{"id":"CVE-2026-43499","revision":"7de8a5f07d0c4e96bc57157dd8b5be4e","records":[{"revision":"7de8a5f07d0c4e96bc57157dd8b5be4e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43499","aliases":[],"title":"rtmutex: Use waiter::task instead of current in remove_waiter()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrtmutex: Use waiter::task instead of current in remove_waiter()\n\nremove_waiter() is used by the slowlock paths, but it is also used for\nproxy-lock rollback in rt_mutex_start_proxy_lock() when invoked from\nfutex_requeue().\n\nIn the latter case waiter::task is not current, but remove_waiter()\noperates on current for the dequeue operation. That results in several\nproblems:\n\n  1) the rbtree dequeue happens without waiter::task::pi_lock being held\n\n  2) the waiter task's pi_blocked_on state is not cleared, which leaves a\n     dangling pointer primed for UAF around.\n\n  3) rt_mutex_adjust_prio_chain() operates on the wrong top priority waiter\n     task\n\nUse waiter::task instead of current in all related operations in\nremove_waiter() to cure those problems.\n\n[ tglx: Fixup rt_mutex_adjust_prio_chain(), add a comment and amend the\n  \tchangelog ]","state":0,"publishedAt":"2026-05-21T12:17:49.281+00:00","modifiedAt":"2026-10-15T01:19:29.734+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                        \"kernel/locking/rtmutex.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"f3fa3424bceb128d2be4b3745506b22844b87db7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"d8cce4773c2b23d819baf5abedc62f7b430e8745\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"8a1fc8d698ac5e5916e3082a0f74450d71f9611f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"6d52dfcb2a5db86e346cf51f8fcf2071b8085166\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"3fb7394a837740770f0d6b4b30567e60786a63f2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"88614876370aac8ad1050ad785a4c095ba17ac11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8161239a8bcce9ad6b537c04a1fa3b5c68bae693\",\n                            \"lessThan\": \"3bfdc63936dd4773109b7b8c280c0f3b5ae7d349\",\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                        \"kernel/locking/rtmutex.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.39\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.39\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.140\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.86\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.27\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.4\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f3fa3424bceb128d2be4b3745506b22844b87db7","https://git.kernel.org/stable/c/838ce5cb5d93c3ab8b27e75bc6ad905a94b752fd","https://git.kernel.org/stable/c/d8cce4773c2b23d819baf5abedc62f7b430e8745","https://git.kernel.org/stable/c/8a1fc8d698ac5e5916e3082a0f74450d71f9611f","https://git.kernel.org/stable/c/6d52dfcb2a5db86e346cf51f8fcf2071b8085166","https://git.kernel.org/stable/c/3fb7394a837740770f0d6b4b30567e60786a63f2","https://git.kernel.org/stable/c/88614876370aac8ad1050ad785a4c095ba17ac11","https://git.kernel.org/stable/c/3bfdc63936dd4773109b7b8c280c0f3b5ae7d349"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43499","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43499","identifiers":["CVE-2026-43499"]},"retained":false,"historicalAffected":[]}],"coverage":[]}