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CVE record · CVE-2021-26356

Time-of-check time-of-use race condition in AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4 and others

CVSS 7.4 HighEPSS 0.0040 · 34th percentile

Published by the CVE Program (CNA: AMD) at 9 May 2023, 18:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4 Package name: AGESA
  • affected various
Other versions: unaffected
AMD AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4 Package name: AGESA
  • affected various
Other versions: unaffected
AMD 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT Package name: AGESA
  • affected various
Other versions: unaffected
AMD Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS Package name: AGESA
  • affected various
Other versions: unaffected
AMD Ryzen™ Threadripper™ PRO Processors “Chagall” WS Package name: AGESA
  • affected various
Other versions: unaffected
AMD 1st Gen AMD EPYC™ Processors Package name: AGESA
  • affected various
Other versions: unaffected
AMD 2nd Gen AMD EPYC™ Processors Package name: AGESA
  • affected various
Other versions: unaffected
AMD 3rd Gen AMD EPYC™ Processors Package name: AGESA
  • affected various
Other versions: unaffected
Identifiers
CVE-2021-26356
CNA
AMD
Weakness (CWE)
CWE-367
Tags
Published
9 May 2023
Updated
28 Jan 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.4 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N ADP (CISA-ADP)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 May 2023. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.