CVE-2026-74737 net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
A flaw in the TI AM65 CPSW driver allows out-of-bounds memory access due to incorrect port ID extraction, leading to kernel crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74737?
CVE-2026-74737 is a critical memory corruption vulnerability in Linux, published on 26 Aug 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: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
On the packet reception path, the ID of the MAC Port on which the packet was received, is embedded in the RX DMA Descriptor's metadata. The ID is extracted using the helper function cppi5_desc_get_tags_ids() which fills in the 16-bit Source Tag into the 'port_id' variable. However, it is only the lower 8-bits of the 16-bit Source Tag that represent the MAC Port ID, while the upper 8-bits are Hardware-Reserved and carry an arbitrary value. With the existing logic, sporadic kernel crash is observed due to the subsequent driver code accessing out-of-bound memory because of an invalid port_id.
Hence, fix the port_id extraction logic to use only the lower 8-bits of the Source Tag as the MAC Port ID.
Which versions are affected by CVE-2026-74737?
How do I fix CVE-2026-74737?
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-2026-74737 being exploited?
There is no known exploitation of CVE-2026-74737 in the wild and no public exploit code.
Sources
Also known as AZL-97797, BELL-CVE-2026-74737, DEBIAN-CVE-2026-74737, GHSA-582m-3r7c-4438, UBUNTU-CVE-2026-74737.