Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc
rxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the rxrpc_call.rx_dec_buffer is unallocated and assumes that upon successful return that rx_dec_buffer must be allocated. However, rxrpc_verify_data() does not request an allocation if the rxrpc_skb_priv.len is zero.
In addition, failure to allocate rx_dec_buffer will result in a call to skb_copy_bits() with a NULL destination which can trigger a NULL pointer dereference.
To prevent these issues rxrpc_verify_data() is modified to always attempt to allocate the rxrpc_call.rx_dec_buffer if it is NULL.
This issue was identified with assistance of a private sashiko instance.
Details
- Affected product:
- Debian 10 ELS
- Affected packages:
- linux @ 4.19.0