01 Record

CVE-2023-53438

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

MediumPUBLISHEDCNA: Linux

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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02 Description

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

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.14% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 3.4% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-09-18 16:04Z1 YR AGO

Last updated

2026-05-11 19:44Z5 MO AGO

Reserved

2025-09-17

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.2

Document digest

a270c87857c12ced6acc87682d954a81c94dd7d9392d9c8add8e42974e9867d0

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e6e6a5f50f58fadec397b23064b7e4830292863d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6eac3965901489ae114a664a78cd2d1415d1af5c, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2e01bdf7203c383e9d8489d9f963c52d6c81e4db, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4240e2ebe67941ce2c4f5c866c3af4b5ac7a0c67, 2.6.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/e6e6a5f50f58fadec397b23064b7e4830292863d
git.kernel.orghttps://git.kernel.org/stable/c/6eac3965901489ae114a664a78cd2d1415d1af5c
git.kernel.orghttps://git.kernel.org/stable/c/2e01bdf7203c383e9d8489d9f963c52d6c81e4db
git.kernel.orghttps://git.kernel.org/stable/c/4240e2ebe67941ce2c4f5c866c3af4b5ac7a0c67

07 Fixed in

Debian 12

linux
Fixed in 6.1.55-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.5.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.5.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.