Vulnerability-Lookup

CVE-2022-49014 (GCVE-0-2022-49014)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2026-08-05 08:53

Title

net: tun: Fix use-after-free in tun_detach()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: tun: Fix use-after-free in tun_detach() syzbot reported use-after-free in tun_detach() [1]. This causes call trace like below: ================================================================== BUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 Read of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673 CPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x461 mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] netdev_wait_allrefs_any net/core/dev.c:10237 [inline] netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351 tun_detach drivers/net/tun.c:704 [inline] tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xb3d/0x2a30 kernel/exit.c:820 do_group_exit+0xd4/0x2a0 kernel/exit.c:950 get_signal+0x21b1/0x2440 kernel/signal.c:2858 arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The cause of the issue is that sock_put() from __tun_detach() drops last reference count for struct net, and then notifier_call_chain() from netdev_state_change() accesses that struct net. This patch fixes the issue by calling sock_put() from tun_detach() after all necessary accesses for the struct net has done.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-22 13:13 UTC

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/1f23f1890d91812c3…
https://git.kernel.org/stable/c/16c244bc65d117577…
https://git.kernel.org/stable/c/5f442e1d403e0496b…
https://git.kernel.org/stable/c/04b995e9632295014…
https://git.kernel.org/stable/c/4cde8da2d814a3b7b…
https://git.kernel.org/stable/c/5daadc86f27ea4d69…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 83c1f36f9880814b24cdf6c2f91f66f61db65326 , < 1f23f1890d91812c35d32eab1b49621b6d32dc7b (git) Affected: 83c1f36f9880814b24cdf6c2f91f66f61db65326 , < 16c244bc65d1175775325ec0489a5a5c830e02c7 (git) Affected: 83c1f36f9880814b24cdf6c2f91f66f61db65326 , < 5f442e1d403e0496bacb74a58e2be7f500695e6f (git) Affected: 83c1f36f9880814b24cdf6c2f91f66f61db65326 , < 04b995e963229501401810dab89dc73e7f12d054 (git) Affected: 83c1f36f9880814b24cdf6c2f91f66f61db65326 , < 4cde8da2d814a3b7b176db81922d4ddaad7c0f0e (git) Affected: 83c1f36f9880814b24cdf6c2f91f66f61db65326 , < 5daadc86f27ea4d691e2131c04310d0418c6cd12 (git)	guessed
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 4.19.268 , ≤ 4.19.* (semver) Unaffected: 5.4.226 , ≤ 5.4.* (semver) Unaffected: 5.10.158 , ≤ 5.10.* (semver) Unaffected: 5.15.82 , ≤ 5.15.* (semver) Unaffected: 6.0.12 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)	guessed

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Fix use-after-free in tun_detach()\n\nsyzbot reported use-after-free in tun_detach() [1].  This causes call\ntrace like below:\n\n==================================================================\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\n\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x15e/0x461 mm/kasan/report.c:395\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\n tun_detach drivers/net/tun.c:704 [inline]\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\n __fput+0x27c/0xa90 fs/file_table.c:320\n task_work_run+0x16f/0x270 kernel/task_work.c:179\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that sock_put() from __tun_detach() drops\nlast reference count for struct net, and then notifier_call_chain()\nfrom netdev_state_change() accesses that struct net.\n\nThis patch fixes the issue by calling sock_put() from tun_detach()\nafter all necessary accesses for the struct net has done."
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: tun: Fix use-after-free in tun_detach()\\n\\nsyzbot reported use-after-free in tun_detach() [1].  This causes call\\ntrace like below:\\n\\n==================================================================\\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\\n\\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\\n print_address_description mm/kasan/report.c:284 [inline]\\n print_report+0x15e/0x461 mm/kasan/report.c:395\\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\\n tun_detach drivers/net/tun.c:704 [inline]\\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\\n __fput+0x27c/0xa90 fs/file_table.c:320\\n task_work_run+0x16f/0x270 kernel/task_work.c:179\\n exit_task_work include/linux/task_work.h:38 [inline]\\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nThe cause of the issue is that sock_put() from __tun_detach() drops\\nlast reference count for struct net, and then notifier_call_chain()\\nfrom netdev_state_change() accesses that struct net.\\n\\nThis patch fixes the issue by calling sock_put() from tun_detach()\\nafter all necessary accesses for the struct net has done.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: tun: Se corrige el use after free en tun_detach() syzbot inform\\u00f3 use after free en tun_detach() [1]. Esto provoca un seguimiento de llamadas como el siguiente: ==================================================================== ERROR: KASAN: use after free en notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 Lectura de tama\\u00f1o 8 en la direcci\\u00f3n ffff88807324e2a8 por la tarea syz-executor.0/3673 CPU: 0 PID: 3673 Comm: syz-executor.0 No contaminado 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 26/10/2022 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:88 [en l\\u00ednea] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [en l\\u00ednea] print_report+0x15e/0x461 mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942 call_netdevice_notifiers_extack net/core/dev.c:1983 [en l\\u00ednea] llamar_notificadores_dispositivos_de_red net/core/dev.c:1997 [en l\\u00ednea] netdev_wait_allrefs_any net/core/dev.c:10237 [en l\\u00ednea] netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351 tun_detach drivers/net/tun.c:704 [en l\\u00ednea] tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467 __fput+0x27c/0xa90 fs/file_table.c:320 tarea_trabajo_ejecutar+0x16f/0x270 kernel/tarea_trabajo.c:179 salir_tarea_trabajo incluir/linux/tarea_trabajo.h:38 [en l\\u00ednea] hacer_salir+0xb3d/0x2a30 kernel/exit.c:820 hacer_grupo_salir+0xd4/0x2a0 kernel/exit.c:950 obtener_se\\u00f1al+0x21b1/0x2440 kernel/se\\u00f1al.c:2858 arch_hacer_se\\u00f1al_o_reiniciar+0x86/0x2300 arch/x86/kernel/signal.c:869 bucle_salir_a_modo_usuario kernel/entry/common.c:168 [en l\\u00ednea] preparar_salir_a_modo_usuario+0x15f/0x250 kernel/entry/common.c:203 __syscall_salir_a_modo_usuario_trabajo kernel/entry/common.c:285 [en l\\u00ednea] syscall_salir_a_modo_usuario+0x1d/0x50 kernel/entry/common.c:296 La causa del problema es que sock_put() de __tun_detach() descarta el \\u00faltimo recuento de referencias para struct net y luego notifier_call_chain() de netdev_state_change() accede a ese struct net. Este parche corrige el problema llamando a sock_put() desde tun_detach() despu\\u00e9s de que se hayan realizado todos los accesos necesarios para struct net.\"}]",
      "id": "CVE-2022-49014",
      "lastModified": "2024-10-24T18:29:23.407",
      "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:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-10-21T20:15:12.707",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/1f23f1890d91812c35d32eab1b49621b6d32dc7b\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0e\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6f\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49014\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:12.707\",\"lastModified\":\"2026-08-04T10:17:30.860\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: tun: Fix use-after-free in tun_detach()\\n\\nsyzbot reported use-after-free in tun_detach() [1].  This causes call\\ntrace like below:\\n\\n==================================================================\\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\\n\\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\\n print_address_description mm/kasan/report.c:284 [inline]\\n print_report+0x15e/0x461 mm/kasan/report.c:395\\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\\n tun_detach drivers/net/tun.c:704 [inline]\\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\\n __fput+0x27c/0xa90 fs/file_table.c:320\\n task_work_run+0x16f/0x270 kernel/task_work.c:179\\n exit_task_work include/linux/task_work.h:38 [inline]\\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nThe cause of the issue is that sock_put() from __tun_detach() drops\\nlast reference count for struct net, and then notifier_call_chain()\\nfrom netdev_state_change() accesses that struct net.\\n\\nThis patch fixes the issue by calling sock_put() from tun_detach()\\nafter all necessary accesses for the struct net has done.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: tun: Se corrige el use after free en tun_detach() syzbot inform\u00f3 use after free en tun_detach() [1]. Esto provoca un seguimiento de llamadas como el siguiente: ==================================================================== ERROR: KASAN: use after free en notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff88807324e2a8 por la tarea syz-executor.0/3673 CPU: 0 PID: 3673 Comm: syz-executor.0 No contaminado 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 26/10/2022 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [en l\u00ednea] print_report+0x15e/0x461 mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942 call_netdevice_notifiers_extack net/core/dev.c:1983 [en l\u00ednea] llamar_notificadores_dispositivos_de_red net/core/dev.c:1997 [en l\u00ednea] netdev_wait_allrefs_any net/core/dev.c:10237 [en l\u00ednea] netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351 tun_detach drivers/net/tun.c:704 [en l\u00ednea] tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467 __fput+0x27c/0xa90 fs/file_table.c:320 tarea_trabajo_ejecutar+0x16f/0x270 kernel/tarea_trabajo.c:179 salir_tarea_trabajo incluir/linux/tarea_trabajo.h:38 [en l\u00ednea] hacer_salir+0xb3d/0x2a30 kernel/exit.c:820 hacer_grupo_salir+0xd4/0x2a0 kernel/exit.c:950 obtener_se\u00f1al+0x21b1/0x2440 kernel/se\u00f1al.c:2858 arch_hacer_se\u00f1al_o_reiniciar+0x86/0x2300 arch/x86/kernel/signal.c:869 bucle_salir_a_modo_usuario kernel/entry/common.c:168 [en l\u00ednea] preparar_salir_a_modo_usuario+0x15f/0x250 kernel/entry/common.c:203 __syscall_salir_a_modo_usuario_trabajo kernel/entry/common.c:285 [en l\u00ednea] syscall_salir_a_modo_usuario+0x1d/0x50 kernel/entry/common.c:296 La causa del problema es que sock_put() de __tun_detach() descarta el \u00faltimo recuento de referencias para struct net y luego notifier_call_chain() de netdev_state_change() accede a ese struct net. Este parche corrige el problema llamando a sock_put() desde tun_detach() despu\u00e9s de que se hayan realizado todos los accesos necesarios para struct net.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/tun.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"83c1f36f9880814b24cdf6c2f91f66f61db65326\",\"lessThan\":\"1f23f1890d91812c35d32eab1b49621b6d32dc7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83c1f36f9880814b24cdf6c2f91f66f61db65326\",\"lessThan\":\"16c244bc65d1175775325ec0489a5a5c830e02c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83c1f36f9880814b24cdf6c2f91f66f61db65326\",\"lessThan\":\"5f442e1d403e0496bacb74a58e2be7f500695e6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83c1f36f9880814b24cdf6c2f91f66f61db65326\",\"lessThan\":\"04b995e963229501401810dab89dc73e7f12d054\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83c1f36f9880814b24cdf6c2f91f66f61db65326\",\"lessThan\":\"4cde8da2d814a3b7b176db81922d4ddaad7c0f0e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"83c1f36f9880814b24cdf6c2f91f66f61db65326\",\"lessThan\":\"5daadc86f27ea4d691e2131c04310d0418c6cd12\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/tun.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.268\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.226\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.158\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.82\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.12\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"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:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-10-22T13:13:28.883740Z\",\"id\":\"CVE-2022-49014\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T18:17:39+00:00",
      "cve": "CVE-2022-49014",
      "id": "CVE-2022-49014",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: tun: Fix use-after-free in tun_detach()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49014.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-11T02:31:40Z",
      "cve": "CVE-2022-49014",
      "id": "CVE-2022-49014",
      "initial_release_date": "2024-10-22T14:22:15Z",
      "product_status:known_affected": "324",
      "product_status:known_not_affected": "269",
      "product_status:recommended": "607",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49014",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49014.json",
      "version": "64"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49014\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:13:28.883740Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:13:32.032Z\"}}], \"cna\": {\"title\": \"net: tun: Fix use-after-free in tun_detach()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is reached by opening /dev/net/tun, attaching via TUNSETIFF, then closing the fd (tun_chr_close \\u2192 tun_detach); this is a local char-dev/ioctl path, not remote packet processing.\\nAC:L - An attacker who creates a dedicated netns, attaches a non-persistent TUN, and exits deterministically drops the last struct net ref via sock_put while netdev_run_todo sleeps in netdev_wait_allrefs, so cleanup_net frees the net before notifier_call_chain runs; syzbot hit this repeatedly with no attacker-uncontrollable condition.\\nPR:L - Creating a TUN device requires only ns_capable(net-\u003euser_ns, CAP_NET_ADMIN), which an unprivileged user obtains via user+net namespaces (unshare -Urn); /dev/net/tun is world-accessible and syzbot reproduced via unshare/copy_net_ns.\\nUI:N - The attacker opens the TUN device, configures it, and exits entirely on their own; no victim action is required.\\nS:U - This is a standard in-kernel use-after-free enabling local privilege escalation within the same kernel security authority, with no VM escape or IOMMU/sandbox boundary crossing.\\nC:H - The UAF frees a ~6.7KB struct net slab object that is later read in notifier_call_chain via net-\u003enetdev_chain; reclaiming that object enables arbitrary kernel memory disclosure.\\nI:H - Reclaiming the freed net_namespace object lets an attacker control the notifier chain walked by notifier_call_chain, yielding function-pointer hijack and arbitrary write/code-execution primitives.\\nA:H - Any use-after-free is scored A:H; accessing the freed struct net during netdev unregister notifiers can oops/panic the kernel even without a full exploit.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"83c1f36f9880814b24cdf6c2f91f66f61db65326\", \"lessThan\": \"1f23f1890d91812c35d32eab1b49621b6d32dc7b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83c1f36f9880814b24cdf6c2f91f66f61db65326\", \"lessThan\": \"16c244bc65d1175775325ec0489a5a5c830e02c7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83c1f36f9880814b24cdf6c2f91f66f61db65326\", \"lessThan\": \"5f442e1d403e0496bacb74a58e2be7f500695e6f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83c1f36f9880814b24cdf6c2f91f66f61db65326\", \"lessThan\": \"04b995e963229501401810dab89dc73e7f12d054\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83c1f36f9880814b24cdf6c2f91f66f61db65326\", \"lessThan\": \"4cde8da2d814a3b7b176db81922d4ddaad7c0f0e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"83c1f36f9880814b24cdf6c2f91f66f61db65326\", \"lessThan\": \"5daadc86f27ea4d691e2131c04310d0418c6cd12\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/tun.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.268\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.226\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.158\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.82\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/tun.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1f23f1890d91812c35d32eab1b49621b6d32dc7b\"}, {\"url\": \"https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7\"}, {\"url\": \"https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6f\"}, {\"url\": \"https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054\"}, {\"url\": \"https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0e\"}, {\"url\": \"https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: tun: Fix use-after-free in tun_detach()\\n\\nsyzbot reported use-after-free in tun_detach() [1].  This causes call\\ntrace like below:\\n\\n==================================================================\\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\\n\\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\\n print_address_description mm/kasan/report.c:284 [inline]\\n print_report+0x15e/0x461 mm/kasan/report.c:395\\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\\n tun_detach drivers/net/tun.c:704 [inline]\\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\\n __fput+0x27c/0xa90 fs/file_table.c:320\\n task_work_run+0x16f/0x270 kernel/task_work.c:179\\n exit_task_work include/linux/task_work.h:38 [inline]\\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nThe cause of the issue is that sock_put() from __tun_detach() drops\\nlast reference count for struct net, and then notifier_call_chain()\\nfrom netdev_state_change() accesses that struct net.\\n\\nThis patch fixes the issue by calling sock_put() from tun_detach()\\nafter all necessary accesses for the struct net has done.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.268\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.226\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.158\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.82\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.12\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"4.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:53:25.973Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49014\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:53:25.973Z\", \"dateReserved\": \"2024-08-22T01:27:53.645Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:06:24.020Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2022-49014 (GCVE-0-2022-49014)

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