What’s Vulnerable › Vulnerabilities

CVE-2026-80707: can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-16

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]

Affected products

• Linux kernel: 5.4 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

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

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