{"id":"CVE-2026-90081","state":"PUBLISHED","title":"net/rds: use wq_has_sleeper() in rds_cong_map_updated()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: use wq_has_sleeper() in rds_cong_map_updated()\n\nrds_cong_map_updated() runs after a peer's congestion map has been\nrewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the\nclear-all in the loopback and IB send-completion paths).  It bumps\nrds_cong_generation and then checks waitqueue_active() on\nmap->m_waitq and on rds_poll_waitq to decide whether anyone needs\nwaking.  atomic_inc() carries no ordering and waitqueue_active() is a\nplain load, so nothing orders the map and generation stores before\nthe wait queue reads.  The waiters do the mirror image: rds_cong_wait()\nadds itself to m_waitq and then tests the port bit, and rds_poll()\nregisters on rds_poll_waitq and then reads the generation.  That is\nthe store-buffering pattern described above waitqueue_active() in\ninclude/linux/wait.h - the updater can observe an empty wait queue\nwhile the waiter still observes the port as congested, and no wake-up\nis issued.\n\nrds_cong_wait() is an interruptible sleep with no timeout, so a\nsender blocked on a congested port stays blocked until the next\ncongestion update from that peer arrives or a signal is delivered.\nA poll() waiter misses the map-updated notification the same way.\n\nUse wq_has_sleeper(), which is waitqueue_active() preceded by the\nrequired full barrier, as rds_tcp_state_change() already does for\nthe same pattern.","publishedAt":"2026-09-17T16:05:58.866Z","updatedAt":"2026-10-19T08:57:37.791Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"2a809d7896dbf18e1ecfbdd930f71c9fc298b16d","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"fa4b98e891fda28cc0638d809c6125ec63d8319d","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"0e169f6a2adeb17b5577ed7e8abd642465bb50ec","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"42884bd8b8fd023d6a610a695bd5ddd1d5dece17","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"a526214b9f0548ca0e53a6e0d1727d8ea9befc23","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"281f9fda2e06d6c211bb365a5379ed2e05cc2e21","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"d4f484661961636eb90d287050959e613795f73a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/cong.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/cong.c"]}],"references":["https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d","https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d","https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec","https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17","https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23","https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5","https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21","https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90081.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90081","state":"PUBLISHED","datePublished":"2026-09-17T16:05:58.866Z","dateUpdated":"2026-10-19T08:57:37.791Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.785Z"},"containers":{"cna":{"title":"net/rds: use wq_has_sleeper() in rds_cong_map_updated()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: use wq_has_sleeper() in rds_cong_map_updated()\n\nrds_cong_map_updated() runs after a peer's congestion map has been\nrewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the\nclear-all in the loopback and IB send-completion paths).  It bumps\nrds_cong_generation and then checks waitqueue_active() on\nmap->m_waitq and on rds_poll_waitq to decide whether anyone needs\nwaking.  atomic_inc() carries no ordering and waitqueue_active() is a\nplain load, so nothing orders the map and generation stores before\nthe wait queue reads.  The waiters do the mirror image: rds_cong_wait()\nadds itself to m_waitq and then tests the port bit, and rds_poll()\nregisters on rds_poll_waitq and then reads the generation.  That is\nthe store-buffering pattern described above waitqueue_active() in\ninclude/linux/wait.h - the updater can observe an empty wait queue\nwhile the waiter still observes the port as congested, and no wake-up\nis issued.\n\nrds_cong_wait() is an interruptible sleep with no timeout, so a\nsender blocked on a congested port stays blocked until the next\ncongestion update from that peer arrives or a signal is delivered.\nA poll() waiter misses the map-updated notification the same way.\n\nUse wq_has_sleeper(), which is waitqueue_active() preceded by the\nrequired full barrier, as rds_tcp_state_change() already does for\nthe same pattern."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"2a809d7896dbf18e1ecfbdd930f71c9fc298b16d","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"fa4b98e891fda28cc0638d809c6125ec63d8319d","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"0e169f6a2adeb17b5577ed7e8abd642465bb50ec","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"42884bd8b8fd023d6a610a695bd5ddd1d5dece17","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"a526214b9f0548ca0e53a6e0d1727d8ea9befc23","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"281f9fda2e06d6c211bb365a5379ed2e05cc2e21","versionType":"git"},{"version":"922cb17a5c812fcc9ebee249f4109db099896941","status":"affected","lessThan":"d4f484661961636eb90d287050959e613795f73a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/cong.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/cong.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d"},{"url":"https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d"},{"url":"https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec"},{"url":"https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17"},{"url":"https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23"},{"url":"https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5"},{"url":"https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21"},{"url":"https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:57:37.791Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}