CVE-2026-31483

MEDIUMNVD 5.55.5—

5.5

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: 5.5
EG Score: 5.5(high)
EPSS: 3.4%
KEV: Not listed

Published

April 22, 2026

Last Modified

April 28, 2026

References (7)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cb9c7bc9025c637564fabc7fcc3c9343949e310
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c3b97064764899c39a0abbd35a6caa031e70333
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48b8814e25d073dd84daf990a879a820bad2bcbd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d05dd18d867d58c6952a3bc260d244899da7256
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a5260fbc6e79a1595328ec5c6aa3f937504a1f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87776f02449e3bded95b2ccbd6b012e9ae64e6f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8c444b918d639e1f9a621ee20fe481c1d10dfc4

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2026-314832026-04-23
s390/syscalls: Add spectre boundary for syscall dispatch table

Data Freshness Timeline

(refreshed 17× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
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2026-05-22 21:16 UTCepss_batch

Frequently asked(5)

What is CVE-2026-31483?

CVE-2026-31483 is a medium vulnerability published on April 22, 2026. 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 arrayindexnospec() boundary to prevent access past the syscall function pointer tables.

When was CVE-2026-31483 disclosed?

CVE-2026-31483 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on April 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-31483 actively exploited?

CVE-2026-31483 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-31483?

CVE-2026-31483 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2026-31483?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31483, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-31483

📅 Published

🔄 Last Modified

🔗 References (7)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

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References (7)

Frequently asked(5)

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