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How the mentioned CVE works:
A race condition exists in the Linux kernel’s rxrpc subsystem. When processing data for a call, multiple `recvmsg` threads can simultaneously access the same call structure. The first thread processes events and may terminate the call, releasing its associated user ID. When a second, blocked thread subsequently acquires the mutex, it finds the call has been released. Attempting to use this released call structure triggers a kernel BUG due to a use-after-free condition, potentially leading to a denial of service or other instability.
Platform: Linux Kernel
Version: Up to fix
Vulnerability: Use-After-Free
Severity: Critical
date: 2025-08-16
Prediction: Patch expected by 2025-08-30
What Undercode Say:
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`grep -r “rxrpc_recvmsg” /usr/src/linux-source/`
`cat /proc/sys/net/rxrpc/max_call_lifetime`
`dmesg | grep “kernel BUG.net/rxrpc/recvmsg.c:474″`
How Exploit:
Craft high-volume, concurrent RPC traffic to target system. Multiple clients repeatedly call recvmsg on the same socket. This triggers the race condition, causing a kernel panic and system crash.
Protection from this CVE
Apply kernel patch.
Disable rxrpc module.
Use firewall rules.
Impact:
Kernel panic.
Denial of Service.
System instability.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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