Answer in brief
CVE-2026-31482 records a Unknown severity vulnerability in s390/entry: Scrub r12 register on kernel entry. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 <a58d298a83a3a9b7ca99ded9d60a1e77231159ef || >=f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 <95c899cd791803a5bf7b73e5994fbbe1cc1a9c36 || >=f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 <7f4e3233faa8470dd0627bc49b2809f2bfebd909 || >=f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 <99a8b420f3f0e162eb9c9c9253929d4d23f9bd30 || >=f33f2d4c7c80c641f6ca3dfe5e7dfe1f91543780 <0738d395aab8fae3b5a3ad3fc640630c91693c27 | a58d298a83a3a9b7ca99ded9d60a1e77231159ef, 95c899cd791803a5bf7b73e5994fbbe1cc1a9c36, 7f4e3233faa8470dd0627bc49b2809f2bfebd909, 99a8b420f3f0e162eb9c9c9253929d4d23f9bd30, 0738d395aab8fae3b5a3ad3fc640630c91693c27 |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.