x86/MCE/AMD: Use an u64 for bank_map

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53474
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-01 12:15:49 UTC
Updated2026-08-04 10:19:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: x86/MCE/AMD: Use an u64 for bank_map Thee maximum number of MCA banks is 64 (MAX_NR_BANKS), see a0bc32b3cacf ("x86/mce: Increase maximum number of banks to 64"). However, the bank_map which contains a bitfield of which banks to initialize is of type unsigned int and that overflows when those bit numbers are >= 32, leading to UBSAN complaining correctly: UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38 shift exponent 32 is too large for 32-bit type 'int' Change the bank_map to a u64 and use the proper BIT_ULL() macro when modifying bits in there. [ bp: Rewrite commit message. ]

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-190

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a0bc32b3cacf194dc479b342f006203fd1e1941a a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83 git Not specified
CNA Linux Linux affected a0bc32b3cacf194dc479b342f006203fd1e1941a 11c58a0c1937c157dbdf82d5ab634d68c99f3098 git Not specified
CNA Linux Linux affected a0bc32b3cacf194dc479b342f006203fd1e1941a ba8ffb1251eb629c2ec35220e3896cf4f7b888a7 git Not specified
CNA Linux Linux affected a0bc32b3cacf194dc479b342f006203fd1e1941a 9669fa17287c3af2bbd4868d4c8fdd9e57f8332e git Not specified
CNA Linux Linux affected a0bc32b3cacf194dc479b342f006203fd1e1941a 67bb7521b6420d81dab7538c0686f18f7d6d09f4 git Not specified
CNA Linux Linux affected a0bc32b3cacf194dc479b342f006203fd1e1941a 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156 git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.180 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.111 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.28 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2.15 6.2.* semver Not specified
CNA Linux Linux unaffected 6.3.2 6.3.* semver Not specified
CNA Linux Linux unaffected 6.4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9669fa17287c3af2bbd4868d4c8fdd9e57f8332e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/11c58a0c1937c157dbdf82d5ab634d68c99f3098 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ba8ffb1251eb629c2ec35220e3896cf4f7b888a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/67bb7521b6420d81dab7538c0686f18f7d6d09f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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