CVE-2023-53474

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Source
https://cve.org/CVERecord?id=CVE-2023-53474
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53474.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-53474
Downstream
Related
Published
2025-10-01T11:42:43Z
Modified
2026-08-12T03:51:18Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
x86/MCE/AMD: Use an u64 for bank_map
Details

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. ]

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53474.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
a0bc32b3cacf194dc479b342f006203fd1e1941a
Fixed
a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83
Fixed
11c58a0c1937c157dbdf82d5ab634d68c99f3098
Fixed
ba8ffb1251eb629c2ec35220e3896cf4f7b888a7
Fixed
9669fa17287c3af2bbd4868d4c8fdd9e57f8332e
Fixed
67bb7521b6420d81dab7538c0686f18f7d6d09f4
Fixed
4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53474.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.10.0
Fixed
5.10.180
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.111
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.28
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.2.15
Type
ECOSYSTEM
Events
Introduced
6.3.0
Fixed
6.3.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53474.json"