CVE-2026-93147

Unspecified local impact via stale register bits

Published Sep 17, 2026 · Updated Sep 18, 2026

Improper register initialization in Linux 7.2 on s390 allows local users to cause unspecified impact through BPF JIT execution. In arch/s390/net/bpf_jit_comp.c, the JIT uses ly to load the 32-bit cpu_nr value into 64-bit BPF_REG_0 without clearing the register's upper bits. Reachability requires an s390 system using the affected BPF JIT path; the Linux CVE team has not published the resulting failure mode.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper register initialization in Linux 7.2 on s390 allows local users to cause unspecified impact through BPF JIT execution. In arch/s390/net/bpf_jit_comp.c, the JIT uses ly to load the 32-bit cpu_nr value into 64-bit BPF_REG_0 without clearing the register's upper bits. Reachability requires an s390 system using the affected BPF JIT path; the Linux CVE team has not published the resulting failure mode.

The record

CVE
CVE-2026-93147
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.2
  2. Affected versionversion=9012cf2491e3c5d28d098b0d6da804af82977032 <5f6cc299938b561cb01e343bab7042611fcee12a
  3. Affected versionversion=9012cf2491e3c5d28d098b0d6da804af82977032 <88500a86ab79f01c568de6ed00f5b1c5c79f11d5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.2; version=9012cf2491e3c5d28d098b0d6da804af82977032 <5f6cc299938b561cb01e343bab7042611fcee12a; version=9012cf2491e3c5d28d098b0d6da804af82977032 <88500a86ab79f01c568de6ed00f5b1c5c79f11d5

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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