CVE-2026-31483

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.

CVSS v3.1 Score

5.5

MEDIUM

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

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.12.1 — 5.15.203
linux	linux_kernel	5.16 — 6.1.168
linux	linux_kernel	6.2 — 6.6.131
linux	linux_kernel	6.7 — 6.12.80
linux	linux_kernel	6.13 — 6.18.21
linux	linux_kernel	6.19 — 6.19.11
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/1cb9c7bc9025c637564fabc7fcc3c9343949e310 https://git.kernel.org/stable/c/3c3b97064764899c39a0abbd35a6caa031e70333 https://git.kernel.org/stable/c/48b8814e25d073dd84daf990a879a820bad2bcbd https://git.kernel.org/stable/c/4d05dd18d867d58c6952a3bc260d244899da7256 https://git.kernel.org/stable/c/7a5260fbc6e79a1595328ec5c6aa3f937504a1f0 https://git.kernel.org/stable/c/87776f02449e3bded95b2ccbd6b012e9ae64e6f3 https://git.kernel.org/stable/c/f8c444b918d639e1f9a621ee20fe481c1d10dfc4

Frequently Asked Questions

What is CVE-2026-31483? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31483? +

CVE-2026-31483 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-31483? +

CVE-2026-31483 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-31483? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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