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

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2025-05-04 08:28
VLAI?
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
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    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)
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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\"}}}",
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