CVE-2026-52924Network attack vector

Remote kernel crash via stale SCTP scheduler pointer

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in the Linux Kernel SCTP state machine allows remote attackers to crash the kernel via a crafted Stale Cookie Error. During rollback from COOKIE_ECHOED to COOKIE_WAIT, sctp_stream_update() frees the old stream table but leaves stream->out_curr referencing a released sctp_stream_out entry used by later scheduler dequeues. A remote SCTP peer needs no host account but must reach the stale-cookie rollback after user data is queued; the demonstrated consequence is a kernel crash.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in the Linux Kernel SCTP state machine allows remote attackers to crash the kernel via a crafted Stale Cookie Error. During rollback from COOKIE_ECHOED to COOKIE_WAIT, sctp_stream_update() frees the old stream table but leaves stream->out_curr referencing a released sctp_stream_out entry used by later scheduler dequeues. A remote SCTP peer needs no host account but must reach the stale-cookie rollback after user data is queued; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2026-52924
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

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

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=4.15
  2. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <1d4652f677906a64487c13f9ace54b0eb263b5d0
  3. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <2afc9e684dc7fecf73db1edc937ebbc47b4b68dc
  4. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <3c0741a441a7df7099d7ca6a64a6a0de09c677c8
  5. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <83ade59e5da365f4bf8bce72c5a38774202b442f
  6. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <84b7a319105db2f917ccdcf502bdc866082b1285
  7. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <a6207349e703cfc04756a4d16dec9176135813a5
  8. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <e374b22e9b07b72a25909621464ff74096151bfb
  9. Affected versionversion=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <f46e1d1a758878f0d22c4fbbd1bf42bb7165d1e8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <1d4652f677906a64487c13f9ace54b0eb263b5d0; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <2afc9e684dc7fecf73db1edc937ebbc47b4b68dc; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <3c0741a441a7df7099d7ca6a64a6a0de09c677c8; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <83ade59e5da365f4bf8bce72c5a38774202b442f; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <84b7a319105db2f917ccdcf502bdc866082b1285; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <a6207349e703cfc04756a4d16dec9176135813a5; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <e374b22e9b07b72a25909621464ff74096151bfb; version=5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 <f46e1d1a758878f0d22c4fbbd1bf42bb7165d1e8

Published CVSS scores

9.8Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0UbuntuCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
CWE-416Use After Free
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo