CVE-2023-52735

System crash via recursive sockmap callbacks

Published May 21, 2024 · Updated May 23, 2026

Stack overflow in affected Linux kernel versions allows local users with high privileges to crash the system during BPF sockmap teardown. The sock_map close, destroy, and unhash protocol callbacks can invoke themselves recursively instead of dispatching to the saved underlying socket callbacks, exhausting the kernel stack. Exploitation requires a crafted BPF sockmap socket state and high local privileges; the bounded consequence is a host crash rather than data modification.

CVSS severity5.6
Medium
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in affected Linux kernel versions allows local users with high privileges to crash the system during BPF sockmap teardown. The sock_map close, destroy, and unhash protocol callbacks can invoke themselves recursively instead of dispatching to the saved underlying socket callbacks, exhausting the kernel stack. Exploitation requires a crafted BPF sockmap socket state and high local privileges; the bounded consequence is a host crash rather than data modification.

The record

CVE
CVE-2023-52735
Published
May 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=0580e47c8895a4d61ee095f086cba1ded7ca5e7f
  2. Affected versionversion=5.14.19 <5.15
  3. Affected versionversion=5.15.3 <5.15.95
  4. Affected versionversion=5.16
  5. Affected versionversion=c5cc0d23c5414d23438c5024890e367cc5a0e645 <f312367f5246e04df564d341044286e9e37a97ba
  6. Affected versionversion=c5d2177a72a1659554922728fc407f59950aa929 <5b4a79ba65a1ab479903fff2e604865d229b70a9
  7. Affected versionversion=c5d2177a72a1659554922728fc407f59950aa929 <7499859881488da97589f3c79cc66fa75748ad49

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=0580e47c8895a4d61ee095f086cba1ded7ca5e7f; version=5.14.19 <5.15; version=5.15.3 <5.15.95; version=5.16; version=c5cc0d23c5414d23438c5024890e367cc5a0e645 <f312367f5246e04df564d341044286e9e37a97ba; version=c5d2177a72a1659554922728fc407f59950aa929 <5b4a79ba65a1ab479903fff2e604865d229b70a9; version=c5d2177a72a1659554922728fc407f59950aa929 <7499859881488da97589f3c79cc66fa75748ad49
The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f4

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
5.6Canonical UbuntuCVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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