{"id":"DEBIAN-CVE-2024-36009","details":"In the Linux kernel, the following vulnerability has been resolved:  ax25: Fix netdev refcount issue  The dev_tracker is added to ax25_cb in ax25_bind(). When the ax25 device is detaching, the dev_tracker of ax25_cb should be deallocated in ax25_kill_by_device() instead of the dev_tracker of ax25_dev. The log reported by ref_tracker is shown below:  [   80.884935] ref_tracker: reference already released. [   80.885150] ref_tracker: allocated in: [   80.885349]  ax25_dev_device_up+0x105/0x540 [   80.885730]  ax25_device_event+0xa4/0x420 [   80.885730]  notifier_call_chain+0xc9/0x1e0 [   80.885730]  __dev_notify_flags+0x138/0x280 [   80.885730]  dev_change_flags+0xd7/0x180 [   80.885730]  dev_ifsioc+0x6a9/0xa30 [   80.885730]  dev_ioctl+0x4d8/0xd90 [   80.885730]  sock_do_ioctl+0x1c2/0x2d0 [   80.885730]  sock_ioctl+0x38b/0x4f0 [   80.885730]  __se_sys_ioctl+0xad/0xf0 [   80.885730]  do_syscall_64+0xc4/0x1b0 [   80.885730]  entry_SYSCALL_64_after_hwframe+0x67/0x6f [   80.885730] ref_tracker: freed in: [   80.885730]  ax25_device_event+0x272/0x420 [   80.885730]  notifier_call_chain+0xc9/0x1e0 [   80.885730]  dev_close_many+0x272/0x370 [   80.885730]  unregister_netdevice_many_notify+0x3b5/0x1180 [   80.885730]  unregister_netdev+0xcf/0x120 [   80.885730]  sixpack_close+0x11f/0x1b0 [   80.885730]  tty_ldisc_kill+0xcb/0x190 [   80.885730]  tty_ldisc_hangup+0x338/0x3d0 [   80.885730]  __tty_hangup+0x504/0x740 [   80.885730]  tty_release+0x46e/0xd80 [   80.885730]  __fput+0x37f/0x770 [   80.885730]  __x64_sys_close+0x7b/0xb0 [   80.885730]  do_syscall_64+0xc4/0x1b0 [   80.885730]  entry_SYSCALL_64_after_hwframe+0x67/0x6f [   80.893739] ------------[ cut here ]------------ [   80.894030] WARNING: CPU: 2 PID: 140 at lib/ref_tracker.c:255 ref_tracker_free+0x47b/0x6b0 [   80.894297] Modules linked in: [   80.894929] CPU: 2 PID: 140 Comm: ax25_conn_rel_6 Not tainted 6.9.0-rc4-g8cd26fd90c1a #11 [   80.895190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qem4 [   80.895514] RIP: 0010:ref_tracker_free+0x47b/0x6b0 [   80.895808] Code: 83 c5 18 4c 89 eb 48 c1 eb 03 8a 04 13 84 c0 0f 85 df 01 00 00 41 83 7d 00 00 75 4b 4c 89 ff 9 [   80.896171] RSP: 0018:ffff888009edf8c0 EFLAGS: 00000286 [   80.896339] RAX: 1ffff1100141ac00 RBX: 1ffff1100149463b RCX: dffffc0000000000 [   80.896502] RDX: 0000000000000001 RSI: 0000000000000246 RDI: ffff88800a0d6518 [   80.896925] RBP: ffff888009edf9b0 R08: ffff88806d3288d3 R09: 1ffff1100da6511a [   80.897212] R10: dffffc0000000000 R11: ffffed100da6511b R12: ffff88800a4a31d4 [   80.897859] R13: ffff88800a4a31d8 R14: dffffc0000000000 R15: ffff88800a0d6518 [   80.898279] FS:  00007fd88b7fe700(0000) GS:ffff88806d300000(0000) knlGS:0000000000000000 [   80.899436] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [   80.900181] CR2: 00007fd88c001d48 CR3: 000000000993e000 CR4: 00000000000006f0 ... [   80.935774] ref_tracker: sp%d@000000000bb9df3d has 1/1 users at [   80.935774]      ax25_bind+0x424/0x4e0 [   80.935774]      __sys_bind+0x1d9/0x270 [   80.935774]      __x64_sys_bind+0x75/0x80 [   80.935774]      do_syscall_64+0xc4/0x1b0 [   80.935774]      entry_SYSCALL_64_after_hwframe+0x67/0x6f  Change ax25_dev-\u003edev_tracker to the dev_tracker of ax25_cb in order to mitigate the bug.","modified":"2026-09-15T09:03:07.485699278Z","published":"2024-05-20T10:15:14.773Z","upstream":["CVE-2024-36009"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-36009"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.90-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36009.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.9-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36009.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.9-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36009.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:N/I:N/A:H"}]}