{"id":"DEBIAN-CVE-2022-49014","details":"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:  \u003cTASK\u003e  __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.","modified":"2026-09-01T16:05:29.697219875Z","published":"2024-10-21T20:15:12.707Z","upstream":["CVE-2022-49014"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49014"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49014.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49014.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49014.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}