CVE-2026-31482 (GCVE-0-2026-31482)
Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-05-11 22:09
VLAI
EPSS
VEX
Title
s390/entry: Scrub r12 register on kernel entry
Summary
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.
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 , < a58d298a83a3a9b7ca99ded9d60a1e77231159ef
(git)
Affected: f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 , < 95c899cd791803a5bf7b73e5994fbbe1cc1a9c36 (git) Affected: f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 , < 7f4e3233faa8470dd0627bc49b2809f2bfebd909 (git) Affected: f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 , < 99a8b420f3f0e162eb9c9c9253929d4d23f9bd30 (git) Affected: f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 , < 0738d395aab8fae3b5a3ad3fc640630c91693c27 (git) |
guessed | |
| Linux | Linux |
Affected:
6.4
Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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