CVE-2026-52910Public exploit

Local kernel compromise via reuseport cBPF use-after-free

Published Jun 19, 2026 · Updated Jun 19, 2026

Use-after-free in Linux Kernel stable branches allows local users to compromise or crash the kernel through UDP reuseport cBPF replacement. sk_reuseport_prog_free() immediately frees a detached or replaced classic BPF program without waiting for RCU readers in reuseport_select_sock() to finish using it. An unprivileged local user can create the sockets, swap the filter, and send concurrent packets; the demonstrated public proof of concept causes a kernel panic.

CVSS severity7.8
High
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

Use-after-free in Linux Kernel stable branches allows local users to compromise or crash the kernel through UDP reuseport cBPF replacement. sk_reuseport_prog_free() immediately frees a detached or replaced classic BPF program without waiting for RCU readers in reuseport_select_sock() to finish using it. An unprivileged local user can create the sockets, swap the filter, and send concurrent packets; the demonstrated public proof of concept causes a kernel panic.

The record

CVE
CVE-2026-52910
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-364, CWE-125, T1068, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.5
  2. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <08264d5bba0bdd3a79bc2984fee09286aba0c4eb
  3. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <18fc650ccd7fe3376eca89203668cfb8268f60df
  4. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <298db6167f81e9c470a57cf652e4e47757b4293e
  5. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <87dfb977bdb6eaa47e9993a34e18f44970f88b1f
  6. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <90e47dc5c572d1c73971ac51c7428803f42b78eb
  7. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <c3e3fddda6b5d9ba505d218b4055e7d8a282ac57
  8. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <f8b8f1d4bb76098e87b8269a0631019648330e6d
  9. Affected versionversion=538950a1b7527a0a52ccd9337e3fcd304f027f13 <fec41484e7c2aa7ded44c541bba98872be937754

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.5; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <08264d5bba0bdd3a79bc2984fee09286aba0c4eb; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <18fc650ccd7fe3376eca89203668cfb8268f60df; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <298db6167f81e9c470a57cf652e4e47757b4293e; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <87dfb977bdb6eaa47e9993a34e18f44970f88b1f; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <90e47dc5c572d1c73971ac51c7428803f42b78eb; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <c3e3fddda6b5d9ba505d218b4055e7d8a282ac57; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <f8b8f1d4bb76098e87b8269a0631019648330e6d; version=538950a1b7527a0a52ccd9337e3fcd304f027f13 <fec41484e7c2aa7ded44c541bba98872be937754

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4Red HatCVSS:3.1/AV:L/AC:H/PR:H/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 exploitPublished

Weakness, pattern, technique

CWE-364Signal Handler Race Condition
CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation
T1499Endpoint Denial of Service

Public exploit references

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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