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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-90081

net/rds: use wq_has_sleeper() in rds_cong_map_updated()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 922cb17a5c812fcc9ebee249f4109db099896941 to < 2a809d7896dbf18e1ecfbdd930f71c9fc298b16daffected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < fa4b98e891fda28cc0638d809c6125ec63d8319daffected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < 0e169f6a2adeb17b5577ed7e8abd642465bb50ecaffected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < 42884bd8b8fd023d6a610a695bd5ddd1d5dece17affected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < a526214b9f0548ca0e53a6e0d1727d8ea9befc23affected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5affected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < 281f9fda2e06d6c211bb365a5379ed2e05cc2e21affected
  • 922cb17a5c812fcc9ebee249f4109db099896941 to < d4f484661961636eb90d287050959e613795f73aaffected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 5.10.270 to ≤ 5.10.*unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.110 to ≤ 6.12.*unaffected
  • 6.18.52 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References