CVE-2026-31483

MEDIUM

s390/syscalls: Add spectre boundary for syscall dispatch table

Title source: cna

Description

In the Linux kernel, the following vulnerability has been resolved: s390/syscalls: Add spectre boundary for syscall dispatch table The s390 syscall number is directly controlled by userspace, but does not have an array_index_nospec() boundary to prevent access past the syscall function pointer tables.

References (7)

Core 7

Core References

https://git.kernel.org/stable/c/3c3b97064764899c39a0abbd35a6caa031e70333

https://git.kernel.org/stable/c/1cb9c7bc9025c637564fabc7fcc3c9343949e310

https://git.kernel.org/stable/c/7a5260fbc6e79a1595328ec5c6aa3f937504a1f0

https://git.kernel.org/stable/c/f8c444b918d639e1f9a621ee20fe481c1d10dfc4

https://git.kernel.org/stable/c/87776f02449e3bded95b2ccbd6b012e9ae64e6f3

https://git.kernel.org/stable/c/4d05dd18d867d58c6952a3bc260d244899da7256

https://git.kernel.org/stable/c/48b8814e25d073dd84daf990a879a820bad2bcbd

Scores

CVSS v3 5.5

EPSS 0.0001

EPSS Percentile 3.4%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

Status published

Products (19)

Linux/Linux < 5.12

Linux/Linux 5.12

Linux/Linux 5.15.203 - 5.15.*

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - 1cb9c7bc9025c637564fabc7fcc3c9343949e310

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - 3c3b97064764899c39a0abbd35a6caa031e70333

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - 48b8814e25d073dd84daf990a879a820bad2bcbd

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - 4d05dd18d867d58c6952a3bc260d244899da7256

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - 7a5260fbc6e79a1595328ec5c6aa3f937504a1f0

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - 87776f02449e3bded95b2ccbd6b012e9ae64e6f3

Linux/Linux 56e62a73702836017564eaacd5212e4d0fa1c01d - f8c444b918d639e1f9a621ee20fe481c1d10dfc4

... and 9 more

Published Apr 22, 2026

Tracked Since Apr 22, 2026