CVE-2026-97435 net: dsa: sja1105: flower: reject cross-chip redirect
A local attacker can trigger an out-of-bounds access or incorrect port redirection in the sja1105 DSA driver by configuring cross-chip flower rules.
- 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-2026-97435?
CVE-2026-97435 is a memory corruption vulnerability in Linux, published on 24 Sep 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: dsa: sja1105: flower: reject cross-chip redirect
dsa_port_from_netdev() may return a valid port from a different switch chip. Programming another chip's port index into the local hardware causes redirection to the wrong port, or an out-of-bounds access if the index exceeds the local chip's port count.
Apply a minimal fix that adds a check to catch this case and adjusts the extack message. When cls->common.skip_sw is not set, the operation could instead redirect to the upstream port and let the software or upstream switch(es) handle the forward, but that is not addressed here.
Which versions are affected by CVE-2026-97435?
How do I fix CVE-2026-97435?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-97435 being exploited?
There is no known exploitation of CVE-2026-97435 in the wild and no public exploit code.
Sources
Also known as AZL-103799, BELL-CVE-2026-97435, DEBIAN-CVE-2026-97435, GHSA-fv9v-g8xq-3w88, UBUNTU-CVE-2026-97435.