx86/MCE/AMD: Use an u64 for bank_map\n\nThee maximum number of MCA banks is 64 (MAX_NR_BANKS), see\n\n a0bc32b3cacf (\"x86/mce: Increase maximum number of banks to 64\").\n\nHowever, the bank_map which contains a bitfield of which banks to\ninitialize is of type unsigned int and that overflows when those bit\nnumbers are >= 32, leading to UBSAN complaining correctly:\n\n UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38\n shift exponent 32 is too large for 32-bit type 'int'\n\nChange the bank_map to a u64 and use the proper BIT_ULL() macro when\nmodifying bits in there.\n\n [ bp: Rewrite commit message. ]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.180", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.111", 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"3844A90B-940D-46C3-8D7B-9FF63F1AFC2F", "versionEndExcluding": "6.2.15", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "38F6F330-91A0-4675-8B90-6F950471A7CC", "versionEndExcluding": "6.3.2", "versionStartIncluding": "6.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/MCE/AMD: Use an u64 for bank_map\n\nThee maximum number of MCA banks is 64 (MAX_NR_BANKS), see\n\n a0bc32b3cacf (\"x86/mce: Increase maximum number of banks to 64\").\n\nHowever, the bank_map which contains a bitfield of which banks to\ninitialize is of type unsigned int and that overflows when those bit\nnumbers are >= 32, leading to UBSAN complaining correctly:\n\n UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38\n shift exponent 32 is too large for 32-bit type 'int'\n\nChange the bank_map to a u64 and use the proper BIT_ULL() macro when\nmodifying bits in there.\n\n [ bp: Rewrite commit message. ]"}], "id": "CVE-2023-53474", "lastModified": "2026-10-15T22:17:40.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53474", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:34:40.536216Z", "version": "2.0.3"}}]}, "published": "2025-10-01T12:15:49.687", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: x86/MCE/AMD: Use an u64 for bank_map", "id": "2400818", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400818"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53474", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53474\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53474\nhttps://lore.kernel.org/linux-cve-announce/2025100110-CVE-2023-53474-b2ae@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-10-02T08:39:55.990329+00:00", "updated": "2025-10-02T08:39:55.990378+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}