CVE-2022-50008

{"id": "CVE-2022-50008", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-06-18T11:15:28.737", "references": [{"url": "https://git.kernel.org/stable/c/19cd630712e7c13a3dedfc6986a9b983fed6fd98", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/55c7a91527343d2e0b5647cc308c6e04ddd2aa52", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6f3c1bc22fc2165461883f506b4d2c3594bd7137", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/744b0d3080709a172f0408aedabd1cedd24c2ee6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9c80e79906b4ca440d09e7f116609262bb747909", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b474ff1b20951f1eac75d100a93861e6da2b522b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bc3188d8a3b8c08c306a4c851ddb2c92ba4599ca", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fc91d2db55acdaf0c0075b624e572d3520ca3bc3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-835"}]}], "descriptions": [{"lang": "en", "value": "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<TASK>\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---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kprobes: no llamar a disarm_kprobe() para kprobes deshabilitados. La suposici\u00f3n en __disable_kprobe() es err\u00f3nea, y podr\u00eda intentar desarmar un kprobe ya desarmado y ejecutar el comando WARN_ONCE() a continuaci\u00f3n. [0] Podemos reproducir f\u00e1cilmente este problema. 1. Escriba 0 en /sys/kernel/debug/kprobes/enabled. # echo 0 &gt; /sys/kernel/debug/kprobes/enabled 2. Ejecute execsnoop. En este momento, un kprobe est\u00e1 deshabilitado. # /usr/share/bcc/tools/execsnoop &amp; [1] 2460 PCOMM PID PPID RET ARGS # cat /sys/kernel/debug/kprobes/list ffffffff91345650 r __x64_sys_execve+0x0 [FTRACE] ffffffff91345650 k __x64_sys_execve+0x0 [DISABLED][FTRACE] 3. Escriba 1 en /sys/kernel/debug/kprobes/enabled, lo cual cambia kprobes_all_disarmed a falso pero no arma el kprobe deshabilitado. # echo 1 &gt; /sys/kernel/debug/kprobes/enabled # cat /sys/kernel/debug/kprobes/list ffffffff91345650 r __x64_sys_execve+0x0 [FTRACE] ffffffff91345650 k __x64_sys_execve+0x0 [DESHABILITADO][FTRACE] 4. Matar execsnoop, cuando __disable_kprobe() llama a disarm_kprobe() para el kprobe deshabilitado y llega a WARN_ONCE() en __disarm_kprobe_ftrace(). # fg /usr/share/bcc/tools/execsnoop ^C En realidad, WARN_ONCE() se dispara dos veces, y __unregister_kprobe_top() pierde algunas limpiezas y deja el kprobe agregado en la tabla hash. Luego, __unregister_trace_kprobe() inicializa tk-&gt;rp.kp.list y crea un bucle infinito como este: addedd kprobe.list -&gt; kprobe.list -. ^ | '.__.' En esta situaci\u00f3n, estos comandos caen en el bucle infinito y provocan una parada o un bloqueo suave de la RCU. cat /sys/kernel/debug/kprobes/list : show_kprobe_addr() entra en el bucle infinito con la RCU. /usr/share/bcc/tools/execsnoop : warn_kprobe_rereg() contiene kprobe_mutex, y __get_valid_kprobe() queda atascado en el bucle. Para evitar este problema, aseg\u00farese de no llamar a disarm_kprobe() para las kprobes deshabilitadas. [0] No se pudo desarmar kprobe-ftrace en __x64_sys_execve+0x0/0x40 (error -2) ADVERTENCIA: CPU: 6 PID: 2460 en kernel/kprobes.c:1130 __disarm_kprobe_ftrace.isra.19 (kernel/kprobes.c:1129) M\u00f3dulos vinculados: ena CPU: 6 PID: 2460 Comm: execsnoop No contaminado 5.19.0+ #28 Nombre del hardware: Amazon EC2 c5.2xlarge/, BIOS 1.0 16/10/2017 RIP: 0010:__disarm_kprobe_ftrace.isra.19 (kernel/kprobes.c:1129) C\u00f3digo: 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 &lt;0f&gt; 0b 8b 04 24 eb b1 89 c6 48 c7 c7 60 fa 0f 92 89 04 24 e8 cc 94 RSP: 0018:ffff9e6ec154bd98 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffff930f7b00 RCX: 0000000000000001 RDX: 0000000080000001 RSI: ffffffff921461c5 RDI: 00000000ffffffff RBP: ffff89c504286da8 R08: 000000000000000 R09: c0000000fffeffff R10: 000000000000000 R11: ffff9e6ec154bc28 R12: ffff89c502394e40 R13: ffff89c502394c00 R14: ffff9e6ec154bc00 R15: 000000000000000 FS: 00007fe800398740(0000) GS:ffff89c812d80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00057f010 CR3: 0000000103b54006 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000000400 PKRU: 55555554 Seguimiento de llamadas: __disable_kprobe (kernel/kprobes.c:1716) disable_kprobe (kernel/kprobes.c:2392) __disable_trace_kprobe (kernel/trace/trace_kprobe.c:340) disable_trace_kprobe (kernel/trace/trace_kprobe.c:429) perf_trace_event_unreg.isra.2 (./include/linux/tracepoint.h:93 kernel/trace/trace_event_perf.c:168) perf_kprobe_destroy (kernel/trace/trace_event_perf.c:295) _free_event (kernel/events/core.c:4971) perf_event_release_kernel (kernel/events/core.c:5176) perf_release (kernel/events/core.c:5186) __fput (fs/file_table.c:321) task_work_run (./include/linux/---truncado---"}], "lastModified": "2025-11-14T16:59:09.023", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "203966D0-A354-4EC4-91F9-E064E3CF8F8D", "versionEndExcluding": "4.9.327", "versionStartIncluding": "4.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "42DF7D19-F259-47AF-8715-288480443B27", "versionEndExcluding": "4.14.292", "versionStartIncluding": "4.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "379F570B-8101-4252-AE1C-B802D441D9B4", "versionEndExcluding": "4.19.257", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BEFFBCD7-9B53-46AB-B3FD-53EAD80FD3E1", "versionEndExcluding": "5.4.212", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6872143E-BF6D-4DB5-8454-D843F608AB3B", "versionEndExcluding": "5.10.141", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81162A58-341F-455C-96D5-6DF30A0F9295", "versionEndExcluding": "5.15.65", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "89E99903-E16D-475D-954B-2BAC46C98262", "versionEndExcluding": "5.19.6", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}