CVE-2026-31630

Local kernel memory corruption via undersized address buffers

Published Apr 24, 2026 · Updated Apr 24, 2026

Stack buffer overflow in the AF_RXRPC procfs helpers in Linux Kernel allows local users to corrupt kernel stack memory. The helpers in net/rxrpc/proc.c write a 51-byte NUL-terminated ISATAP IPv6 address with port into fixed 50-byte stack buffers. Exploitation requires local low-privileged access and a formatted AF_RXRPC endpoint; the overwrite can compromise kernel confidentiality, integrity, and availability.

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

Stack buffer overflow in the AF_RXRPC procfs helpers in Linux Kernel allows local users to corrupt kernel stack memory. The helpers in net/rxrpc/proc.c write a 51-byte NUL-terminated ISATAP IPv6 address with port into fixed 50-byte stack buffers. Exploitation requires local low-privileged access and a formatted AF_RXRPC endpoint; the overwrite can compromise kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-31630
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=4.9
  2. Affected versionversion=75b54cb57ca34cbe7a87c6ac757c55360a624590 <10ebed83f9f6414af4e85bc85ffaeda7effdd874
  3. Affected versionversion=75b54cb57ca34cbe7a87c6ac757c55360a624590 <a44ce6aa2efb61fe44f2cfab72bb01544bbca272
  4. Affected versionversion=75b54cb57ca34cbe7a87c6ac757c55360a624590 <db297c78ce537c9ac96f0eda9b25ad72c8caefa9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.9; version=75b54cb57ca34cbe7a87c6ac757c55360a624590 <10ebed83f9f6414af4e85bc85ffaeda7effdd874; version=75b54cb57ca34cbe7a87c6ac757c55360a624590 <a44ce6aa2efb61fe44f2cfab72bb01544bbca272; version=75b54cb57ca34cbe7a87c6ac757c55360a624590 <db297c78ce537c9ac96f0eda9b25ad72c8caefa9

Published CVSS scores

7.8LinuxCVSS: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.

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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

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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