{"api_version":"1","generated_at":"2026-10-12T03:24:42+00:00","cve":"CVE-2026-90081","urls":{"html":"https://cve.report/CVE-2026-90081","api":"https://cve.report/api/cve/CVE-2026-90081.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90081","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90081"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:16:57","updated_at":"2026-09-17 17:16:57"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d","name":"https://git.kernel.org/stable/c/2a809d7896dbf18e1ecfbdd930f71c9fc298b16d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23","name":"https://git.kernel.org/stable/c/a526214b9f0548ca0e53a6e0d1727d8ea9befc23","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5","name":"https://git.kernel.org/stable/c/bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d","name":"https://git.kernel.org/stable/c/fa4b98e891fda28cc0638d809c6125ec63d8319d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a","name":"https://git.kernel.org/stable/c/d4f484661961636eb90d287050959e613795f73a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21","name":"https://git.kernel.org/stable/c/281f9fda2e06d6c211bb365a5379ed2e05cc2e21","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17","name":"https://git.kernel.org/stable/c/42884bd8b8fd023d6a610a695bd5ddd1d5dece17","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec","name":"https://git.kernel.org/stable/c/0e169f6a2adeb17b5577ed7e8abd642465bb50ec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90081","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90081","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 2a809d7896dbf18e1ecfbdd930f71c9fc298b16d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 fa4b98e891fda28cc0638d809c6125ec63d8319d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 0e169f6a2adeb17b5577ed7e8abd642465bb50ec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 42884bd8b8fd023d6a610a695bd5ddd1d5dece17 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 a526214b9f0548ca0e53a6e0d1727d8ea9befc23 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 281f9fda2e06d6c211bb365a5379ed2e05cc2e21 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 922cb17a5c812fcc9ebee249f4109db099896941 d4f484661961636eb90d287050959e613795f73a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.30","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.30 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/rds/cong.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2a809d7896dbf18e1ecfbdd930f71c9fc298b16d","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"fa4b98e891fda28cc0638d809c6125ec63d8319d","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"0e169f6a2adeb17b5577ed7e8abd642465bb50ec","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"42884bd8b8fd023d6a610a695bd5ddd1d5dece17","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"a526214b9f0548ca0e53a6e0d1727d8ea9befc23","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"281f9fda2e06d6c211bb365a5379ed2e05cc2e21","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"},{"lessThan":"d4f484661961636eb90d287050959e613795f73a","status":"affected","version":"922cb17a5c812fcc9ebee249f4109db099896941","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/rds/cong.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.30"},{"lessThan":"2.6.30","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"2.6.30","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"2.6.30","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:05:58.866Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"net/rds: use wq_has_sleeper() in rds_cong_map_updated()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90081","datePublished":"2026-09-17T16:05:58.866Z","dateReserved":"2026-09-11T19:38:34.785Z","dateUpdated":"2026-09-17T16:05:58.866Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:16:57","lastModifiedDate":"2026-09-17 17:16:57","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90081","Ordinal":"1","Title":"net/rds: use wq_has_sleeper() in rds_cong_map_updated()","CVE":"CVE-2026-90081","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90081","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net/rds: use wq_has_sleeper() in rds_cong_map_updated()"}]}}}