CVE-2025-37920 — xsk: Fix race condition in AF_XDP generic RX path

Affected: Linux

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.

USN-7649-1 — linux, linux-gcp, linux-raspi, linux-realtime vulnerabilities

Affected: Ubuntu:25.04: linux, Ubuntu:25.04: linux-gcp, Ubuntu:25.04: linux-raspi, Ubuntu:25.04: linux-realtime

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM64 architecture; - PA-RISC architecture; - PowerPC architecture; - S390 architecture; - x86 architecture; - Compute Acceleration Framework; - Ublk userspace block driver; - Bluetooth drivers; - ARM SCMI message protocol; - GPU drivers; - IOMMU subsystem; - IRQ chip drivers; - Multiple devices driver; - Network drivers; - PCI subsystem; - PTP clock framework; - SPI subsystem; - BTRFS file system; - SMB network file system; - eXpress Data Path; - Universal MIDI packet (UMP) support module; - Tracing infrastructure; - Memory management; - IPv4 networking; - IPv6 networking; - Network traffic control; - AMD SoC Alsa drivers; - SoC Audio generic drivers; (CVE-2025-37898, CVE-2025-37990, CVE-2025-37974, CVE-2025-37991, CVE-2025-37894, CVE-2025-37906, CVE-2025-37896, CVE-2025-37909, CVE-2025-37923, CVE-2025-37899, CVE-2025-37901, CVE-2025-37914, CVE-2025-38216, CVE-2025-37931, CVE-2025-37928, CVE-2025-37916, CVE-2025-37908, CVE-2025-37915, CVE-2025-37917, CVE-2025-37921, CVE-2025-37903, CVE-2025-37922, CVE-2025-37895, CVE-2025-37936, CVE-2025-37933, CVE-2025-37891, CVE-2025-37926, CVE-2025-37912, CVE-2025-37920, CVE-2025-37924, CVE-2025-37927, CVE-2025-37946, CVE-2025-37907, CVE-2025-37930, CVE-2025-37911, CVE-2025-37905, CVE-2025-37900, CVE-202…

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CVE-2025-37920 — xsk: Fix race condition in AF_XDP generic RX path

USN-7649-1 — linux, linux-gcp, linux-raspi, linux-realtime vulnerabilities