CVE-2026-53035

Local service hang via recursive AF_UNIX socket locking

Published Jun 24, 2026 · Updated Jun 24, 2026

Improper locking in the Linux kernel 5.15 and later allows local users to hang affected systems through an AF_UNIX BPF iterator. When bpf_iter_unix_seq_show() takes lock_sock_fast()'s fast path, an iterator BPF program that updates a sockmap re-enters bh_lock_sock() on the same AF_UNIX socket lock and spins indefinitely. Triggering the hang requires local access and the ability to run the relevant BPF iterator program; the documented impact is availability loss without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel 5.15 and later allows local users to hang affected systems through an AF_UNIX BPF iterator. When bpf_iter_unix_seq_show() takes lock_sock_fast()'s fast path, an iterator BPF program that updates a sockmap re-enters bh_lock_sock() on the same AF_UNIX socket lock and spins indefinitely. Triggering the hang requires local access and the ability to run the relevant BPF iterator program; the documented impact is availability loss without data disclosure or modification.

The record

CVE
CVE-2026-53035
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499
Attack vector
local
Privileges
Unavailable

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=2c860a43dd77f969bb959336a2f743d7103a8f63 <3cef33b9813b78f227942572fb317afcd5c9ac94
  2. Affected versionversion=2c860a43dd77f969bb959336a2f743d7103a8f63 <4d328dd695383224aa750ddee6b4ad40c0f8d205
  3. Affected versionversion=2c860a43dd77f969bb959336a2f743d7103a8f63 <527057ebe8076dfbcaef51195ff1b7508646be2c
  4. Affected versionversion=2c860a43dd77f969bb959336a2f743d7103a8f63 <66d9fab4565eafe1afe7ba0581f79b76073b60fa
  5. Affected versionversion=2c860a43dd77f969bb959336a2f743d7103a8f63 <87828b380956d4986f59f2c086e0b09b3e6cdaae
  6. Affected versionversion=2c860a43dd77f969bb959336a2f743d7103a8f63 <bd3592129f24243713673a07225cf1f15a9bb835
  7. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2c860a43dd77f969bb959336a2f743d7103a8f63 <3cef33b9813b78f227942572fb317afcd5c9ac94; version=2c860a43dd77f969bb959336a2f743d7103a8f63 <4d328dd695383224aa750ddee6b4ad40c0f8d205; version=2c860a43dd77f969bb959336a2f743d7103a8f63 <527057ebe8076dfbcaef51195ff1b7508646be2c; version=2c860a43dd77f969bb959336a2f743d7103a8f63 <66d9fab4565eafe1afe7ba0581f79b76073b60fa; version=2c860a43dd77f969bb959336a2f743d7103a8f63 <87828b380956d4986f59f2c086e0b09b3e6cdaae; version=2c860a43dd77f969bb959336a2f743d7103a8f63 <bd3592129f24243713673a07225cf1f15a9bb835; version=5.15

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

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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