PT-2026-6165 · Linux+2 · Linux Kernel+2
Syzbot
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Published
2026-01-01
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Updated
2026-05-26
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CVE-2026-23095
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel’s GUE (Generic UDP Encapsulation) protocol handler contains a memory leak when processing packets with an inner IP protocol of 0. The issue occurs because
gue udp recv() returns -guehdr->proto ctype for "resubmit" in ip protocol deliver rcu(), which only functions correctly with non-zero protocol numbers. This can lead to unreferenced objects and a memory leak. The issue was identified by syzbot, a kernel fuzzing tool, which generated a GUE packet triggering the leak. The root cause is related to handling packets with an inner protocol of 0, which is a valid number for IPv6 Hop-by-Hop Options, but not practical for encapsulation within GUE.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Memory Leak
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Weakness Enumeration
Related Identifiers
Affected Products
Linuxmint
Linux Kernel
Ubuntu