CVE-2026-74345 RDMA/siw: Fix endpoint/socket association handling
A use-after-free vulnerability in the Linux kernel's RDMA/siw driver allows attackers to cause a denial of service or potentially execute code via malformed MPA requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74345?
CVE-2026-74345 is a critical use after free vulnerability in Linux, published on 15 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:
RDMA/siw: Fix endpoint/socket association handling
Disassociating a socket from an endpoint via siw_socket_disassoc() may release the last reference on that endpoint and free it. Therefore, don't clear the endpoints socket pointer after calling that function, but within.
This fixes a:
BUG: KASAN: slab-use-after-free in siw_cm_work_handler (drivers/infiniband/sw/siw/siw_cm.c:1053 drivers/infiniband/sw/siw/siw_cm.c:1075)
which occurred after processing a malformed MPA request during connection establishment, causing the new endpoint to be closed.
Which versions are affected by CVE-2026-74345?
How do I fix CVE-2026-74345?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-74345 being exploited?
There is no known exploitation of CVE-2026-74345 in the wild and no public exploit code.
Sources
Also known as AZL-96228, BELL-CVE-2026-74345, DEBIAN-CVE-2026-74345, GHSA-qccr-c782-7qrw, UBUNTU-CVE-2026-74345.