Use-after-free in Linux kernel - CVE-2026-68117

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Main Vulnerability Database Vulnerabilities #VU142211

Use-after-free in Linux kernel - CVE-2026-68117

Published: August 12, 2026


Vulnerability identifier: #VU142211
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68117
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in tipc_sk_create() and tipc_release() in the TIPC socket handling code when handling a failed accept() path after socket insertion failure. A local user can trigger creation of a large number of TIPC sockets and invoke accept() to cause a denial of service.

The issue is reached when the per-netns TIPC socket rhashtable hits its maximum size, leaving a pre-allocated child socket with a dangling sock->sk pointer during release.


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
kernel (Red Hat package)
kernel-rt (Red Hat package)

How to mitigate CVE-2026-68117

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - update to 4.18.0-553.162.1.el8_10
kernel-rt (Red Hat package) - update to 4.18.0-553.162.1.rt7.503.el8_10

External References

Related Security Bulletins