CVE-2024-27402

Kernel memory corruption via unlocked PEP queue peek

Published May 17, 2024 · Updated May 11, 2026

Race condition in Linux kernel Phonet PEP before 6.8 allows local users to access a dequeued socket buffer through an ioctl. The SIOCINQ path checked queue emptiness under the socket lock, then called skb_peek although each receive queue has a separate spin lock. A local user must win that queue-removal race; the result is a NULL or stale buffer pointer that can disclose or corrupt kernel memory or interrupt the system.

CVSS severity5.8
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel Phonet PEP before 6.8 allows local users to access a dequeued socket buffer through an ioctl. The SIOCINQ path checked queue emptiness under the socket lock, then called skb_peek although each receive queue has a separate spin lock. A local user must win that queue-removal race; the result is a NULL or stale buffer pointer that can disclose or corrupt kernel memory or interrupt the system.

The record

CVE
CVE-2024-27402
Published
May 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 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=2.6.28
  2. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <0a9f558c72c47472c38c05fcb72c70abb9104277
  3. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <7d2a894d7f487dcb894df023e9d3014cf5b93fe5
  4. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <7d3914a477eed92b48c493a8631cc4554ab4fd4f
  5. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <8ef4fcc7014b9f93619851d6b78d6cc2789a4c88
  6. Affected versionversion=9641458d3ec42def729fde64669abf07f3220cd5 <9d5523e065b568e79dfaa2ea1085a5bcf74baf78

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=9641458d3ec42def729fde64669abf07f3220cd5 <0a9f558c72c47472c38c05fcb72c70abb9104277; version=9641458d3ec42def729fde64669abf07f3220cd5 <7d2a894d7f487dcb894df023e9d3014cf5b93fe5; version=9641458d3ec42def729fde64669abf07f3220cd5 <7d3914a477eed92b48c493a8631cc4554ab4fd4f; version=9641458d3ec42def729fde64669abf07f3220cd5 <8ef4fcc7014b9f93619851d6b78d6cc2789a4c88; version=9641458d3ec42def729fde64669abf07f3220cd5 <9d5523e065b568e79dfaa2ea1085a5bcf74baf78

Published CVSS scores

5.8CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/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

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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