CVE-2026-22997 net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts

What is CVE-2026-22997?

CVE-2026-22997 is a high-severity denial of service vulnerability in Linux kernel, published on 25 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-772

Which versions are affected by CVE-2026-22997?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-22997?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-22997 being exploited?

There is no known exploitation of CVE-2026-22997 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-77316, AZL-78479, BELL-CVE-2026-22997, DEBIAN-CVE-2026-22997, GHSA-86mf-f3rq-8369, ROOT-OS-UBUNTU-2204-CVE-2026-22997 and 2 more.