Linux Kernel s390 Spectre: Unbounded Syscall Dispatch Table Access
CVE-2026-31483 Published on April 22, 2026
s390/syscalls: Add spectre boundary for syscall dispatch table
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.
Products Associated with CVE-2026-31483
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Affected Versions
Linux:- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below 3c3b97064764899c39a0abbd35a6caa031e70333 is affected.
- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below 1cb9c7bc9025c637564fabc7fcc3c9343949e310 is affected.
- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below 7a5260fbc6e79a1595328ec5c6aa3f937504a1f0 is affected.
- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below f8c444b918d639e1f9a621ee20fe481c1d10dfc4 is affected.
- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below 87776f02449e3bded95b2ccbd6b012e9ae64e6f3 is affected.
- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below 4d05dd18d867d58c6952a3bc260d244899da7256 is affected.
- Version 56e62a73702836017564eaacd5212e4d0fa1c01d and below 48b8814e25d073dd84daf990a879a820bad2bcbd is affected.
- Version 5.12 is affected.
- Before 5.12 is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.168, <= 6.1.* is unaffected.
- Version 6.6.131, <= 6.6.* is unaffected.
- Version 6.12.80, <= 6.12.* is unaffected.
- Version 6.18.21, <= 6.18.* is unaffected.
- Version 6.19.11, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.