CVE-2026-52938

Kernel crash via BPF socket-storage unlink race

Published Jun 24, 2026 · Updated Jun 24, 2026

NULL pointer dereference in Linux Kernel 7.0 through 7.0.13 allows local users to crash the kernel via a BPF socket-storage race. bpf_selem_unlink_nofail clears the storage-map pointer before unlinking the element, allowing concurrent clone or diagnostic RCU readers to dereference a NULL smap. Reachability requires local low-privilege access and BPF socket storage; the bounded consequence is a kernel crash and service interruption.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel 7.0 through 7.0.13 allows local users to crash the kernel via a BPF socket-storage race. bpf_selem_unlink_nofail clears the storage-map pointer before unlinking the element, allowing concurrent clone or diagnostic RCU readers to dereference a NULL smap. Reachability requires local low-privilege access and BPF socket storage; the bounded consequence is a kernel crash and service interruption.

The record

CVE
CVE-2026-52938
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=5d800f87d0a5ea1b156c47a4b9fd128479335153 <375e4e33c18dfa05c5dfd5f3dfffeb29343dd4c7
  2. Affected versionversion=7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5d800f87d0a5ea1b156c47a4b9fd128479335153 <375e4e33c18dfa05c5dfd5f3dfffeb29343dd4c7; version=7.0

Published CVSS scores

5.5NIST NVDCVSS: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

CWE-476NULL Pointer Dereference
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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