CVE-2022-49779

{"id": "CVE-2022-49779", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2025-05-01T15:16:01.080", "references": [{"url": "https://git.kernel.org/stable/c/55788ebbe8b365b4375bd56b4ba7db79d393a370", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7b0007b28dd970176f2e297c06ae63eea2447127", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7d606ae1abcc3eab5408e42444d789dc7def51b8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c49cc2c059b503e962c2f13a806c105f9b757df4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case\n\nIn __unregister_kprobe_top(), if the currently unregistered probe has\npost_handler but other child probes of the aggrprobe do not have\npost_handler, the post_handler of the aggrprobe is cleared. If this is\na ftrace-based probe, there is a problem. In later calls to\ndisarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is\nNULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in\n__disarm_kprobe_ftrace() and may even cause use-after-free:\n\n Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)\n WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0\n Modules linked in: testKprobe_007(-)\n CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18\n [...]\n Call Trace:\n <TASK>\n __disable_kprobe+0xcd/0xe0\n __unregister_kprobe_top+0x12/0x150\n ? mutex_lock+0xe/0x30\n unregister_kprobes.part.23+0x31/0xa0\n unregister_kprobe+0x32/0x40\n __x64_sys_delete_module+0x15e/0x260\n ? do_user_addr_fault+0x2cd/0x6b0\n do_syscall_64+0x3a/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n\nFor the kprobe-on-ftrace case, we keep the post_handler setting to\nidentify this aggrprobe armed with kprobe_ipmodify_ops. This way we\ncan disarm it correctly."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kprobes: Omitir la limpieza del post_handler de aggrprobe en el caso de kprobe-on-ftrace. En __unregister_kprobe_top(), si la sonda actualmente no registrada tiene post_handler, pero otras sondas secundarias de aggrprobe no lo tienen, se limpia el post_handler de aggrprobe. Si se trata de una sonda basada en ftrace, existe un problema. En llamadas posteriores a disarm_kprobe(), usaremos kprobe_ftrace_ops porque post_handler es NULL. Pero estamos preparados con kprobe_ipmodify_ops. Esto activa una ADVERTENCIA en __disarm_kprobe_ftrace() e incluso puede provocar un use-after-free: No se pudo desarmar kprobe-ftrace en kernel_clone+0x0/0x3c0 (error -2) ADVERTENCIA: CPU: 5 PID: 137 en kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0 M\u00f3dulos vinculados en: testKprobe_007(-) CPU: 5 PID: 137 Comm: rmmod No contaminado 6.1.0-rc4-dirty #18 [...] Seguimiento de llamadas: __disable_kprobe+0xcd/0xe0 __unregister_kprobe_top+0x12/0x150 ? mutex_lock+0xe/0x30 unregister_kprobes.part.23+0x31/0xa0 unregister_kprobe+0x32/0x40 __x64_sys_delete_module+0x15e/0x260 ? do_user_addr_fault+0x2cd/0x6b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. De esta forma, podemos desactivarla correctamente."}], "lastModified": "2025-11-07T17:47:43.713", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "22272FA8-5DCC-4821-B920-45E23BB0DE78", "versionEndExcluding": "5.4.225", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2152F3D-E6D3-405D-B0BE-911B8B6E2EE6", "versionEndExcluding": "5.10.156", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "51BBEF3B-79F5-4D4C-ADBA-F34DA0E2465C", "versionEndExcluding": "5.15.80", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "64F9ADD1-3ADB-4D66-A00F-4A83010B05F0", "versionEndExcluding": "6.0.10", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "35B26BE4-43A6-4A36-A7F6-5B3F572D9186"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}