CVE-2026-31482

The CVE-2026-31482 issue affects the Linux kernel on s390, where r12 was not scrubbed on kernel entry due to an incomplete update in the s390 entry path. The root cause is that, after removing TIF_ISOLATE_BP, the register-clearing sequence failed to include the xgr %r12,%r12 scrub, leaving the cu...

CVE-2026-31482 s390/entry: Scrub r12 register on kernel entry

In the Linux kernel, the following vulnerability has been resolved: s390/entry: Scrub r12 register on kernel entry Before commit f33f2d4c7c80 "s390/bp: remove TIFISOLATEBP", all entry handlers loaded r12 with the current task pointer lg %r12,LCCURRENT for use by the BPENTER/BPEXIT macros. That...