cve-2022-49014
Vulnerability from cvelistv5
Published
2024-10-21 20:06
Modified
2024-12-19 08:12
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f23f1890d91812c35d32eab1b49621b6d32dc7bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 83c1f36f9880814b24cdf6c2f91f66f61db65326
Version: 83c1f36f9880814b24cdf6c2f91f66f61db65326
Version: 83c1f36f9880814b24cdf6c2f91f66f61db65326
Version: 83c1f36f9880814b24cdf6c2f91f66f61db65326
Version: 83c1f36f9880814b24cdf6c2f91f66f61db65326
Version: 83c1f36f9880814b24cdf6c2f91f66f61db65326
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   Linux Linux Version: 4.17
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                "id": "CVE-2022-49014",
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                "timestamp": "2024-10-22T13:13:28.883740Z",
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          "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."
        }
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      "title": "net: tun: Fix use-after-free in tun_detach()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49014",
    "datePublished": "2024-10-21T20:06:24.020Z",
    "dateReserved": "2024-08-22T01:27:53.645Z",
    "dateUpdated": "2024-12-19T08:12:27.831Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49014\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:12.707\",\"lastModified\":\"2024-10-24T18:29:23.407\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.17\",\"versionEndExcluding\":\"4.19.268\",\"matchCriteriaId\":\"F418A145-8A14-43A0-823E-F1C684FB9825\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.226\",\"matchCriteriaId\":\"274F5087-5805-4D03-8C74-8517300658F1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.158\",\"matchCriteriaId\":\"D0FB1AF1-0A0B-4419-B25F-C61F17380E18\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.82\",\"matchCriteriaId\":\"0DC20DB6-73C1-4465-B931-117BFB8EBB02\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.0.12\",\"matchCriteriaId\":\"D6D56E90-F3EE-413D-B3E2-B518932F0C7D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7E331DA-1FB0-4DEC-91AC-7DA69D461C11\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"17F0B248-42CF-4AE6-A469-BB1BAE7F4705\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E2422816-0C14-4B5E-A1E6-A9D776E5C49B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"35B26BE4-43A6-4A36-A7F6-5B3F572D9186\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3FFFB0B3-930D-408A-91E2-BAE0C2715D80\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"8535320E-A0DB-4277-800E-D0CE5BBA59E8\"}]}]}],\"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\"]}]}}",
    "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()\", \"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-5f407fcff5a0\"}, \"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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:12:27.831Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49014\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:12:27.831Z\", \"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": "5.1"
    }
  }
}


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