CVE-2026-90081
UnknownSummary
In the Linux kernel, net/rds rds_cong_map_updated() uses waitqueue_active() without the required memory barrier, leading to a store-buffering pattern. The updater can observe an empty wait queue while the waiter still sees the port as congested, so no wake-up is issued.
Risk Assessment
A sender blocked on a congested port may stay blocked until the next congestion update or a signal, and a poll() waiter may miss the map-updated notification.
Recommendation
Update the Linux kernel to a version with the fix that uses wq_has_sleeper() (waitqueue_active() preceded by the required full barrier) instead of waitqueue_active().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net/rds: use wq_has_sleeper() in rds_cong_map_updated() rds_cong_map_updated() runs after a peer's congestion map has been rewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the clear-all in the loopback and IB send-completion paths). It bumps rds_cong_generation and then checks waitqueue_active() on map->m_waitq and on rds_poll_waitq to decide whether anyone needs waking. atomic_inc() carries no ordering and waitqueue_active() is a plain load, so nothing orders the map and generation stores before the wait queue reads. The waiters do the mirror image: rds_cong_wait() adds itself to m_waitq and then tests the port bit, and rds_poll() registers on rds_poll_waitq and then reads the generation. That is the store-buffering pattern described above waitqueue_active() in include/linux/wait.h - the updater can observe an empty wait queue while the waiter still observes the port as congested, and no wake-up is issued. rds_cong_wait() is an interruptible sleep with no timeout, so a sender blocked on a congested port stays blocked until the next congestion update from that peer arrives or a signal is delivered. A poll() waiter misses the map-updated notification the same way. Use wq_has_sleeper(), which is waitqueue_active() preceded by the required full barrier, as rds_tcp_state_change() already does for the same pattern.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS