CVE-2025-37920
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux AF_XDP generic RX path, a race condition occurs when multiple sockets share the same xsk_buff_pool in umem mode. The rx_lock is moved from xsk_socket to xsk_buff_pool to protect both queues.
Risk Assessment
An attacker could remotely trigger a data race in the AF_XDP RX path, leading to system crashes or potentially privilege escalation.
Recommendation
Apply the Linux kernel patch that moves rx_lock to xsk_buff_pool and synchronizes access to RX and FILL queues.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: xsk: Fix race condition in AF_XDP generic RX path Move rx_lock from xsk_socket to xsk_buff_pool. Fix synchronization for shared umem mode in generic RX path where multiple sockets share single xsk_buff_pool. RX queue is exclusive to xsk_socket, while FILL queue can be shared between multiple sockets. This could result in race condition where two CPU cores access RX path of two different sockets sharing the same umem. Protect both queues by acquiring spinlock in shared xsk_buff_pool. Lock contention may be minimized in the future by some per-thread FQ buffering. It's safe and necessary to move spin_lock_bh(rx_lock) after xsk_rcv_check(): * xs->pool and spinlock_init is synchronized by xsk_bind() -> xsk_is_bound() memory barriers. * xsk_rcv_check() may return true at the moment of xsk_release() or xsk_unbind_dev(), however this will not cause any data races or race conditions. xsk_unbind_dev() removes xdp socket from all maps and waits for completion of all outstanding rx operations. Packets in RX path will either complete safely or drop.