CVE-2022-49970

{"id": "CVE-2022-49970", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "published": "2025-06-18T11:15:24.357", "references": [{"url": "https://git.kernel.org/stable/c/222bd95c89b135fde21f0bd0cb5cc1611c0c576c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7d6620f107bae6ed687ff07668e8e8f855487aa9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a1a05d3ae58299b040da4d5b27e72e81c2132e0b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c5f975e3ebfa57be13393c585a4b58ea707023cb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix kernel BUG in purge_effective_progs\n\nSyzkaller reported a triggered kernel BUG as follows:\n\n ------------[ cut here ]------------\n kernel BUG at kernel/bpf/cgroup.c:925!\n invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 1 PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0\n Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84\n 28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48\n 8b 0c5\n RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246\n RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000\n RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578\n RBP: 0000000000000000 R08: ffff888100ec0800 R09: 0000000000000040\n R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000\n R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00\n FS: 00007f68213d2b80(0000) GS:ffff88813bc80000(0000)\n knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0\n Call Trace:\n <TASK>\n cgroup_bpf_prog_detach+0xcc/0x100\n __sys_bpf+0x2273/0x2a00\n __x64_sys_bpf+0x17/0x20\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n RIP: 0033:0x7f68214dbcb9\n Code: 08 44 89 e0 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 48 89 f8 48 89\n f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01\n f0 ff8\n RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141\n RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9\n RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009\n RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003\n R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20\n R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0\n </TASK>\n Modules linked in:\n ---[ end trace 0000000000000000 ]---\n\nRepetition steps:\n\nFor the following cgroup tree,\n\n root\n |\n cg1\n |\n cg2\n\n 1. attach prog2 to cg2, and then attach prog1 to cg1, both bpf progs\n attach type is NONE or OVERRIDE.\n 2. write 1 to /proc/thread-self/fail-nth for failslab.\n 3. detach prog1 for cg1, and then kernel BUG occur.\n\nFailslab injection will cause kmalloc fail and fall back to\npurge_effective_progs. The problem is that cg2 have attached another prog,\nso when go through cg2 layer, iteration will add pos to 1, and subsequent\noperations will be skipped by the following condition, and cg will meet\nNULL in the end.\n\n `if (pos && !(cg->bpf.flags[atype] & BPF_F_ALLOW_MULTI))`\n\nThe NULL cg means no link or prog match, this is as expected, and it's not\na bug. So here just skip the no match situation."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, cgroup: Se corrige el error del kernel en purge_effective_progs Syzkaller inform\u00f3 un error del kernel activado de la siguiente manera: ------------[ cortar aqu\u00ed ]------------ \u00a1Error del kernel en kernel/bpf/cgroup.c:925! C\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 194 Comm: detach No contaminado 5.19.0-14184-g69dac8e431af #8 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0 C\u00f3digo: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84 28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 &lt;0f&gt; 0b 48 8b 0c5 RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246 RAX: 000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578 RBP: 000000000000000 R08: ffff888100ec0800 R09: 0000000000000040 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000 R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00 FS: 00007f68213d2b80(0000) GS:ffff88813bc80000(0000) knlGS:000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0 Rastreo de llamadas: cgroup_bpf_prog_detach+0xcc/0x100 __sys_bpf+0x2273/0x2a00 __x64_sys_bpf+0x17/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f68214dbcb9 C\u00f3digo: 08 44 89 e0 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 &lt;48&gt; 3d 01 f0 ff8 RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9 RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009 RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003 R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20 R13: 000000000000004 R14: 000000000000001 R15: 000055f74a1011b0 M\u00f3dulos vinculados en: ---[ fin del seguimiento 0000000000000000 ]--- Pasos de repetici\u00f3n: Para el siguiente \u00e1rbol de cgroup, root | cg1 | cg2: 1. Adjuntar prog2 a cg2 y, a continuaci\u00f3n, prog1 a cg1. El tipo de conexi\u00f3n de ambos programas bpf es NONE o OVERRIDE. 2. Escribir 1 en /proc/thread-self/fail-nth para failslab. 3. Desconectar prog1 de cg1 y, a continuaci\u00f3n, se produce un error en el n\u00facleo. La inyecci\u00f3n de failslab provocar\u00e1 un fallo en kmalloc y volver\u00e1 a purge_effective_progs. El problema radica en que cg2 ha adjuntado otro programa, por lo que, al pasar por la capa cg2, la iteraci\u00f3n a\u00f1adir\u00e1 pos a 1, y las operaciones posteriores se omitir\u00e1n por la siguiente condici\u00f3n, y cg cumplir\u00e1 con NULL al final. `if (pos &amp;&amp; !(cg-&gt;bpf.flags[atype] &amp; BPF_F_ALLOW_MULTI))` El cg NULL significa que no hay coincidencia de enlace o programa, esto es como se esperaba y no es un error. Por lo tanto, aqu\u00ed simplemente omita la situaci\u00f3n de no coincidencia."}], "lastModified": "2026-01-23T16:46:39.863", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "195808B1-F5C7-4E78-8707-2DEBC5F58D17", "versionEndExcluding": "5.10.142", "versionStartIncluding": "5.10.138"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7A949C3C-CF0E-4534-AACE-D99FED95FCAE", "versionEndExcluding": "5.15.66", "versionStartIncluding": "5.15.61"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B60CAFE2-08C3-461B-B5F8-25BEB0C9853E", "versionEndExcluding": "5.19", "versionStartIncluding": "5.18.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "00F39B21-9F82-4FE5-A788-FD1349833FBC", "versionEndExcluding": "5.19.8", "versionStartIncluding": "5.19.2"}, {"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"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A46498B3-78E1-4623-AAE1-94D29A42BE4E"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}