High 7.3Published Sep 5, 2025

CVE-2025-39694s390/sclp: Fix SCCB present check

Updated under an hour ago (Oct 27, 2026, 9:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ada1da31ce34248bc97ca8f801f2cf6efa378a81 before aa5073ac1a2a274812f3b04c278992e68ff67cc7; from ada1da31ce34248bc97ca8f801f2cf6efa378a81 before 86c2825791c3836a8f77a954b9c5ebe6fab410c5; from ada1da31ce34248bc97ca8f801f2cf6efa378a81 before 61605c847599fbfdfafe638607841c7d73719081; from ada1da31ce34248bc97ca8f801f2cf6efa378a81 before bf83ae3537359af088d6577812ed93113dfbcb7b; from ada1da31ce34248bc97ca8f801f2cf6efa378a81 before 430fa71027b6ac9bb0ce5532b8d0676777d4219a	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4; 6.17; 6.17	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7	patch
https://git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5	patch
https://git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081	patch
https://git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b	patch
https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-032379.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.