Description
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.
References6
- git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5
- git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15
- git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa
- git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76
- git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5
- git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 7 · as of 8 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.