CVE-2026-97413 RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
A malicious RDMA client can trigger an integer underflow in the Linux kernel, leading to out-of-bounds memory access and potential code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-97413?
CVE-2026-97413 is a critical vulnerability in Linux, published on 24 Sep 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:
RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
usr_len is read from a network-supplied message field (le16_to_cpu) and used to compute data_len = off - usr_len without validating that usr_len <= off. A malicious RDMA client can send usr_len > off causing an integer underflow, resulting in data_len wrapping to a huge size_t value which is then passed to the rdma_ev callback as a memory length, leading to out-of-bounds memory access.
Fix by reading and validating usr_len <= off before rtrs_srv_get_ops_ids() in both process_read() and process_write(), ensuring the early return path acquires no reference and has no resource leak.
Which versions are affected by CVE-2026-97413?
How do I fix CVE-2026-97413?
Apply the vendor's patch.
Is CVE-2026-97413 being exploited?
There is no known exploitation of CVE-2026-97413 in the wild and no public exploit code.
Sources
Also known as AZL-103829, BELL-CVE-2026-97413, DEBIAN-CVE-2026-97413, GHSA-wv45-qhgq-9h5f, UBUNTU-CVE-2026-97413.