CVE-2023-52701

Local kernel crash via unwhitelisted mark copy

Published May 21, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel allows local users to crash arm64 systems through a marked-socket receive operation. sock_recv_mark passes skb->mark directly from the skbuff_head_cache allocation to copy_to_user, outside the cache's whitelisted skb->cb region, so hardened usercopy aborts. The crash requires an arm64 kernel built with CONFIG_HARDENED_USERCOPY and low-privileged local access to invoke recvmsg; no data modification is reported.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel allows local users to crash arm64 systems through a marked-socket receive operation. sock_recv_mark passes skb->mark directly from the skbuff_head_cache allocation to copy_to_user, outside the cache's whitelisted skb->cb region, so hardened usercopy aborts. The crash requires an arm64 kernel built with CONFIG_HARDENED_USERCOPY and low-privileged local access to invoke recvmsg; no data modification is reported.

The record

CVE
CVE-2023-52701
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.19
  2. Affected versionversion=6fd1d51cfa253b5ee7dae18d7cf1df830e9b6137 <2558b8039d059342197610498c8749ad294adee5
  3. Affected versionversion=6fd1d51cfa253b5ee7dae18d7cf1df830e9b6137 <863a7de987f02a901bf215509276a7de0370e0f9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=6fd1d51cfa253b5ee7dae18d7cf1df830e9b6137 <2558b8039d059342197610498c8749ad294adee5; version=6fd1d51cfa253b5ee7dae18d7cf1df830e9b6137 <863a7de987f02a901bf215509276a7de0370e0f9

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

T1499Endpoint Denial of Service

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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