CVE-2025-21670 Information

Description

In the Linux kernel the following vulnerability has been resolved:

vsock/bpf: return early if transport is not assigned

Some of the core functions can only be called if the transport has been assigned.

As Michal reported a socket might have the transport at NULL for example after a failed connect() causing the following trace:

BUG: kernel NULL pointer dereference address: 00000000000000a0
PF: supervisor read access in kernel mode
PF: error_code(0x0000) - not-present page
PGD 12faf8067 P4D 12faf8067 PUD 113670067 PMD 0
Oops: Oops: 0000 [1] PREEMPT SMP NOPTI
CPU: 15 UID: 0 PID: 1198 Comm: a.out Not tainted 6.13.0-rc2+
RIP: 0010:vsock_connectible_has_data+0x1f/0x40
Call Trace:
 vsock_bpf_recvmsg+0xca/0x5e0
 sock_recvmsg+0xb9/0xc0
 __sys_recvfrom+0xb3/0x130
 __x64_sys_recvfrom+0x20/0x30
 do_syscall_64+0x93/0x180
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

So we need to check the vsk->transport in vsock_bpf_recvmsg() especially for connected sockets (stream/seqpacket) as we already do in __vsock_connectible_recvmsg().

Reference

https://git.kernel.org/stable/c/58e586c30d0b6f5dc0174a41026f2b0a48c9aab6 https://git.kernel.org/stable/c/6771e1279dadf1d92a72e1465134257d9e6f2459 https://git.kernel.org/stable/c/f6abafcd32f9cfc4b1a2f820ecea70773e26d423