Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().
lockdep_sock_is_held() was added in tcp_ao_established_key() by the cited commit.
It can be called from tcp_v[46]_timewait_ack() with twsk.
Since it does not have sk->sk_lock, the lockdep annotation results in out-of-bound access.
$ pahole -C tcp_timewait_sock vmlinux | grep size /* size: 288, cachelines: 5, members: 8 / $ pahole -C sock vmlinux | grep sk_lock socket_lock_t sk_lock; / 440 192 */
Let’s not use lockdep_sock_is_held() for TCP_TIME_WAIT.
Details
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| Ubuntu 24.04 | Planned | — |