Use of Uninitialized Variable in Linux kernel - CVE-2026-98402

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Main Vulnerability Database Vulnerabilities #VU155916

Use of Uninitialized Variable in Linux kernel - CVE-2026-98402

Published: October 15, 2026


Vulnerability identifier: #VU155916
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98402
CWE-ID: CWE-457
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to trigger a kernel warning.

The vulnerability exists due to use of an uninitialized transport header offset in the icmp_send tracepoint when recording ICMP send events. A local user can trigger ICMP error handling for a packet whose transport header has not been initialized to trigger a kernel warning.

The reported warning occurs with CONFIG_DEBUG_NET=y. Relevant processing paths include link failures, ARP errors, forwarding, and AF_PACKET.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-98402

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

External References

Related Security Bulletins