Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Linux Linux — KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U H H H 7.8 .0017 6.3 —
AFFECTED
Product Versions Fixed
Linux 87e28a15c42cc592009c32a8c20e5789059027c2 – —
Linux 5.13 – 5.15.121
TIMELINE
Sep 15 Reserved by Linux
Sep 15 Published (CNA: Linux)
Aug 4 RESCORED — CVE-2023-53205 (Linux). CVSS 7.3 → 7.8 (NVD).
Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler
We do check for target CPU == -1, but this might change at the time we
are going to use it. Hold the physical target CPU in a local variable to
avoid out-of-bound accesses to the cpu arrays.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
| September 15, 2025 | Reserved | Reserved by Linux |
| September 15, 2025 | Published | Published (CNA: Linux) |
| August 4, 2026 | RESCORED | RESCORED — CVE-2023-53205 (Linux). CVSS 7.3 → 7.8 (NVD). |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
| Linux | Linux | — | 87e28a15c42cc592009c32a8c20e5789059027c2 | — |
| Linux | Linux | — | 5.13 | 5.15.121 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2023-53205 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.