{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50697","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-24T10:53:15.517Z","datePublished":"2025-12-24T10:55:13.762Z","dateUpdated":"2026-05-11T19:23:42.173Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:23:42.173Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/mrp.h","net/802/mrp.c"],"versions":[{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"98f53e591940e4c3818be358c5dc684d5b30cb56","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"78d48bc41f7726113c9f114268d3ab11212814da","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"aadb1507a77b060c529edfeaf67f803e31461f24","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"755eb0879224ffc2a43de724554aeaf0e51e5a64","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"5d5a481a7fd0234f617535dc464ea010804a1129","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"563e45fd5046045cc194af3ba17f5423e1c98170","status":"affected","versionType":"git"},{"version":"febf018d22347b5df94066bca05d0c11a84e839d","lessThan":"ab0377803dafc58f1e22296708c1c28e309414d6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/mrp.h","net/802/mrp.c"],"versions":[{"version":"3.9","status":"affected"},{"version":"0","lessThan":"3.9","status":"unaffected","versionType":"semver"},{"version":"4.9.337","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.303","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.270","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.229","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.163","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.86","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.0.16","lessThanOrEqual":"6.0.*","status":"unaffected","versionType":"semver"},{"version":"6.1.2","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"4.9.337"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"4.14.303"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"4.19.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.4.229"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.10.163"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.15.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.0.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.1.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.2"}]}]}],"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"}}}}