CVE-2026-31419

System crash via racy bonding slave selection

Published Apr 13, 2026 · Updated Apr 13, 2026

Use-after-free in the Linux Kernel bonding driver allows local users to crash the system through concurrent slave-list changes. During bond_xmit_broadcast(), RCU-protected iteration can observe enslave or release mutations, causing the original skb to be selected as last more than once and double-consumed. Reaching the race requires local privileges to modify bond membership while broadcast-mode traffic is transmitted; the demonstrated consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel bonding driver allows local users to crash the system through concurrent slave-list changes. During bond_xmit_broadcast(), RCU-protected iteration can observe enslave or release mutations, causing the original skb to be selected as last more than once and double-consumed. Reaching the race requires local privileges to modify bond membership while broadcast-mode traffic is transmitted; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2026-31419
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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=20949c3816463e97c6f8fe84c0280c7e5ae83a8d
  2. Affected versionversion=4e5bd03ae34652cd932ab4c91c71c511793df75c <2884bf72fb8f03409e423397319205de48adca16
  3. Affected versionversion=4e5bd03ae34652cd932ab4c91c71c511793df75c <d4cc7e4c80b1634c7b1497574a2fdb18df6c026c
  4. Affected versionversion=4e5bd03ae34652cd932ab4c91c71c511793df75c <f5b94654a4a19891a8108d66ef166de6c028c6cd
  5. Affected versionversion=5.17
  6. Affected versionversion=c1f1691ef84fa6d38fa5e5148eca073145e97ffa
  7. Affected versionversion=f1d206181f19b00b275b258fea1418718a2f4173

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=20949c3816463e97c6f8fe84c0280c7e5ae83a8d; version=4e5bd03ae34652cd932ab4c91c71c511793df75c <2884bf72fb8f03409e423397319205de48adca16; version=4e5bd03ae34652cd932ab4c91c71c511793df75c <d4cc7e4c80b1634c7b1497574a2fdb18df6c026c; version=4e5bd03ae34652cd932ab4c91c71c511793df75c <f5b94654a4a19891a8108d66ef166de6c028c6cd; version=5.17; version=c1f1691ef84fa6d38fa5e5148eca073145e97ffa; version=f1d206181f19b00b275b258fea1418718a2f4173

Published CVSS scores

7.0redhat-SADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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-416Use After Free
T1499.004Application or System Exploitation

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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