CVE-2026-74609

Kernel memory corruption via unlocked TIPC link pointer

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in Linux kernel TIPC allows local users with CAP_NET_ADMIN to corrupt kernel memory during concurrent bearer teardown. tipc_node_link_down() reads le->link before taking the node lock, allowing a concurrent delete path to free the object before tipc_link_is_establishing() reads it or tipc_link_reset() writes through it. Triggering the race requires local CAP_NET_ADMIN access to disable a TIPC bearer or tear down a network namespace; successful exploitation can disclose kernel memory, corrupt the kernel heap, or panic the system.

CVSS severity7.8
High
EPSS probability0.13%
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 Linux kernel TIPC allows local users with CAP_NET_ADMIN to corrupt kernel memory during concurrent bearer teardown. tipc_node_link_down() reads le->link before taking the node lock, allowing a concurrent delete path to free the object before tipc_link_is_establishing() reads it or tipc_link_reset() writes through it. Triggering the race requires local CAP_NET_ADMIN access to disable a TIPC bearer or tear down a network namespace; successful exploitation can disclose kernel memory, corrupt the kernel heap, or panic the system.

The record

CVE
CVE-2026-74609
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=4.4
  2. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <2be741ad565c610871a6a95062c12c39da7168fd
  3. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <47ba70891b10b2feb52462086b7fcd2ad75d3ce3
  4. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <5558a8312452ddb21eff22b1cbd84302ad951944
  5. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <69d209461c110388710e483a130caf051e4fd09a
  6. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <a714d62513befef37f71f4ae89bb1fe173b65f2e
  7. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <c3f2347a47754eac690967cfd82cb6d559817b07
  8. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <cba9ccb47e9fa4cc77692fb896cc5ab57a667882
  9. Affected versionversion=73f646cec35477b5099d7e952297cb9e1855be45 <de017c22135f545ca4e65d1eada22887b64958eb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=73f646cec35477b5099d7e952297cb9e1855be45 <2be741ad565c610871a6a95062c12c39da7168fd; version=73f646cec35477b5099d7e952297cb9e1855be45 <47ba70891b10b2feb52462086b7fcd2ad75d3ce3; version=73f646cec35477b5099d7e952297cb9e1855be45 <5558a8312452ddb21eff22b1cbd84302ad951944; version=73f646cec35477b5099d7e952297cb9e1855be45 <69d209461c110388710e483a130caf051e4fd09a; version=73f646cec35477b5099d7e952297cb9e1855be45 <a714d62513befef37f71f4ae89bb1fe173b65f2e; version=73f646cec35477b5099d7e952297cb9e1855be45 <c3f2347a47754eac690967cfd82cb6d559817b07; version=73f646cec35477b5099d7e952297cb9e1855be45 <cba9ccb47e9fa4cc77692fb896cc5ab57a667882; version=73f646cec35477b5099d7e952297cb9e1855be45 <de017c22135f545ca4e65d1eada22887b64958eb

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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