{"id":"CVE-2026-90081","revision":"5cadb61381d7481880ba9f61d0332387","records":[{"revision":"5cadb61381d7481880ba9f61d0332387","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90081","aliases":[],"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":0,"publishedAt":"2026-09-17T16:05:58.866+00:00","modifiedAt":"2026-10-19T08:57:37.791+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/rds/cong.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"2a809d7896dbf18e1ecfbdd930f71c9fc298b16d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"fa4b98e891fda28cc0638d809c6125ec63d8319d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"0e169f6a2adeb17b5577ed7e8abd642465bb50ec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"42884bd8b8fd023d6a610a695bd5ddd1d5dece17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"a526214b9f0548ca0e53a6e0d1727d8ea9befc23\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"281f9fda2e06d6c211bb365a5379ed2e05cc2e21\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"922cb17a5c812fcc9ebee249f4109db099896941\",\n                            \"lessThan\": \"d4f484661961636eb90d287050959e613795f73a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/rds/cong.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.30\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.30\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90081","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90081","identifiers":["CVE-2026-90081"]},"retained":false,"historicalAffected":[]}],"coverage":[]}