{"id":"CVE-2026-98072","summary":"net/rds: use wq_has_sleeper() in release_in_xmit()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: use wq_has_sleeper() in release_in_xmit()\n\nrelease_in_xmit() clears RDS_IN_XMIT with clear_bit_unlock() and then\nchecks waitqueue_active() to decide whether anyone needs waking.\nclear_bit_unlock() is only a release operation: it orders the\ncritical section before the bit clear, but does not order the\nsubsequent plain load of the wait queue head after it.  The waiter\nside does the mirror image - it adds itself to the wait queue and\nthen tests the bit.  That is the classic store-buffering pattern: the\nreleasing CPU can read the wait queue as empty while the waiting CPU\nstill reads the bit as set, so the sleeper is never woken.\n\nThe waiters are rds_conn_shutdown() and rds_tcp_reset_callbacks(),\nboth in uninterruptible wait_event() with no timeout.  A lost wake-up\nstrands the shutdown worker on its single-threaded workqueue until\nsome other sender releases the bit again - and on a connection that\nis being torn down precisely because it failed, there may never be\nanother sender.\n\nThe barrier used to be there: release_in_xmit() did clear_bit()\nfollowed by smp_mb__after_atomic() until commit 1422f28826d2 (\"rds:\nintroduce acquire/release ordering in acquire/release_in_xmit()\")\nfolded both into clear_bit_unlock(), which strengthened the lock\nhand-off but silently dropped the full barrier the wake-up check\ndepends on.  The refill counterpart, release_refill() in\nnet/rds/ib_recv.c, still carries its smp_mb__after_atomic() for\nexactly this reason.\n\nUse wq_has_sleeper(), which is waitqueue_active() preceded by the\nrequired full barrier.","modified":"2026-11-13T04:07:24.346037935Z","published":"2026-09-25T10:24:12.675Z","related":["SUSE-SU-2026:24550-1","SUSE-SU-2026:24619-1","SUSE-SU-2026:5121-1","openSUSE-SU-2026:12074-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98072.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3764627b30a283e611e652c4a2bb8cdc74a75a99"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d401934b7edb3ccb07d982dabadd04c45ee307c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5a806ed1eb46850ca4159a18b2a8c4b70f0c1341"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6d0c8b7073913011459cf968cbbadd341e166bc3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f552364d97cf4005c7a58f11c9f79e14e269865"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a269795107f45adc95975a83324f8fef40bec4ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a94b1dfc82454c5bc068e71c25393af674daf63b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed7ee0cd0e136d02f87f13181b1a89880463c7e9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98072.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98072"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1e1e4316fcaeb9cd6bc56c91127e88625237dd44"},{"fixed":"6f552364d97cf4005c7a58f11c9f79e14e269865"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8c378cc522aedd5fa5aa53486b43a4d552fbbd5c"},{"fixed":"a94b1dfc82454c5bc068e71c25393af674daf63b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"52287ed416a10bc3d3e204a3186d9509ab3ee634"},{"fixed":"5a806ed1eb46850ca4159a18b2a8c4b70f0c1341"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4a4dffdff9ea6201665f5d0a5042011d09bd527f"},{"fixed":"3d401934b7edb3ccb07d982dabadd04c45ee307c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1422f28826d2a0c11e5240b3e951c9e214d8656e"},{"fixed":"ed7ee0cd0e136d02f87f13181b1a89880463c7e9"},{"fixed":"a269795107f45adc95975a83324f8fef40bec4ce"},{"fixed":"3764627b30a283e611e652c4a2bb8cdc74a75a99"},{"fixed":"6d0c8b7073913011459cf968cbbadd341e166bc3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bec6c4ce1169a565c58c347d5d0ac22e46d507d6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f781fb5177cdfd9a6c98cd94e30275457c6461ac"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"917135195200e20e5244b9c3f2bb40f3d5e02510"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d792459a6e2ae21c7f5107babd63e52e4c5ab93a"}]}],"versions":["v5.10.270","v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.10.264","v5.10.263","v5.10.262","v5.10.261","v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.10.240","v5.10.239","v5.10.238","v5.10.237","v5.10.236","v5.10.235","v5.10.234","v5.10.233","v5.10.232","v5.10.231","v5.10.230","v5.10.229","v5.10.228","v5.10.227","v5.10.226","v5.10.225","v5.10.224","v5.10.223","v5.10.222","v5.10.221","v5.10.220","v5.10.219","v5.10.218","v5.10.217","v5.10.216","v5.10.215","v5.10.214","v5.15.221","v5.15.220","v5.15.219","v5.15.218","v5.15.217","v5.15.216","v5.15.215","v5.15.214","v5.15.213","v5.15.212","v5.15.211","v5.15.210","v5.15.209","v5.15.208","v5.15.207","v5.15.206","v5.15.205","v5.15.204","v5.15.203","v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15.194","v5.15.193","v5.15.192","v5.15.191","v5.15.190","v5.15.189","v5.15.188","v5.15.187","v5.15.186","v5.15.185","v5.15.184","v5.15.183","v5.15.182","v5.15.181","v5.15.180","v5.15.179","v5.15.178","v5.15.177","v5.15.176","v5.15.175","v5.15.174","v5.15.173","v5.15.172","v5.15.171","v5.15.170","v5.15.169","v5.15.168","v5.15.167","v5.15.166","v5.15.165","v5.15.164","v5.15.163","v5.15.162","v5.15.161","v5.15.160","v5.15.159","v5.15.158","v5.15.157","v5.15.156","v5.15.155","v5.15.154","v5.15.153","v6.1.188","v6.1.187","v6.1.186","v6.1.185","v6.1.184","v6.1.183","v6.1.182","v6.1.181","v6.1.180","v6.1.179","v6.1.178","v6.1.177","v6.1.176","v6.1.175","v6.1.174","v6.1.173","v6.1.172",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