CVE-2023-53474

x86/MCE/AMD: Use an u64 for bank_map

State: Published
Severity: 7.8 High
Published: Oct 1, 2025
Updated: Oct 15, 2026
Reserved: Oct 1, 2025

Description

In 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. ]

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	a0bc32b3cacf194dc479b342f006203fd1e1941a to before a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83Affected a0bc32b3cacf194dc479b342f006203fd1e1941a to before 11c58a0c1937c157dbdf82d5ab634d68c99f3098Affected a0bc32b3cacf194dc479b342f006203fd1e1941a to before ba8ffb1251eb629c2ec35220e3896cf4f7b888a7Affected a0bc32b3cacf194dc479b342f006203fd1e1941a to before 9669fa17287c3af2bbd4868d4c8fdd9e57f8332eAffected a0bc32b3cacf194dc479b342f006203fd1e1941a to before 67bb7521b6420d81dab7538c0686f18f7d6d09f4Affected a0bc32b3cacf194dc479b342f006203fd1e1941a to before 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156Affected
LinuxLinux	5.10Affected before 5.10Not affected 5.10.180 through 5.10.Not affected 5.15.111 through 5.15.Not affected 6.1.28 through 6.1.Not affected 6.2.15 through 6.2.Not affected 6.3.2 through 6.3.*Not affected 6.4 and laterNot affected

Product

Versions

LinuxLinux

a0bc32b3cacf194dc479b342f006203fd1e1941a to before a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83Affected
a0bc32b3cacf194dc479b342f006203fd1e1941a to before 11c58a0c1937c157dbdf82d5ab634d68c99f3098Affected
a0bc32b3cacf194dc479b342f006203fd1e1941a to before ba8ffb1251eb629c2ec35220e3896cf4f7b888a7Affected
a0bc32b3cacf194dc479b342f006203fd1e1941a to before 9669fa17287c3af2bbd4868d4c8fdd9e57f8332eAffected
a0bc32b3cacf194dc479b342f006203fd1e1941a to before 67bb7521b6420d81dab7538c0686f18f7d6d09f4Affected
a0bc32b3cacf194dc479b342f006203fd1e1941a to before 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156Affected

LinuxLinux

5.10Affected
before 5.10Not affected
5.10.180 through 5.10.*Not affected
5.15.111 through 5.15.*Not affected
6.1.28 through 6.1.*Not affected
6.2.15 through 6.2.*Not affected
6.3.2 through 6.3.*Not affected
6.4 and laterNot affected

References

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