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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.

PUBLISHED Reserved 2026-03-09 | Published 2026-04-22 | Updated 2026-04-22 | Assigner Linux

Product status

Default status
unaffected

f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 (git) before a58d298a83a3a9b7ca99ded9d60a1e77231159ef
affected

f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 (git) before 95c899cd791803a5bf7b73e5994fbbe1cc1a9c36
affected

f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 (git) before 7f4e3233faa8470dd0627bc49b2809f2bfebd909
affected

f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 (git) before 99a8b420f3f0e162eb9c9c9253929d4d23f9bd30
affected

f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 (git) before 0738d395aab8fae3b5a3ad3fc640630c91693c27
affected

Default status
affected

6.4
affected

Any version before 6.4
unaffected

6.6.131 (semver)
unaffected

6.12.80 (semver)
unaffected

6.18.21 (semver)
unaffected

6.19.11 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef

git.kernel.org/...c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36

git.kernel.org/...c/7f4e3233faa8470dd0627bc49b2809f2bfebd909

git.kernel.org/...c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30

git.kernel.org/...c/0738d395aab8fae3b5a3ad3fc640630c91693c27

cve.org (CVE-2026-31482)

nvd.nist.gov (CVE-2026-31482)

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