nvd-json-data-feeds/CVE-2021/CVE-2021-472xx/CVE-2021-47238.json

{
  "id": "CVE-2021-47238",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-05-21T15:15:13.017",
  "lastModified": "2024-11-21T06:35:41.743",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv4: fix memory leak in ip_mc_add1_src\n\nBUG: memory leak\nunreferenced object 0xffff888101bc4c00 (size 32):\n  comm \"syz-executor527\", pid 360, jiffies 4294807421 (age 19.329s)\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n    01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................\n  backtrace:\n    [<00000000f17c5244>] kmalloc include/linux/slab.h:558 [inline]\n    [<00000000f17c5244>] kzalloc include/linux/slab.h:688 [inline]\n    [<00000000f17c5244>] ip_mc_add1_src net/ipv4/igmp.c:1971 [inline]\n    [<00000000f17c5244>] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095\n    [<000000001cb99709>] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416\n    [<0000000052cf19ed>] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [inline]\n    [<0000000052cf19ed>] ip_setsockopt+0x114b/0x30c0 net/ipv4/ip_sockglue.c:1423\n    [<00000000477edfbc>] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857\n    [<00000000e75ca9bb>] __sys_setsockopt+0x158/0x270 net/socket.c:2117\n    [<00000000bdb993a8>] __do_sys_setsockopt net/socket.c:2128 [inline]\n    [<00000000bdb993a8>] __se_sys_setsockopt net/socket.c:2125 [inline]\n    [<00000000bdb993a8>] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125\n    [<000000006a1ffdbd>] do_syscall_64+0x40/0x80 arch/x86/entry/common.c:47\n    [<00000000b11467c4>] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nIn commit 24803f38a5c0 (\"igmp: do not remove igmp souce list info when set\nlink down\"), the ip_mc_clear_src() in ip_mc_destroy_dev() was removed,\nbecause it was also called in igmpv3_clear_delrec().\n\nRough callgraph:\n\ninetdev_destroy\n-> ip_mc_destroy_dev\n     -> igmpv3_clear_delrec\n        -> ip_mc_clear_src\n-> RCU_INIT_POINTER(dev->ip_ptr, NULL)\n\nHowever, ip_mc_clear_src() called in igmpv3_clear_delrec() doesn't\nrelease in_dev->mc_list->sources. And RCU_INIT_POINTER() assigns the\nNULL to dev->ip_ptr. As a result, in_dev cannot be obtained through\ninetdev_by_index() and then in_dev->mc_list->sources cannot be released\nby ip_mc_del1_src() in the sock_close. Rough call sequence goes like:\n\nsock_close\n-> __sock_release\n   -> inet_release\n      -> ip_mc_drop_socket\n         -> inetdev_by_index\n         -> ip_mc_leave_src\n            -> ip_mc_del_src\n               -> ip_mc_del1_src\n\nSo we still need to call ip_mc_clear_src() in ip_mc_destroy_dev() to free\nin_dev->mc_list->sources."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ipv4: corrige la p\u00e9rdida de memoria en ip_mc_add1_src. BUG: p\u00e9rdida de memoria objeto sin referencia 0xffff888101bc4c00 (tama\u00f1o 32): comm \"syz-executor527\", pid 360, jiffies 4294807421 (edad 19.329s) volcado hexadecimal (primeros 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01 00 00 00 00 00 00 00 ac 14 14 bb 00 00 02 00 ................ backtrace: [&lt;00000000f17c5244&gt;] kmalloc include/linux/slab.h:558 [en l\u00ednea] [&lt;00000000f17c5244&gt;] kzalloc include/ linux/slab.h:688 [en l\u00ednea] [&lt;00000000f17c5244&gt;] ip_mc_add1_src net/ipv4/igmp.c:1971 [en l\u00ednea] [&lt;00000000f17c5244&gt;] ip_mc_add_src+0x95f/0xdb0 net/ipv4/igmp.c:2095 &lt;000000001cb99709 &gt;] ip_mc_source+0x84c/0xea0 net/ipv4/igmp.c:2416 [&lt;0000000052cf19ed&gt;] do_ip_setsockopt net/ipv4/ip_sockglue.c:1294 [en l\u00ednea] [&lt;0000000052cf19ed&gt;] 0net/ipv4/ip_sockglue. c:1423 [&lt;00000000477edfbc&gt;] raw_setsockopt+0x13d/0x170 net/ipv4/raw.c:857 [&lt;00000000e75ca9bb&gt;] __sys_setsockopt+0x158/0x270 net/socket.c:2117 [&lt;00000000bdb993 a8&gt;] __do_sys_setsockopt net/socket.c :2128 [en l\u00ednea] [&lt;00000000bdb993a8&gt;] __se_sys_setsockopt net/socket.c:2125 [en l\u00ednea] [&lt;00000000bdb993a8&gt;] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2125 [&lt;000000006a 1ffdbd&gt;] do_syscall_64+0x40/0x80 arch/ x86/entry/common.c:47 [&lt;00000000b11467c4&gt;] Entry_SYSCALL_64_after_hwframe+0x44/0xae En la confirmaci\u00f3n 24803f38a5c0 (\"igmp: no eliminar la informaci\u00f3n de la lista de fuentes de igmp cuando se establece el enlace\"), se elimin\u00f3 ip_mc_clear_src() en ip_mc_destroy_dev() , porque tambi\u00e9n fue llamado en igmpv3_clear_delrec(). Gr\u00e1fico de llamada aproximado: inetdev_destroy -&gt; ip_mc_destroy_dev -&gt; igmpv3_clear_delrec -&gt; ip_mc_clear_src -&gt; RCU_INIT_POINTER(dev-&gt;ip_ptr, NULL) Sin embargo, ip_mc_clear_src() llamado en igmpv3_clear_delrec() no libera in_dev-&gt;mc_list-&gt;sources. Y RCU_INIT_POINTER() asigna NULL a dev-&gt;ip_ptr. Como resultado, in_dev no se puede obtener a trav\u00e9s de inetdev_by_index() y luego in_dev-&gt;mc_list-&gt;sources no se puede liberar mediante ip_mc_del1_src() en sock_close. La secuencia de llamada aproximada es as\u00ed: sock_close -&gt; __sock_release -&gt; inet_release -&gt; ip_mc_drop_socket -&gt; inetdev_by_index -&gt; ip_mc_leave_src -&gt; ip_mc_del_src -&gt; ip_mc_del1_src Entonces todav\u00eda necesitamos llamar a ip_mc_clear_src() en ip_mc_destroy_dev() para liberar in_dev-&gt;mc_list -&gt;fuentes ."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0dc13e75507faa17ac9f7562b4ef7bf8fcd78422",
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