CVE-2023-51780

Local system crash via unlocked receive queue

Published Dec 25, 2023 · Updated Aug 2, 2024

Use-after-free in the Linux kernel before 6.6.8 allows local users to crash the system through an ATM socket ioctl race. do_vcc_ioctl reads an skb from sk_receive_queue without holding the queue lock, while concurrent vcc_recvmsg processing can free that skb. The path requires local low-privileged access to a connected ATM socket and winning the race; successful triggering can crash the kernel.

CVSS severity7.0
High
EPSS probability0.51%
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 before 6.6.8 allows local users to crash the system through an ATM socket ioctl race. do_vcc_ioctl reads an skb from sk_receive_queue without holding the queue lock, while concurrent vcc_recvmsg processing can free that skb. The path requires local low-privileged access to a connected ATM socket and winning the race; successful triggering can crash the kernel.

The record

CVE
CVE-2023-51780
Published
Dec 25, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/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

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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