CVE-2026-80709

s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs

CVE-2026-80709 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-80709, released August 29, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

9.8

Critical

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0018

7th percentile

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs There is a wrong upper limit check for the domain value when an EP11 CPRB is processed for sending to a crypto card. This check is only active on custom device nodes but may lead to access heap memory behind perms->adm when an administrative CPRB is sent. Add correct limit (AP_DOMAINS = 256) checking to fix this.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 12.15 (bookworm)	6.1.187-1	DEBIAN-CVE-2026-80709	Aug 29, 2026
linux · Debian 13.5 (trixie)	6.12.105-1	DEBIAN-CVE-2026-80709	Aug 29, 2026
linux · Debian 14	7.1.8-1	DEBIAN-CVE-2026-80709	Aug 29, 2026
linux-6.12 · Debian 12.15 (bookworm)	6.12.107-1~deb12u1	DEBIAN-CVE-2026-80709	Aug 29, 2026

Details

Published
August 28, 2026
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80709

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