CVE-2023-53438

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Source
https://cve.org/CVERecord?id=CVE-2023-53438
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53438.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-53438
Downstream
Related
Published
2025-09-18T16:04:16.501Z
Modified
2026-03-20T12:33:09.511928Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
x86/MCE: Always save CS register on AMD Zen IF Poison errors
Details

In the Linux kernel, the following vulnerability has been resolved:

x86/MCE: Always save CS register on AMD Zen IF Poison errors

The Instruction Fetch (IF) units on current AMD Zen-based systems do not guarantee a synchronous #MC is delivered for poison consumption errors. Therefore, MCG_STATUS[EIPV|RIPV] will not be set. However, the microarchitecture does guarantee that the exception is delivered within the same context. In other words, the exact rIP is not known, but the context is known to not have changed.

There is no architecturally-defined method to determine this behavior.

The Code Segment (CS) register is always valid on such IF unit poison errors regardless of the value of MCG_STATUS[EIPV|RIPV].

Add a quirk to save the CS register for poison consumption from the IF unit banks.

This is needed to properly determine the context of the error. Otherwise, the severity grading function will assume the context is IN_KERNEL due to the m->cs value being 0 (the initialized value). This leads to unnecessary kernel panics on data poison errors due to the kernel believing the poison consumption occurred in kernel context.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53438.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
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
e6e6a5f50f58fadec397b23064b7e4830292863d
Fixed
6eac3965901489ae114a664a78cd2d1415d1af5c
Fixed
2e01bdf7203c383e9d8489d9f963c52d6c81e4db
Fixed
4240e2ebe67941ce2c4f5c866c3af4b5ac7a0c67

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-53438.json"