CVE-2024-46785

{"id": "CVE-2024-46785", "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": "2024-09-18T08:15:05.730", "references": [{"url": "https://git.kernel.org/stable/c/05e08297c3c298d8ec28e5a5adb55840312dd87e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d2603279c7d645bf0d11fa253b23f1ab48fc8d3c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f579d17a86448779f9642ad8baca6e3036a8e2d6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Use list_del_rcu() for SRCU protected list variable\n\nChi Zhiling reported:\n\n We found a null pointer accessing in tracefs[1], the reason is that the\n variable 'ei_child' is set to LIST_POISON1, that means the list was\n removed in eventfs_remove_rec. so when access the ei_child->is_freed, the\n panic triggered.\n\n by the way, the following script can reproduce this panic\n\n loop1 (){\n while true\n do\n echo \"p:kp submit_bio\" > /sys/kernel/debug/tracing/kprobe_events\n echo \"\" > /sys/kernel/debug/tracing/kprobe_events\n done\n }\n loop2 (){\n while true\n do\n tree /sys/kernel/debug/tracing/events/kprobes/\n done\n }\n loop1 &\n loop2\n\n [1]:\n [ 1147.959632][T17331] Unable to handle kernel paging request at virtual address dead000000000150\n [ 1147.968239][T17331] Mem abort info:\n [ 1147.971739][T17331] ESR = 0x0000000096000004\n [ 1147.976172][T17331] EC = 0x25: DABT (current EL), IL = 32 bits\n [ 1147.982171][T17331] SET = 0, FnV = 0\n [ 1147.985906][T17331] EA = 0, S1PTW = 0\n [ 1147.989734][T17331] FSC = 0x04: level 0 translation fault\n [ 1147.995292][T17331] Data abort info:\n [ 1147.998858][T17331] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n [ 1148.005023][T17331] CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n [ 1148.010759][T17331] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n [ 1148.016752][T17331] [dead000000000150] address between user and kernel address ranges\n [ 1148.024571][T17331] Internal error: Oops: 0000000096000004 [#1] SMP\n [ 1148.030825][T17331] Modules linked in: team_mode_loadbalance team nlmon act_gact cls_flower sch_ingress bonding tls macvlan dummy ib_core bridge stp llc veth amdgpu amdxcp mfd_core gpu_sched drm_exec drm_buddy radeon crct10dif_ce video drm_suballoc_helper ghash_ce drm_ttm_helper sha2_ce ttm sha256_arm64 i2c_algo_bit sha1_ce sbsa_gwdt cp210x drm_display_helper cec sr_mod cdrom drm_kms_helper binfmt_misc sg loop fuse drm dm_mod nfnetlink ip_tables autofs4 [last unloaded: tls]\n [ 1148.072808][T17331] CPU: 3 PID: 17331 Comm: ls Tainted: G W ------- ---- 6.6.43 #2\n [ 1148.081751][T17331] Source Version: 21b3b386e948bedd29369af66f3e98ab01b1c650\n [ 1148.088783][T17331] Hardware name: Greatwall GW-001M1A-FTF/GW-001M1A-FTF, BIOS KunLun BIOS V4.0 07/16/2020\n [ 1148.098419][T17331] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n [ 1148.106060][T17331] pc : eventfs_iterate+0x2c0/0x398\n [ 1148.111017][T17331] lr : eventfs_iterate+0x2fc/0x398\n [ 1148.115969][T17331] sp : ffff80008d56bbd0\n [ 1148.119964][T17331] x29: ffff80008d56bbf0 x28: ffff001ff5be2600 x27: 0000000000000000\n [ 1148.127781][T17331] x26: ffff001ff52ca4e0 x25: 0000000000009977 x24: dead000000000100\n [ 1148.135598][T17331] x23: 0000000000000000 x22: 000000000000000b x21: ffff800082645f10\n [ 1148.143415][T17331] x20: ffff001fddf87c70 x19: ffff80008d56bc90 x18: 0000000000000000\n [ 1148.151231][T17331] x17: 0000000000000000 x16: 0000000000000000 x15: ffff001ff52ca4e0\n [ 1148.159048][T17331] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n [ 1148.166864][T17331] x11: 0000000000000000 x10: 0000000000000000 x9 : ffff8000804391d0\n [ 1148.174680][T17331] x8 : 0000000180000000 x7 : 0000000000000018 x6 : 0000aaab04b92862\n [ 1148.182498][T17331] x5 : 0000aaab04b92862 x4 : 0000000080000000 x3 : 0000000000000068\n [ 1148.190314][T17331] x2 : 000000000000000f x1 : 0000000000007ea8 x0 : 0000000000000001\n [ 1148.198131][T17331] Call trace:\n [ 1148.201259][T17331] eventfs_iterate+0x2c0/0x398\n [ 1148.205864][T17331] iterate_dir+0x98/0x188\n [ 1148.210036][T17331] __arm64_sys_getdents64+0x78/0x160\n [ 1148.215161][T17331] invoke_syscall+0x78/0x108\n [ 1148.219593][T17331] el0_svc_common.constprop.0+0x48/0xf0\n [ 1148.224977][T17331] do_el0_svc+0x24/0x38\n [ 1148.228974][T17331] el0_svc+0x40/0x168\n [ 1148.232798][T17\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: eventfs: Uso list_del_rcu() para la variable de lista protegida SRCU Chi Zhiling inform\u00f3: Encontramos un puntero nulo accediendo en tracefs[1], la raz\u00f3n es que la variable 'ei_child' est\u00e1 configurada en LIST_POISON1, lo que significa que la lista se elimin\u00f3 en eventfs_remove_rec. entonces, cuando se accede a ei_child->is_freed, se activa el p\u00e1nico. por cierto, el siguiente script puede reproducir este bucle de p\u00e1nico loop1 (){ while true do echo \"p:kp submission_bio\" > /sys/kernel/debug/tracing/kprobe_events echo \"\" > /sys/kernel/debug/tracing/kprobe_events done } loop2 (){ while true do tree /sys/kernel/debug/tracing/events/kprobes/ done } loop1 & loop2 [1]: [ 1147.959632][T17331] No se puede manejar la solicitud de paginaci\u00f3n del n\u00facleo en la direcci\u00f3n virtual dead000000000150 [ 1147.968239][T17331] Informaci\u00f3n de aborto de memoria: [ 1147.971739][T17331] ESR = 0x0000000096000004 [ 1147.976172][T17331] EC = 0x25: DABT (EL actual), IL = 32 bits [ 1147.982171][T17331] SET = 0, FnV = 0 [ 1147.985906][T17331] EA = 0, S1PTW = 0 [ 1147.989734][T17331] FSC = 0x04: error de traducci\u00f3n de nivel 0 [ 1147.995292][T17331] Informaci\u00f3n de cancelaci\u00f3n de datos: [ 1147.998858][T17331] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 1148.005023][T17331] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 1148.010759][T17331] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 1148.016752][T17331] [dead000000000150] direcci\u00f3n entre los rangos de direcciones del usuario y del n\u00facleo [ 1148.024571][T17331] Error interno: Oops: 0000000096000004 [#1] SMP [ 1148.030825][T17331] M\u00f3dulos vinculados en: team_mode_loadbalance team nlmon act_gact cls_flower sch_ingress bonding tls puente ib_core de macvlan dummy stp llc veth amdgpu amdxcp mfd_core gpu_sched drm_exec drm_buddy radeon crct10dif_ce video drm_suballoc_helper ghash_ce drm_ttm_helper sha2_ce ttm sha256_arm64 i2c_algo_bit sha1_ce sbsa_gwdt cp210x drm_display_helper cec sr_mod cdrom drm_kms_helper binfmt_misc sg loop fuse drm dm_mod nfnetlink ip_tables autofs4 [\u00faltima descarga: tls] [ 1148.072808][T17331] CPU: 3 PID: 17331 Comm: ls Contaminado: GW ------- ---- 6.6.43 #2 [ 1148.081751][T17331] Versi\u00f3n de origen: 21b3b386e948bedd29369af66f3e98ab01b1c650 [ 1148.088783][T17331] Nombre del hardware: Greatwall GW-001M1A-FTF/GW-001M1A-FTF, BIOS KunLun BIOS V4.0 16/07/2020 [ 1148.098419][T17331] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 1148.106060][T17331] pc : eventfs_iterate+0x2c0/0x398 [ 1148.111017][T17331] lr : eventfs_iterate+0x2fc/0x398 [ 1148.115969][T17331] sp : ffff80008d56bbd0 [ 1148.119964][T17331] x29: ffff80008d56bbf0 x28: ffff001ff5be2600 x27: 0000000000000000 [ 1148.127781][T17331] x26: ffff001ff52ca4e0 x25: 0000000000009977 x24: muerto000000000100 [ 1148.135598][T17331] x23: 0000000000000000 x22: 0000000000000000b x21: ffff800082645f10 [ 1148.143415][T17331] x20: ffff001fddf87c70 x19: ffff80008d56bc90 x18: 000000000000000 [ 1148.151231][T17331] x17: 000000000000000 x16: 0000000000000000 x15: ffff001ff52ca4e0 [ 1148.159048][T17331] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 1148.166864][T17331] x11: 000000000000000 x10: 000000000000000 x9 : ffff8000804391d0 [ 1148.174680][T17331] x8 : 000000018000000 x7 : 0000000000000018 x6 : 0000aaab04b92862 [ 1148.182498][T17331] x5 : 0000aaab04b92862 x4 : 0000000080000000 x3 : 0000000000000068 [ 1148.190314][T17331] x2 : 00000000000000f x1 : 0000000000007ea8 x0 : 0000000000000001 [ 1148.198131][T17331] Rastreo de llamadas: [ 1148.201259][T17331] eventfs_iterate+0x2c0/0x398 [ 1148.205864][T17331] iterar_dir+0x98/0x188 [ 1148.210036][T17331] __arm64_sys_getdents64+0x78/0x160 [ 1148.215161][T17331] invocar_llamada_al_sistema+0x78/0x108 [ 1148.219593][T17331] el0_svc_common.constprop.0+0x48/0xf0 [ 1148.224977][T17331] hacer_el0_svc+0x24/0x38 [ 1148.228974][T17331] el0_svc+0x40/0x168 [ 1148.232798][T17 ---truncado---"}], "lastModified": "2024-11-20T15:51:33.027", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7476B2E8-446E-44CC-913C-1FB416620536", "versionEndExcluding": "6.6.51", "versionStartIncluding": "6.6.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9048C5C2-5073-4D52-BC14-154912BA5D82", "versionEndExcluding": "6.8", "versionStartIncluding": "6.7.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4FAFFECB-D55B-4130-801C-AE52B8A6B1BA", "versionEndExcluding": "6.10.10", "versionStartIncluding": "6.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "39889A68-6D34-47A6-82FC-CD0BF23D6754"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8383ABF-1457-401F-9B61-EE50F4C61F4F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B77A9280-37E6-49AD-B559-5B23A3B1DC3D"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}