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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90081
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:57 UTC
Updated2026-09-17 17:16:57 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 2a809d7896dbf18e1ecfbdd930f71c9fc298b16d git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 fa4b98e891fda28cc0638d809c6125ec63d8319d git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 0e169f6a2adeb17b5577ed7e8abd642465bb50ec git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 42884bd8b8fd023d6a610a695bd5ddd1d5dece17 git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 a526214b9f0548ca0e53a6e0d1727d8ea9befc23 git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5 git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 281f9fda2e06d6c211bb365a5379ed2e05cc2e21 git Not specified
CNA Linux Linux affected 922cb17a5c812fcc9ebee249f4109db099896941 d4f484661961636eb90d287050959e613795f73a git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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