CVE-2026-31482 Details
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.
A vulnerability in the Linux kernel's handling of the r12 register during kernel entry has been addressed. In the s390 architecture, all entry handlers previously loaded the r12 register with the current task pointer for use by certain macros. However, a recent commit removed this functionality without properly clearing the register, leading to potential inconsistencies. The vulnerability affects the Linux kernel stable tree.
The vulnerability has been fixed in the Linux kernel stable tree. Users can upgrade to the latest version to address this issue.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27 | kernel.org | Patch |
| https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909 | kernel.org | Patch |
| https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36 | kernel.org | Patch |
| https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.4.1, < 6.6.131 >= 6.7, < 6.12.80 >= 6.13, < 6.18.21 >= 6.19, < 6.19.11 6.4 - 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 7.0 rc7 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Apr 28, 2026 | Initial Analysis | [email protected] |
| Apr 22, 2026 | New CVE Received | kernel.org |