{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50008", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50008", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-06-18T11:01:13.331Z", "updatedAt": "2026-05-11T19:10:56.412Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "kprobes: don't call disarm_kprobe() for disabled kprobes", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: don't call disarm_kprobe() for disabled kprobes\n\nThe assumption in __disable_kprobe() is wrong, and it could try to disarm\nan already disarmed kprobe and fire the WARN_ONCE() below. [0] We can\neasily reproduce this issue.\n\n1. Write 0 to /sys/kernel/debug/kprobes/enabled.\n\n # echo 0 > /sys/kernel/debug/kprobes/enabled\n\n2. Run execsnoop. At this time, one kprobe is disabled.\n\n # /usr/share/bcc/tools/execsnoop &\n [1] 2460\n PCOMM PID PPID RET ARGS\n\n # cat /sys/kernel/debug/kprobes/list\n ffffffff91345650 r __x64_sys_execve+0x0 [FTRACE]\n ffffffff91345650 k __x64_sys_execve+0x0 [DISABLED][FTRACE]\n\n3. Write 1 to /sys/kernel/debug/kprobes/enabled, which changes\n kprobes_all_disarmed to false but does not arm the disabled kprobe.\n\n # echo 1 > /sys/kernel/debug/kprobes/enabled\n\n # cat /sys/kernel/debug/kprobes/list\n ffffffff91345650 r __x64_sys_execve+0x0 [FTRACE]\n ffffffff91345650 k __x64_sys_execve+0x0 [DISABLED][FTRACE]\n\n4. Kill execsnoop, when __disable_kprobe() calls disarm_kprobe() for the\n disabled kprobe and hits the WARN_ONCE() in __disarm_kprobe_ftrace().\n\n # fg\n /usr/share/bcc/tools/execsnoop\n ^C\n\nActually, WARN_ONCE() is fired twice, and __unregister_kprobe_top() misses\nsome cleanups and leaves the aggregated kprobe in the hash table. Then,\n__unregister_trace_kprobe() initialises tk->rp.kp.list and creates an\ninfinite loop like this.\n\n aggregated kprobe.list -> kprobe.list -.\n ^ |\n '.__.'\n\nIn this situation, these commands fall into the infinite loop and result\nin RCU stall or soft lockup.\n\n cat /sys/kernel/debug/kprobes/list : show_kprobe_addr() enters into the\n infinite loop with RCU.\n\n /usr/share/bcc/tools/execsnoop : warn_kprobe_rereg() holds kprobe_mutex,\n and __get_valid_kprobe() is stuck in\n\t\t\t\t the loop.\n\nTo avoid the issue, make sure we don't call disarm_kprobe() for disabled\nkprobes.\n\n[0]\nFailed to disarm kprobe-ftrace at __x64_sys_execve+0x0/0x40 (error -2)\nWARNING: CPU: 6 PID: 2460 at kernel/kprobes.c:1130 __disarm_kprobe_ftrace.isra.19 (kernel/kprobes.c:1129)\nModules linked in: ena\nCPU: 6 PID: 2460 Comm: execsnoop Not tainted 5.19.0+ #28\nHardware name: Amazon EC2 c5.2xlarge/, BIOS 1.0 10/16/2017\nRIP: 0010:__disarm_kprobe_ftrace.isra.19 (kernel/kprobes.c:1129)\nCode: 24 8b 02 eb c1 80 3d c4 83 f2 01 00 75 d4 48 8b 75 00 89 c2 48 c7 c7 90 fa 0f 92 89 04 24 c6 05 ab 83 01 e8 e4 94 f0 ff <0f> 0b 8b 04 24 eb b1 89 c6 48 c7 c7 60 fa 0f 92 89 04 24 e8 cc 94\nRSP: 0018:ffff9e6ec154bd98 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: ffffffff930f7b00 RCX: 0000000000000001\nRDX: 0000000080000001 RSI: ffffffff921461c5 RDI: 00000000ffffffff\nRBP: ffff89c504286da8 R08: 0000000000000000 R09: c0000000fffeffff\nR10: 0000000000000000 R11: ffff9e6ec154bc28 R12: ffff89c502394e40\nR13: ffff89c502394c00 R14: ffff9e6ec154bc00 R15: 0000000000000000\nFS: 00007fe800398740(0000) GS:ffff89c812d80000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000c00057f010 CR3: 0000000103b54006 CR4: 00000000007706e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n\n __disable_kprobe (kernel/kprobes.c:1716)\n disable_kprobe (kernel/kprobes.c:2392)\n __disable_trace_kprobe (kernel/trace/trace_kprobe.c:340)\n disable_trace_kprobe (kernel/trace/trace_kprobe.c:429)\n perf_trace_event_unreg.isra.2 (./include/linux/tracepoint.h:93 kernel/trace/trace_event_perf.c:168)\n perf_kprobe_destroy (kernel/trace/trace_event_perf.c:295)\n _free_event (kernel/events/core.c:4971)\n perf_event_release_kernel (kernel/events/core.c:5176)\n perf_release (kernel/events/core.c:5186)\n __fput (fs/file_table.c:321)\n task_work_run (./include/linux/\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "19cd630712e7c13a3dedfc6986a9b983fed6fd98" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "6f3c1bc22fc2165461883f506b4d2c3594bd7137" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "fc91d2db55acdaf0c0075b624e572d3520ca3bc3" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "b474ff1b20951f1eac75d100a93861e6da2b522b" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "744b0d3080709a172f0408aedabd1cedd24c2ee6" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "55c7a91527343d2e0b5647cc308c6e04ddd2aa52" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "bc3188d8a3b8c08c306a4c851ddb2c92ba4599ca" }, { "version": "69d54b916d83872a0a327778a01af2a096923f59", "status": "affected", "versionType": "git", "lessThan": "9c80e79906b4ca440d09e7f116609262bb747909" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.0" }, { "version": "4.9.327", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.292", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.257", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.212", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.141", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.65", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.19.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.19.*" }, { "version": "6.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }