Medium severity5.5NVD Advisory· Published Apr 22, 2026· Updated Apr 28, 2026
CVE-2026-31482
CVE-2026-31482
Description
In the Linux kernel, the following vulnerability has been resolved:
s390/entry: Scrub r12 register on kernel entry
Before commit f33f2d4c7c80 ("s390/bp: remove TIF_ISOLATE_BP"), all entry handlers loaded r12 with the current task pointer (lg %r12,__LC_CURRENT) for use by the BPENTER/BPEXIT macros. That commit removed TIF_ISOLATE_BP, dropping both the branch prediction macros and the r12 load, but did not add r12 to the register clearing sequence.
Add the missing xgr %r12,%r12 to make the register scrub consistent across all entry points.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
10cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 9 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.4.1,<6.6.131
- cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
- (no CPE)
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27nvdPatch
- git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909nvdPatch
- git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36nvdPatch
- git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30nvdPatch
- git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159efnvdPatch
News mentions
0No linked articles in our index yet.