{"api_version":"1","generated_at":"2026-10-29T10:58:22+00:00","cve":"CVE-2022-50697","urls":{"html":"https://cve.report/CVE-2022-50697","api":"https://cve.report/api/cve/CVE-2022-50697.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-50697","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-50697"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2025-12-24 11:15:48","updated_at":"2026-10-15 22:17:32"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6","name":"https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64","name":"https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129","name":"https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56","name":"https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da","name":"https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170","name":"https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9","name":"https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6","name":"https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24","name":"https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-50697","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50697","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected febf018d22347b5df94066bca05d0c11a84e839d 98f53e591940e4c3818be358c5dc684d5b30cb56 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected febf018d22347b5df94066bca05d0c11a84e839d aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected febf018d22347b5df94066bca05d0c11a84e839d 78d48bc41f7726113c9f114268d3ab11212814da git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected febf018d22347b5df94066bca05d0c11a84e839d aadb1507a77b060c529edfeaf67f803e31461f24 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.9.337 4.9.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.14.303 4.14.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19.270 4.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.229 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.163 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.86 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0.16 6.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.2 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2022","cve_id":"50697","cve":"CVE-2022-50697","epss":"0.001580000","percentile":"0.044430000","score_date":"2026-10-15","updated_at":"2026-10-16 00:06:11"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2022-50697","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-10-15T21:32:05.442403Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-10-15T21:41:22.920Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/mrp.h","net/802/mrp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"98f53e591940e4c3818be358c5dc684d5b30cb56","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"78d48bc41f7726113c9f114268d3ab11212814da","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"aadb1507a77b060c529edfeaf67f803e31461f24","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"755eb0879224ffc2a43de724554aeaf0e51e5a64","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"5d5a481a7fd0234f617535dc464ea010804a1129","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"563e45fd5046045cc194af3ba17f5423e1c98170","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"},{"lessThan":"ab0377803dafc58f1e22296708c1c28e309414d6","status":"affected","version":"febf018d22347b5df94066bca05d0c11a84e839d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/mrp.h","net/802/mrp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.9"},{"lessThan":"3.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"4.9.*","status":"unaffected","version":"4.9.337","versionType":"semver"},{"lessThanOrEqual":"4.14.*","status":"unaffected","version":"4.14.303","versionType":"semver"},{"lessThanOrEqual":"4.19.*","status":"unaffected","version":"4.19.270","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.229","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.163","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.86","versionType":"semver"},{"lessThanOrEqual":"6.0.*","status":"unaffected","version":"6.0.16","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.9.337","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.14.303","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.19.270","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.229","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.163","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.86","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.0.16","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.2","versionStartIncluding":"3.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.2","versionStartIncluding":"3.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The UAF is triggered by locally creating and destroying a VLAN device (rtnetlink/ioctl → register_vlan_dev/unregister_vlan_dev → mrp_init_applicant/mrp_uninit_applicant), not by processing remote or adjacent MRP frames on the mrp_rcv path.\nAC:L - The attacker controls applicant teardown by repeatedly creating and deleting the last VLAN on a device while the join (~200ms) and periodic (1s) timers self-rearm, and can retry until del_timer_sync loses the restart race; this matches attacker-driven timer/teardown races scored AC:L.\nPR:L - VLAN create/delete requires CAP_NET_ADMIN checked with ns_capable/sk_ns_capable against the net's user_ns, which an unprivileged user obtains via user namespaces (e.g. unshare -Urn with veth+vlan), so privileges are Low not High.\nUI:N - The attacker alone creates and destroys VLAN interfaces to drive the race; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - Impact is a host-kernel heap use-after-free and potential privilege escalation within the same OS security authority, not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The freed mrp_applicant (including embedded timer_list and applicant state) is subject to heap reclaim; per UAF guidance this enables arbitrary kernel memory disclosure primitives.\nI:H - KASAN shows a write-after-free in enqueue_timer/mod_timer on the freed applicant, and later timer callbacks continue using the reclaimed object, yielding heap write and control-flow hijack primitives.\nA:H - The confirmed KASAN use-after-free already oopses/crashes the kernel when the rearmed periodic timer runs on freed memory, so availability impact is High."}]}],"providerMetadata":{"dateUpdated":"2026-08-05T08:59:24.625Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56"},{"url":"https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9"},{"url":"https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da"},{"url":"https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24"},{"url":"https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64"},{"url":"https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129"},{"url":"https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6"},{"url":"https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170"},{"url":"https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6"}],"title":"mrp: introduce active flags to prevent UAF when applicant uninit","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2022-50697","datePublished":"2025-12-24T10:55:13.762Z","dateReserved":"2025-12-24T10:53:15.517Z","dateUpdated":"2026-10-15T21:41:22.920Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-24 11:15:48","lastModifiedDate":"2026-10-15 22:17:32","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-15T21:32:05.442403Z","id":"CVE-2022-50697","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"50697","Ordinal":"1","Title":"mrp: introduce active flags to prevent UAF when applicant uninit","CVE":"CVE-2022-50697","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"50697","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"mrp: introduce active flags to prevent UAF when applicant uninit"}]}}}