{"id":"CVE-2022-50697","revision":"03c036965ded4d23b7275a5b6f8f25c4","records":[{"revision":"03c036965ded4d23b7275a5b6f8f25c4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2022-50697","aliases":[],"title":"mrp: introduce active flags to prevent UAF when applicant uninit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmrp: introduce active flags to prevent UAF when applicant uninit\n\nThe caller of del_timer_sync must prevent restarting of the timer, If\nwe have no this synchronization, there is a small probability that the\ncancellation will not be successful.\n\nAnd syzbot report the fellowing crash:\n==================================================================\nBUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline]\nBUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\nWrite at addr f9ff000024df6058 by task syz-fuzzer/2256\nPointer tag: [f9], memory tag: [fe]\n\nCPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008-\nge01d50cbd6ee #0\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156\n dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]\n show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x1a8/0x4a0 mm/kasan/report.c:395\n kasan_report+0x94/0xb4 mm/kasan/report.c:495\n __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320\n do_bad_area arch/arm64/mm/fault.c:473 [inline]\n do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749\n do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825\n el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367\n el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427\n el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576\n hlist_add_head include/linux/list.h:929 [inline]\n enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\n mod_timer+0x14/0x20 kernel/time/timer.c:1161\n mrp_periodic_timer_arm net/802/mrp.c:614 [inline]\n mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627\n call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474\n expire_timers+0x98/0xc4 kernel/time/timer.c:1519\n\nTo fix it, we can introduce a new active flags to make sure the timer will\nnot restart.","state":0,"publishedAt":"2025-12-24T10:55:13.762+00:00","modifiedAt":"2026-10-15T21:41:22.92+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                        \"include/net/mrp.h\",\n                        \"net/802/mrp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"98f53e591940e4c3818be358c5dc684d5b30cb56\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"78d48bc41f7726113c9f114268d3ab11212814da\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"aadb1507a77b060c529edfeaf67f803e31461f24\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"755eb0879224ffc2a43de724554aeaf0e51e5a64\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"5d5a481a7fd0234f617535dc464ea010804a1129\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"563e45fd5046045cc194af3ba17f5423e1c98170\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"febf018d22347b5df94066bca05d0c11a84e839d\",\n                            \"lessThan\": \"ab0377803dafc58f1e22296708c1c28e309414d6\",\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                        \"include/net/mrp.h\",\n                        \"net/802/mrp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.9.337\",\n                            \"lessThanOrEqual\": \"4.9.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.14.303\",\n                            \"lessThanOrEqual\": \"4.14.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.19.270\",\n                            \"lessThanOrEqual\": \"4.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.229\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.163\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.86\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.0.16\",\n                            \"lessThanOrEqual\": \"6.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.2\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.2\",\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/98f53e591940e4c3818be358c5dc684d5b30cb56","https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9","https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da","https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24","https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64","https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129","https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6","https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170","https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50697","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-50697","identifiers":["CVE-2022-50697"]},"retained":false,"historicalAffected":[]}],"coverage":[]}