{"id":"CVE-2026-23240","revision":"84ab357369af4eeb99991ef89430fa44","records":[{"revision":"84ab357369af4eeb99991ef89430fa44","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23240","aliases":[],"title":"tls: Fix race condition in tls_sw_cancel_work_tx()","description":"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->tx_bitmask))\n    set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);\n    cancel_delayed_work_sync(&ctx->tx_work.work);\n                                     schedule_delayed_work(&tx_ctx->tx_work.work, 0);\n\nTo prevent this race condition, cancel_delayed_work_sync() is\nreplaced with disable_delayed_work_sync().","state":0,"publishedAt":"2026-03-10T17:28:27.371+00:00","modifiedAt":"2026-10-19T18:35:39.775+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/tls/tls_sw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f87e62d45e51b12d48d2cb46b5cde8f83b866bc4\",\n                            \"lessThan\": \"a5de36d6cee74a92c1a21b260bc507e64bc451de\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f87e62d45e51b12d48d2cb46b5cde8f83b866bc4\",\n                            \"lessThan\": \"854cd32bc74fe573353095e90958490e4e4d641b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f87e62d45e51b12d48d2cb46b5cde8f83b866bc4\",\n                            \"lessThan\": \"17153f154f80be2b47ebf52840f2d8f724eb2f3b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f87e62d45e51b12d48d2cb46b5cde8f83b866bc4\",\n                            \"lessThan\": \"7bb09315f93dce6acc54bf59e5a95ba7365c2be4\",\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/tls/tls_sw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.16\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.6\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/a5de36d6cee74a92c1a21b260bc507e64bc451de","https://git.kernel.org/stable/c/854cd32bc74fe573353095e90958490e4e4d641b","https://git.kernel.org/stable/c/17153f154f80be2b47ebf52840f2d8f724eb2f3b","https://git.kernel.org/stable/c/7bb09315f93dce6acc54bf59e5a95ba7365c2be4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23240","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23240","identifiers":["CVE-2026-23240"]},"retained":false,"historicalAffected":[]}],"coverage":[]}