CVE-2026-31638
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.44% probability · 37th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452dPatch
- https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5Patch
- https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4Patch
- https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38Patch
- https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1ddPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.