CVE-2026-74432 rxrpc: Fix leak of released call in recvmsg(MSG_PEEK)
A local attacker can cause a memory leak in the Linux kernel's rxrpc module via recvmsg with MSG_PEEK, leading to resource exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74432?
CVE-2026-74432 is a denial of service vulnerability in Linux, published on 15 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Fix leak of released call in recvmsg(MSG_PEEK)
Fix rxrpc_recvmsg() to also drop the ref it holds on an already-released call if MSG_PEEK is in force (the function holds a ref on the call irrespective of whether MSG_PEEK is specified or not).
Which versions are affected by CVE-2026-74432?
How do I fix CVE-2026-74432?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-74432 being exploited?
There is no known exploitation of CVE-2026-74432 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74432, DEBIAN-CVE-2026-74432, GHSA-mhvf-j96m-638q, UBUNTU-CVE-2026-74432.