CVE-2026-74288 net: fib_rules: Don't dump dying fib_rule in fib_rules_dump().
A race condition in the Linux kernel's FIB rules dump can cause a refcount warning or crash when accessing dying rules, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74288?
CVE-2026-74288 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: fib_rules: Don't dump dying fib_rule in fib_rules_dump().
rocker_router_fib_event() calls fib_rule_get() during RCU dump.
If the fib_rule is dying, refcount_inc() will complain about it.
Let's call refcount_inc_not_zero() in fib_rules_dump().
Which versions are affected by CVE-2026-74288?
How do I fix CVE-2026-74288?
Apply the vendor's patch.
Is CVE-2026-74288 being exploited?
There is no known exploitation of CVE-2026-74288 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74288, DEBIAN-CVE-2026-74288, GHSA-mfph-jxq2-hg99, UBUNTU-CVE-2026-74288.