Description
In the Linux kernel, the following vulnerability has been resolved: s390/sclp: Fix SCCB present check Tracing code called by the SCLP interrupt handler contains early exits if the SCCB address associated with an interrupt is NULL. This check is performed after physical to virtual address translation. If the kernel identity mapping does not start at address zero, the resulting virtual address is never zero, so that the NULL checks won't work. Subsequently this may result in incorrect accesses to the first page of the identity mapping. Fix this by introducing a function that handles the NULL case before address translation.
Affected products
linux: linux kernel; debian: debian linux
References7
- git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a Patch
- git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081 Patch
- git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5 Patch
- git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7 Patch
- git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b Patch
- lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
- cert-portal.siemens.com/productcert/html/ssa-032379.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 6 · as of 8 November 2026
- CWE
- CWE-476
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