CVE-2026-31525

Kernel memory corruption via BPF interpreter mismatch

Published Apr 22, 2026 · Updated Apr 22, 2026

Out-of-bounds map access in affected Linux Kernel releases allows local users to corrupt kernel memory through crafted BPF programs. The BPF interpreter applies abs() to S32_MIN in its signed 32-bit division and modulo handlers, leaves the minimum unchanged, sign-extends it, and makes do_div() disagree with verifier range tracking. Exploitation requires a local account able to load a program that reaches the interpreter; the mismatch enables out-of-bounds access to BPF map values.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds map access in affected Linux Kernel releases allows local users to corrupt kernel memory through crafted BPF programs. The BPF interpreter applies abs() to S32_MIN in its signed 32-bit division and modulo handlers, leaves the minimum unchanged, sign-extends it, and makes do_div() disagree with verifier range tracking. Exploitation requires a local account able to load a program that reaches the interpreter; the mismatch enables out-of-bounds access to BPF map values.

The record

CVE
CVE-2026-31525
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.6
  2. Affected versionversion=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <0d5d8c3ce45c734aaf3c51cbef59155a6746157d
  3. Affected versionversion=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <694ea55f1b1c74f9942d91ec366ae9e822422e42
  4. Affected versionversion=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <9ab1227765c446942f290c83382f0b19887c55cf
  5. Affected versionversion=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <c77b30bd1dcb61f66c640ff7d2757816210c7cb0
  6. Affected versionversion=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <f14ca604c0ff274fba19f73f1f0485c0047c1396

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.6; version=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <0d5d8c3ce45c734aaf3c51cbef59155a6746157d; version=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <694ea55f1b1c74f9942d91ec366ae9e822422e42; version=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <9ab1227765c446942f290c83382f0b19887c55cf; version=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <c77b30bd1dcb61f66c640ff7d2757816210c7cb0; version=ec0e2da95f72d4a46050a4d994e4fe471474fd80 <f14ca604c0ff274fba19f73f1f0485c0047c1396

Published CVSS scores

7.8kernel.orgCVSS: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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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