CVE-2024-26636

Kernel crash via stale LLC send checks

Published Mar 18, 2024 · Updated May 11, 2026

Improper locking in the Linux kernel allows local users to crash the system by racing LLC message sends against bonding changes. llc_ui_sendmsg releases its socket lock while allocating an skb, then reacquires the lock without repeating device checks or reserving Ethernet-header headroom. Exploitation requires local low-privileged access and a changing bonded device; the demonstrated outcome is an skb underflow panic and kernel crash.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel allows local users to crash the system by racing LLC message sends against bonding changes. llc_ui_sendmsg releases its socket lock while allocating an skb, then reacquires the lock without repeating device checks or reserving Ethernet-header headroom. Exploitation requires local low-privileged access and a changing bonded device; the demonstrated outcome is an skb underflow panic and kernel crash.

The record

CVE
CVE-2024-26636
Published
Mar 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <04f2a74b562f3a7498be0399309669f342793d8c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d53b813ff8b177f86f149c2f744442681f720e4
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84e9d10419f6f4f3f3cd8f9aaf44a48719aa4b1b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b643d0defcbacd7fe548bc65c3e4e6f17dc5eb2d
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c22044270da68881074fda81a7d34812726cb249
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c451c008f563d56d5e676c9dcafae565fcad84bb
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cafd3ad3fe03ef4d6632747be9ee15dc0029db4b
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dad555c816a50c6a6a8a86be1f9177673918c647
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <04f2a74b562f3a7498be0399309669f342793d8c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d53b813ff8b177f86f149c2f744442681f720e4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84e9d10419f6f4f3f3cd8f9aaf44a48719aa4b1b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b643d0defcbacd7fe548bc65c3e4e6f17dc5eb2d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c22044270da68881074fda81a7d34812726cb249; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c451c008f563d56d5e676c9dcafae565fcad84bb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cafd3ad3fe03ef4d6632747be9ee15dc0029db4b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dad555c816a50c6a6a8a86be1f9177673918c647; version=2.6.12

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

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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