{"id":"CVE-2026-90235","title":"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->sk_data_ready and\nsk->sk_write_space on live sockets wi…","summary":"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->sk_data_ready and\nsk->sk_write_space on live sockets wi…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 < ed80d009b154aa204f541d390884851b3d4f15ae","Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 < 589f761236e05ff9de1bdfd6a5258f113e6457fe","Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 < da652cb17f9faeea1fa44b7215e8869a0b10b664","Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 < d8f0b83753809761a560c4b33249388548ba6e43","Linux >= a246b0105bbd9a70a698f69baae2042996f2a0e9 < 33930840b5f0a79f826e7c69dc6cd78f72a67481","Linux 2.6.15"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:48.413","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90235","references":[{"url":"https://git.kernel.org/stable/c/33930840b5f0a79f826e7c69dc6cd78f72a67481","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/589f761236e05ff9de1bdfd6a5258f113e6457fe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d8f0b83753809761a560c4b33249388548ba6e43","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/da652cb17f9faeea1fa44b7215e8869a0b10b664","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ed80d009b154aa204f541d390884851b3d4f15ae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00626,"epssPercentile":0.48642,"ingestedAt":"2026-09-17T16:21:47.850Z","slug":"CVE-2026-90235","body":"## Overview\n\nIn 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->sk_data_ready and\nsk->sk_write_space on live sockets with plain stores, and\nxs_udp_do_set_buffer_size() invokes sk->sk_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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207203,"id":"CVE-2026-90235","ts":1789757339575,"field":"cvss","old":null,"new":"9.8"},{"seq":207202,"id":"CVE-2026-90235","ts":1789757339575,"field":"severity","old":"none","new":"critical"}]}