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Fencer Vulns
medium 4.4

CVE-2021-26382 json

An attacker with root account privileges can load any legitimately signed firmware image into the Audio Co-Processor (ACP,) irrespective of…

published 2022-07-14 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13188

cvss
4.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

An attacker with root account privileges can load any legitimately signed firmware image into the Audio Co-Processor (ACP,) irrespective of the respective signing key being declared as usable for authenticating an ACP firmware image, potentially resulting in a denial of service.

Patch / fix

  • amd ryzen_7_5700g_firmware comboam4_v2_pi_1.2.0.6c
  • amd ryzen_7_5700ge_firmware comboam4_v2_pi_1.2.0.6c
  • amd ryzen_5_5600g_firmware comboam4_v2_pi_1.2.0.6c
  • amd ryzen_5_5600ge_firmware comboam4_v2_pi_1.2.0.6c
  • amd ryzen_3_5300g_firmware comboam4_v2_pi_1.2.0.6c
  • amd ryzen_3_5300ge_firmware comboam4_v2_pi_1.2.0.6c
  • amd ryzen_9_5980hx_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_9_5980hs_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_7_5825u_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_9_5900hx_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_9_5900hs_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_7_5825c_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_7_5800h_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_5_5625u_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_7_5800hs_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_5_5625c_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_5_5600h_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_5_5600hs_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_7_5800u_firmware cezannepi-fp6_1.0.0.9
  • amd ryzen_5_5600u_firmware cezannepi-fp6_1.0.0.9

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected products

  • AMD Ryzen™ Series
  • AMD Athlon™ Series

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.