CVE-2026-31483: s390/syscalls: Add spectre boundary for syscall dispatch table
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 1cb9c7bc9025c637564fabc7fcc3c9343949e310, 3c3b97064764899c39a0abbd35a6caa031e70333, 48b8814e25d073dd84daf990a879a820bad2bcbd; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.134.1-2; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.
Low priority for now. Upgrade to Linux Linux 1cb9c7bc9025c637564fabc7fcc3c9343949e310, 3c3b97064764899c39a0abbd35a6caa031e70333, 48b8814e25d073dd84daf990a879a820bad2bcbd; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.134.1-2; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Apr 22, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.1% · 2th percentile
- CWE
- —
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.12.1 and later · before 5.15.203
- linux linux kernel5.16 and later · before 6.1.168
- linux linux kernel6.2 and later · before 6.6.131
- linux linux kernel6.7 and later · before 6.12.80
- linux linux kernel6.13 and later · before 6.18.21
- linux linux kernel6.19 and later · before 6.19.11
- linux linux kernel5.12
- linux linux kernel7.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 5.12affected
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before 3c3b97064764899c39a0abbd35a6caa031e70333affected · git
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before 1cb9c7bc9025c637564fabc7fcc3c9343949e310affected · git
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before 7a5260fbc6e79a1595328ec5c6aa3f937504a1f0affected · git
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before f8c444b918d639e1f9a621ee20fe481c1d10dfc4affected · git
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before 87776f02449e3bded95b2ccbd6b012e9ae64e6f3affected · git
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before 4d05dd18d867d58c6952a3bc260d244899da7256affected · git
- 56e62a73702836017564eaacd5212e4d0fa1c01d and later · before 48b8814e25d073dd84daf990a879a820bad2bcbdaffected · git
- before 5.12not affected · semver
- 5.15.203 and later · up to and including 5.15.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.170-1 | 6.1.170-1 |
| Debian:13 | linux | before 6.12.85-1 | 6.12.85-1 |
| Debian:14 | linux | before 6.19.11-1 | 6.19.11-1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.328.1 | 4.12.14-122.328.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_87 | before 1-8.5.1 | 1-8.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.130.1 | 6.4.0-150600.23.130.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_30 | before 1-150600.13.5.1 | 1-150600.13.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_20 | before 1-150700.15.3.2 | 1-150700.15.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_19 | before 1-150700.1.5.1 | 1-150700.1.5.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-64kb | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-default | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-default-base | before 6.4.0-150700.53.78.1.150700.17.43.2 | 6.4.0-150700.53.78.1.150700.17.43.2 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-source | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-zfcpdump | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | kernel-docs | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | kernel-obs-build | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Development Tools 15 SP7 | kernel-syms | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Module for Public Cloud 15 SP7 | kernel-azure | before 6.4.0-150700.53.78.1 | 6.4.0-150700.53.78.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-source | before 4.12.14-122.328.1 | 4.12.14-122.328.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-syms | before 4.12.14-122.328.1 | 4.12.14-122.328.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-64kb | before 6.4.0-150600.23.130.1 | 6.4.0-150600.23.130.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-default-base | before 6.4.0-150600.23.130.1.150600.12.60.3 | 6.4.0-150600.23.130.1.150600.12.60.3 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-docs | before 6.4.0-150600.23.130.1 | 6.4.0-150600.23.130.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | kernel-obs-build | before 6.4.0-150600.23.130.1 | 6.4.0-150600.23.130.1 |
+18
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-31481Apr 22, 2026 · tracing: Drain deferred trigger frees if kthread creation fails22Monitor
- ← EarlierCVE-2026-31482Apr 22, 2026 · s390/entry: Scrub r12 register on kernel entry22Monitor
- Later →CVE-2026-31484Apr 22, 2026 · io_uring/fdinfo: fix OOB read in SQE_MIXED wrap check28Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 1cb9c7bc9025c637564fabc7fcc3c9343949e310 | Vendor (CNA) |
| Linux Linux | 3c3b97064764899c39a0abbd35a6caa031e70333 | Vendor (CNA) |
| Linux Linux | 48b8814e25d073dd84daf990a879a820bad2bcbd | Vendor (CNA) |
| Linux Linux | 4d05dd18d867d58c6952a3bc260d244899da7256 | Vendor (CNA) |
| Linux Linux | 7a5260fbc6e79a1595328ec5c6aa3f937504a1f0 | Vendor (CNA) |
| Linux Linux | 87776f02449e3bded95b2ccbd6b012e9ae64e6f3 | Vendor (CNA) |
| Linux Linux | f8c444b918d639e1f9a621ee20fe481c1d10dfc4 | Vendor (CNA) |
| azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 | 6.6.134.1-2 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 | Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-azure | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-default | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default-base | 6.12.0-160000.34.1.160000.2.15 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-docs | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-kvmsmall | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-obs-build | 6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-obs-qa | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-rt | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-source | 6.12.0-160000.34.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-syms | 6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/3c3b97064764899c39a0abbd35a6caa031e70333
- git.kernel.org/stable/c/48b8814e25d073dd84daf990a879a820bad2bcbd
- git.kernel.org/stable/c/4d05dd18d867d58c6952a3bc260d244899da7256
- git.kernel.org/stable/c/7a5260fbc6e79a1595328ec5c6aa3f937504a1f0
- git.kernel.org/stable/c/87776f02449e3bded95b2ccbd6b012e9ae64e6f3
- git.kernel.org/stable/c/f8c444b918d639e1f9a621ee20fe481c1d10dfc4
Vendor advisories and official records. Exploit/PoC links are deliberately left out.