CVE-2026-31482None▾ SunlitIn 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 point…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 < a58d298a83a3a9b7ca99ded9d60a1e77231159efLinux >= f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 < 95c899cd791803a5bf7b73e5994fbbe1cc1a9c36Linux >= f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 < 7f4e3233faa8470dd0627bc49b2809f2bfebd909Linux >= f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 < 99a8b420f3f0e162eb9c9c9253929d4d23f9bd30Linux >= f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 < 0738d395aab8fae3b5a3ad3fc640630c91693c27Linux 6.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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