s390/entry: Scrub r12 register on kernel entry
Summary
| CVE | CVE-2026-31482 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-22 14:16:45 UTC |
| Updated | 2026-04-28 13:46:21 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.000180000 probability, percentile 0.048160000 (date 2026-04-26)
Problem Types: NVD-CWE-noinfo
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 a58d298a83a3a9b7ca99ded9d60a1e77231159ef git | Not specified |
| CNA | Linux | Linux | affected f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 95c899cd791803a5bf7b73e5994fbbe1cc1a9c36 git | Not specified |
| CNA | Linux | Linux | affected f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 7f4e3233faa8470dd0627bc49b2809f2bfebd909 git | Not specified |
| CNA | Linux | Linux | affected f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 99a8b420f3f0e162eb9c9c9253929d4d23f9bd30 git | Not specified |
| CNA | Linux | Linux | affected f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 0738d395aab8fae3b5a3ad3fc640630c91693c27 git | Not specified |
| CNA | Linux | Linux | affected 6.4 | Not specified |
| CNA | Linux | Linux | unaffected 6.4 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.131 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.80 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.21 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.11 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.