cbcvebase.
CVE-2022-49014
published 2024-10-21

CVE-2022-49014: 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()…

PriorityP338high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.26%
18.1th percentile
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: __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, a

Affected

18 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.0.12-1 (bookworm)linux 6.0.12-1 (bookworm)
linuxlinux——
linuxlinux>= 83c1f36f9880814b24cdf6c2f91f66f61db65326 < 1f23f1890d91812c35d32eab1b49621b6d32dc7b1f23f1890d91812c35d32eab1b49621b6d32dc7b
linuxlinux>= 83c1f36f9880814b24cdf6c2f91f66f61db65326 < 16c244bc65d1175775325ec0489a5a5c830e02c716c244bc65d1175775325ec0489a5a5c830e02c7
linuxlinux>= 83c1f36f9880814b24cdf6c2f91f66f61db65326 < 5f442e1d403e0496bacb74a58e2be7f500695e6f5f442e1d403e0496bacb74a58e2be7f500695e6f
linuxlinux>= 83c1f36f9880814b24cdf6c2f91f66f61db65326 < 04b995e963229501401810dab89dc73e7f12d05404b995e963229501401810dab89dc73e7f12d054
linuxlinux>= 83c1f36f9880814b24cdf6c2f91f66f61db65326 < 4cde8da2d814a3b7b176db81922d4ddaad7c0f0e4cde8da2d814a3b7b176db81922d4ddaad7c0f0e
linuxlinux>= 83c1f36f9880814b24cdf6c2f91f66f61db65326 < 5daadc86f27ea4d691e2131c04310d0418c6cd125daadc86f27ea4d691e2131c04310d0418c6cd12
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.158-15.10.158-1
linuxlinux_kernel>= 0 < 6.0.12-16.0.12-1
linuxlinux_kernel>= 0 < 6.0.12-16.0.12-1
linuxlinux_kernel>= 0 < 6.0.12-16.0.12-1
linuxlinux_kernel>= 4.17 < 4.19.2684.19.268
linuxlinux_kernel>= 4.20 < 5.4.2265.4.226
linuxlinux_kernel>= 5.11 < 5.15.825.15.82
linuxlinux_kernel>= 5.16 < 6.0.126.0.12
linuxlinux_kernel>= 5.5 < 5.10.1585.10.158

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.