CVE-2026-68354 firewire: net: Fix fragmented datagram reassembly
A null pointer dereference in the Linux kernel's FireWire network driver can cause a denial of service during fragmented datagram reassembly.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68354?
CVE-2026-68354 is a high-severity vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
firewire: net: Fix fragmented datagram reassembly
fwnet_frag_new() keeps a sorted list of received fragments for a partial datagram. When a new fragment is adjacent to an existing fragment, the code checks whether the new fragment also closes the gap to the next or previous list entry.
Those neighbor lookups currently assume that the current fragment always has a real next or previous fragment. At a list edge, the next or previous entry is the list head, not a struct fwnet_fragment_info.
The gap checks also compare against the old edge of the current fragment instead of the edge after adding the new fragment. As a result, a fragment that bridges two existing ranges may leave two adjacent ranges unmerged, so fwnet_pd_is_complete() can miss a complete datagram.
Check for the list head before looking up the neighboring fragment, and compare the neighbor against the new fragment's far edge when deciding whether to merge all three ranges.
This issue was found by a static analysis checker and confirmed by manual source review.
Weakness: CWE-476
Which versions are affected by CVE-2026-68354?
How do I fix CVE-2026-68354?
Apply the vendor's patch.
Is CVE-2026-68354 being exploited?
There is no known exploitation of CVE-2026-68354 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68354, DEBIAN-CVE-2026-68354, GHSA-pcmh-x4q7-gxf9, UBUNTU-CVE-2026-68354.