EUVD-2026-25531
GHSA-5vqj-w88j-2624
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
8DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Only put the call ref if one was acquired
rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop.
The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet.
Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged.
AnalysisAI
Null pointer dereference in Linux kernel rxrpc subsystem allows remote network attackers to crash the system by sending malformed packets to a client-side connection after a call has been torn down. The flaw affects Linux kernel versions 6.2 onward where the rxrpc client code unconditionally releases a call reference that was never acquired, converting a protocol error into a kernel panic. …
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RemediationAI
Within 24 hours: Inventory all Linux systems running kernel versions 6.2-7.0 and identify those with active rxrpc usage (check for AFS, kerberos, or custom rxrpc implementations). Within 7 days: Apply vendor-released patches to all affected systems-specifically kernel versions 6.6.135, 6.12.82, 6.18.23, 6.19.13, or 7.0 or later depending on your deployed kernel line. …
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