{"id":"CVE-2026-23240","summary":"tls: Fix race condition in tls_sw_cancel_work_tx()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntls: Fix race condition in tls_sw_cancel_work_tx()\n\nThis issue was discovered during a code audit.\n\nAfter cancel_delayed_work_sync() is called from tls_sk_proto_close(),\ntx_work_handler() can still be scheduled from paths such as the\nDelayed ACK handler or ksoftirqd.\nAs a result, the tx_work_handler() worker may dereference a freed\nTLS object.\n\nThe following is a simple race scenario:\n\n          cpu0                         cpu1\n\ntls_sk_proto_close()\n  tls_sw_cancel_work_tx()\n                                 tls_write_space()\n                                   tls_sw_write_space()\n                                     if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx-\u003etx_bitmask))\n    set_bit(BIT_TX_SCHEDULED, &ctx-\u003etx_bitmask);\n    cancel_delayed_work_sync(&ctx-\u003etx_work.work);\n                                     schedule_delayed_work(&tx_ctx-\u003etx_work.work, 0);\n\nTo prevent this race condition, cancel_delayed_work_sync() is\nreplaced with disable_delayed_work_sync().","modified":"2026-04-02T13:12:17.037885Z","published":"2026-03-10T17:28:27.371Z","related":["openSUSE-SU-2026:10387-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23240.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23240.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23240"},{"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":"f87e62d45e51b12d48d2cb46b5cde8f83b866bc4"},{"fixed":"a5de36d6cee74a92c1a21b260bc507e64bc451de"},{"fixed":"854cd32bc74fe573353095e90958490e4e4d641b"},{"fixed":"17153f154f80be2b47ebf52840f2d8f724eb2f3b"},{"fixed":"7bb09315f93dce6acc54bf59e5a95ba7365c2be4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23240.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.3.0"},{"fixed":"6.12.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23240.json"}}],"schema_version":"1.7.5"}