CVE-2026-31482

MEDIUM EPSS 2.3%
Published Apr 22, 20262mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥6.4.1  –  <6.6.131
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel6.4any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0738d395aab8fae3b5a3ad3fc640630c91693c27
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f4e3233faa8470dd0627bc49b2809f2bfebd909
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/95c899cd791803a5bf7b73e5994fbbe1cc1a9c36
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/99a8b420f3f0e162eb9c9c9253929d4d23f9bd30
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a58d298a83a3a9b7ca99ded9d60a1e77231159ef
    Patch