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nvd-json-data-feeds/CVE-2021/CVE-2021-472xx/CVE-2021-47237.json
cad-safe-bot 2c5db5e52b Auto-Update: 2024-12-30T21:00:20.105512+00:00
2024-12-30 21:03:44 +00:00

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{
"id": "CVE-2021-47237",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-05-21T15:15:12.930",
"lastModified": "2024-12-30T19:05:28.320",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hamradio: fix memory leak in mkiss_close\n\nMy local syzbot instance hit memory leak in\nmkiss_open()[1]. The problem was in missing\nfree_netdev() in mkiss_close().\n\nIn mkiss_open() netdevice is allocated and then\nregistered, but in mkiss_close() netdevice was\nonly unregistered, but not freed.\n\nFail log:\n\nBUG: memory leak\nunreferenced object 0xffff8880281ba000 (size 4096):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0.............\n 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .'.*............\n backtrace:\n [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0\n [<ffffffff8706e7e8>] alloc_netdev_mqs+0x98/0xe80\n [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]\n [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110\n [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670\n [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440\n [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200\n [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0\n [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff8880141a9a00 (size 96):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(....\n 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@..........\n backtrace:\n [<ffffffff8709f68b>] __hw_addr_create_ex+0x5b/0x310\n [<ffffffff8709fb38>] __hw_addr_add_ex+0x1f8/0x2b0\n [<ffffffff870a0c7b>] dev_addr_init+0x10b/0x1f0\n [<ffffffff8706e88b>] alloc_netdev_mqs+0x13b/0xe80\n [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]\n [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110\n [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670\n [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440\n [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200\n [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0\n [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff8880219bfc00 (size 512):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ff ...(............\n 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................\n backtrace:\n [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0\n [<ffffffff8706eec7>] alloc_netdev_mqs+0x777/0xe80\n [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]\n [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110\n [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670\n [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440\n [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200\n [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0\n [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nBUG: memory leak\nunreferenced object 0xffff888029b2b200 (size 256):\n comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (age 17.660s)\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace:\n [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0\n [<ffffffff8706f062>] alloc_netdev_mqs+0x912/0xe80\n [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]\n [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110\n [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670\n [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440\n [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200\n [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0\n [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae"
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: hamradio: corrige la p\u00e9rdida de memoria en mkiss_close. Mi instancia local de syzbot tuvo una p\u00e9rdida de memoria en mkiss_open()[1]. El problema estaba en que faltaba free_netdev() en mkiss_close(). En mkiss_open() el dispositivo de red se asigna y luego se registra, pero en mkiss_close() el dispositivo de red solo se anula del registro, pero no se libera. Registro de errores: ERROR: p\u00e9rdida de memoria, objeto sin referencia 0xffff8880281ba000 (tama\u00f1o 4096): comunicaci\u00f3n \"syz-executor.1\", pid 11443, santiam\u00e9n 4295046091 (edad 17,660 s) volcado hexadecimal (primeros 32 bytes): 61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00 ax0............. 00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00 .'.*....... .... seguimiento: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x98/0xe80 [] mkiss_open+0xb2/0x6f0 [] tty_ldisc_open+0x9b/0x110 [ ] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR : p\u00e9rdida de memoria objeto sin referencia 0xffff8880141a9a00 (tama\u00f1o 96): comm \"syz-executor.1\", pid 11443, jiffies 4295046091 (edad 17.660s) volcado hexadecimal (primeros 32 bytes): e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff ...(.......(.... 98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00 .....@....... .. seguimiento: [] __hw_addr_create_ex+0x5b/0x310 [] __hw_addr_add_ex+0x1f8/0x2b0 [] f0 [] alloc_netdev_mqs+0x13b/0xe80 [] mkiss_open +0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff8880219bfc00 (tama\u00f1o 512): comm \"syz-executor.1\", pid 11443, jiffies 95046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primeros 32 bytes): 00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ...(............ 80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x777/0xe80 [] mkiss_open+0xb2 /0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+0x3a/0xb0 [] Entry_SYSCALL_64_after_hwframe+0x44/0xae ERROR: p\u00e9rdida de memoria objeto sin referencia 0xffff888029b2b200 (tama\u00f1o 256): comm \"syz-executor.1\", pid 11443, jiffies 046091 (edad 17.660 a\u00f1os) volcado hexadecimal (primero 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ rastreo inverso: [] kvmalloc_node+0x61/0xf0 [] alloc_netdev_mqs+0x912/0xe80 [] mkiss_open+0xb2/0x6f0 [1] [] tty_ldisc_open+0x9b/0x110 [] tty_set_ldisc+0x2e8/0x670 [] tty_ioctl+0xda3/0x1440 [] __x64_sys_ioctl+0x193/0x200 [] do_syscall_64+ 0x3a/0xb0 [] entrada_SYSCALL_64_after_hwframe+0x44/0xae"
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "nvd@nist.gov",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "nvd@nist.gov",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-401"
}
]
}
],
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