cve-2021-47451
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2024-11-04 12:06
Severity ?
Summary
netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a670c323055282c9b72794a491d53cef86bbeaf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

{
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                "id": "CVE-2021-47451",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-24T19:25:32.208577Z",
                "version": "2.0.3"
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        "title": "CISA ADP Vulnrichment"
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          "dateUpdated": "2024-08-04T05:39:59.385Z",
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/xt_IDLETIMER.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.7"
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              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value\n\nCurrently, when the rule related to IDLETIMER is added, idletimer_tg timer\nstructure is initialized by kmalloc on executing idletimer_tg_create\nfunction. However, in this process timer-\u003etimer_type is not defined to\na specific value. Thus, timer-\u003etimer_type has garbage value and it occurs\nkernel panic. So, this commit fixes the panic by initializing\ntimer-\u003etimer_type using kzalloc instead of kmalloc.\n\nTest commands:\n    # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test\n    $ cat /sys/class/xt_idletimer/timers/test\n      Killed\n\nSplat looks like:\n    BUG: KASAN: user-memory-access in alarm_expires_remaining+0x49/0x70\n    Read of size 8 at addr 0000002e8c7bc4c8 by task cat/917\n    CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e\n    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n    Call Trace:\n     dump_stack_lvl+0x6e/0x9c\n     kasan_report.cold+0x112/0x117\n     ? alarm_expires_remaining+0x49/0x70\n     __asan_load8+0x86/0xb0\n     alarm_expires_remaining+0x49/0x70\n     idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d]\n     dev_attr_show+0x3c/0x60\n     sysfs_kf_seq_show+0x11d/0x1f0\n     ? device_remove_bin_file+0x20/0x20\n     kernfs_seq_show+0xa4/0xb0\n     seq_read_iter+0x29c/0x750\n     kernfs_fop_read_iter+0x25a/0x2c0\n     ? __fsnotify_parent+0x3d1/0x570\n     ? iov_iter_init+0x70/0x90\n     new_sync_read+0x2a7/0x3d0\n     ? __x64_sys_llseek+0x230/0x230\n     ? rw_verify_area+0x81/0x150\n     vfs_read+0x17b/0x240\n     ksys_read+0xd9/0x180\n     ? vfs_write+0x460/0x460\n     ? do_syscall_64+0x16/0xc0\n     ? lockdep_hardirqs_on+0x79/0x120\n     __x64_sys_read+0x43/0x50\n     do_syscall_64+0x3b/0xc0\n     entry_SYSCALL_64_after_hwframe+0x44/0xae\n    RIP: 0033:0x7f0cdc819142\n    Code: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24\n    RSP: 002b:00007fff28eee5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\n    RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f0cdc819142\n    RDX: 0000000000020000 RSI: 00007f0cdc032000 RDI: 0000000000000003\n    RBP: 00007f0cdc032000 R08: 00007f0cdc031010 R09: 0000000000000000\n    R10: 0000000000000022 R11: 0000000000000246 R12: 00005607e9ee31f0\n    R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000"
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        "dateUpdated": "2024-11-04T12:06:11.022Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e"
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      "title": "netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47451",
    "datePublished": "2024-05-22T06:19:42.082Z",
    "dateReserved": "2024-05-21T14:58:30.832Z",
    "dateUpdated": "2024-11-04T12:06:11.022Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47451\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:10.220\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value\\n\\nCurrently, when the rule related to IDLETIMER is added, idletimer_tg timer\\nstructure is initialized by kmalloc on executing idletimer_tg_create\\nfunction. However, in this process timer-\u003etimer_type is not defined to\\na specific value. Thus, timer-\u003etimer_type has garbage value and it occurs\\nkernel panic. So, this commit fixes the panic by initializing\\ntimer-\u003etimer_type using kzalloc instead of kmalloc.\\n\\nTest commands:\\n    # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test\\n    $ cat /sys/class/xt_idletimer/timers/test\\n      Killed\\n\\nSplat looks like:\\n    BUG: KASAN: user-memory-access in alarm_expires_remaining+0x49/0x70\\n    Read of size 8 at addr 0000002e8c7bc4c8 by task cat/917\\n    CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e\\n    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\\n    Call Trace:\\n     dump_stack_lvl+0x6e/0x9c\\n     kasan_report.cold+0x112/0x117\\n     ? alarm_expires_remaining+0x49/0x70\\n     __asan_load8+0x86/0xb0\\n     alarm_expires_remaining+0x49/0x70\\n     idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d]\\n     dev_attr_show+0x3c/0x60\\n     sysfs_kf_seq_show+0x11d/0x1f0\\n     ? device_remove_bin_file+0x20/0x20\\n     kernfs_seq_show+0xa4/0xb0\\n     seq_read_iter+0x29c/0x750\\n     kernfs_fop_read_iter+0x25a/0x2c0\\n     ? __fsnotify_parent+0x3d1/0x570\\n     ? iov_iter_init+0x70/0x90\\n     new_sync_read+0x2a7/0x3d0\\n     ? __x64_sys_llseek+0x230/0x230\\n     ? rw_verify_area+0x81/0x150\\n     vfs_read+0x17b/0x240\\n     ksys_read+0xd9/0x180\\n     ? vfs_write+0x460/0x460\\n     ? do_syscall_64+0x16/0xc0\\n     ? lockdep_hardirqs_on+0x79/0x120\\n     __x64_sys_read+0x43/0x50\\n     do_syscall_64+0x3b/0xc0\\n     entry_SYSCALL_64_after_hwframe+0x44/0xae\\n    RIP: 0033:0x7f0cdc819142\\n    Code: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24\\n    RSP: 002b:00007fff28eee5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\\n    RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f0cdc819142\\n    RDX: 0000000000020000 RSI: 00007f0cdc032000 RDI: 0000000000000003\\n    RBP: 00007f0cdc032000 R08: 00007f0cdc031010 R09: 0000000000000000\\n    R10: 0000000000000022 R11: 0000000000000246 R12: 00005607e9ee31f0\\n    R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: xt_IDLETIMER: corrige el p\u00e1nico que ocurre cuando timer_type tiene valor basura Actualmente, cuando se agrega la regla relacionada con IDLETIMER, kmalloc inicializa la estructura del temporizador idletimer_tg al ejecutar la funci\u00f3n idletimer_tg_create. Sin embargo, en este proceso timer-\u0026gt;timer_type no est\u00e1 definido en un valor espec\u00edfico. Por lo tanto, timer-\u0026gt;timer_type tiene un valor basura y se produce un p\u00e1nico en el kernel. Entonces, esta confirmaci\u00f3n soluciona el p\u00e1nico al inicializar timer-\u0026gt;timer_type usando kzalloc en lugar de kmalloc. Comandos de prueba: # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test $ cat /sys/class/xt_idletimer/timers/test Killed Splat se ve as\u00ed: ERROR: KASAN: acceso a memoria de usuario en alarm_expires_remaining+0x49/ 0x70 Lectura del tama\u00f1o 8 en la direcci\u00f3n 0000002e8c7bc4c8 por tarea cat/917 CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 009), BIOS 1.13.0- 1ubuntu1.1 01/04/2014 Seguimiento de llamadas: dump_stack_lvl+0x6e/0x9c kasan_report.cold+0x112/0x117 ? alarm_expires_remaining+0x49/0x70 __asan_load8+0x86/0xb0 alarm_expires_remaining+0x49/0x70 idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d] tr_show+0x3c/0x60 sysfs_kf_seq_show+0x11d/0x1f0 ? device_remove_bin_file+0x20/0x20 kernfs_seq_show+0xa4/0xb0 seq_read_iter+0x29c/0x750 kernfs_fop_read_iter+0x25a/0x2c0 ? __fsnotify_parent+0x3d1/0x570? iov_iter_init+0x70/0x90 new_sync_read+0x2a7/0x3d0? __x64_sys_llseek+0x230/0x230 ? rw_verify_area+0x81/0x150 vfs_read+0x17b/0x240 ksys_read+0xd9/0x180 ? vfs_write+0x460/0x460? do_syscall_64+0x16/0xc0? lockdep_hardirqs_on+0x79/0x120 __x64_sys_read+0x43/0x50 do_syscall_64+0x3b/0xc0 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0cdc819142 C\u00f3digo: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 \u0026lt;48\u0026gt; 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24 RSP: :00007fff28eee5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000020000 RCX: 00007f0cdc819142 RDX: 0000000000020000 RSI: 00007f0cdc03200 0 RDI: 0000000000000003 RBP: 00007f0cdc032000 R08: 00007f0cdc031010 R09: 0000000000000000 R10: 0000000000000022 R11: 00000000000000246 R 12: 00005607e9ee31f0 R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2a670c323055282c9b72794a491d53cef86bbeaf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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