{"id":"CVE-2026-90235","summary":"sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE\n\nxprtsock replaces and restores sk-\u003esk_data_ready and\nsk-\u003esk_write_space on live sockets with plain stores, and\nxs_udp_do_set_buffer_size() invokes sk-\u003esk_write_space via a plain\nload. These callback pointers are shared with generic socket and\nprotocol paths that may read or invoke them concurrently, so xprtsock\nneeds the same READ_ONCE()/WRITE_ONCE() callback visibility contract\nthat the validated 4022 family applied elsewhere.\n\nWhen SUNRPC takes over an AF_LOCAL, UDP, or TCP socket and later\nrestores the lower-socket callbacks during teardown, another CPU may\nstill hold an earlier callback snapshot. The plain replace/restore\npattern leaves the same visibility hole as the validated 4022 family,\nso a stale snapshot can still invoke xs_data_ready() or\nxs_udp_write_space() after the live callback fields have already been\nrestored to the lower-socket handlers.\n\nUse WRITE_ONCE() for the shared sk_data_ready and sk_write_space\nstores in xs_local_finish_connecting(), xs_udp_finish_connecting(),\nxs_tcp_finish_connecting(), and xs_restore_old_callbacks(). Use\nREAD_ONCE() for the direct sk_write_space invocation in\nxs_udp_do_set_buffer_size(). This matches the required callback\nvisibility contract while leaving adjacent sk_state_change and\nsk_error_report handling unchanged.","modified":"2026-09-18T03:48:36.444732797Z","published":"2026-09-17T16:07:41.251Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90235.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481"},{"type":"WEB","url":"https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90235.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90235"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a246b0105bbd9a70a698f69baae2042996f2a0e9"},{"fixed":"ed80d009b154aa204f541d390884851b3d4f15ae"},{"fixed":"589f761236e05ff9de1bdfd6a5258f113e6457fe"},{"fixed":"da652cb17f9faeea1fa44b7215e8869a0b10b664"},{"fixed":"d8f0b83753809761a560c4b33249388548ba6e43"},{"fixed":"33930840b5f0a79f826e7c69dc6cd78f72a67481"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90235.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.15"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90235.json"}}],"schema_version":"1.9.0"}