{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-36009", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-36009", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-05-20T09:48:08.238Z", "updatedAt": "2026-08-05T11:31:33.867Z", "importedAt": "2026-10-24T01:57:11.582Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ax25: Fix netdev refcount issue", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: Fix netdev refcount issue\n\nThe dev_tracker is added to ax25_cb in ax25_bind(). When the\nax25 device is detaching, the dev_tracker of ax25_cb should be\ndeallocated in ax25_kill_by_device() instead of the dev_tracker\nof ax25_dev. The log reported by ref_tracker is shown below:\n\n[ 80.884935] ref_tracker: reference already released.\n[ 80.885150] ref_tracker: allocated in:\n[ 80.885349] ax25_dev_device_up+0x105/0x540\n[ 80.885730] ax25_device_event+0xa4/0x420\n[ 80.885730] notifier_call_chain+0xc9/0x1e0\n[ 80.885730] __dev_notify_flags+0x138/0x280\n[ 80.885730] dev_change_flags+0xd7/0x180\n[ 80.885730] dev_ifsioc+0x6a9/0xa30\n[ 80.885730] dev_ioctl+0x4d8/0xd90\n[ 80.885730] sock_do_ioctl+0x1c2/0x2d0\n[ 80.885730] sock_ioctl+0x38b/0x4f0\n[ 80.885730] __se_sys_ioctl+0xad/0xf0\n[ 80.885730] do_syscall_64+0xc4/0x1b0\n[ 80.885730] entry_SYSCALL_64_after_hwframe+0x67/0x6f\n[ 80.885730] ref_tracker: freed in:\n[ 80.885730] ax25_device_event+0x272/0x420\n[ 80.885730] notifier_call_chain+0xc9/0x1e0\n[ 80.885730] dev_close_many+0x272/0x370\n[ 80.885730] unregister_netdevice_many_notify+0x3b5/0x1180\n[ 80.885730] unregister_netdev+0xcf/0x120\n[ 80.885730] sixpack_close+0x11f/0x1b0\n[ 80.885730] tty_ldisc_kill+0xcb/0x190\n[ 80.885730] tty_ldisc_hangup+0x338/0x3d0\n[ 80.885730] __tty_hangup+0x504/0x740\n[ 80.885730] tty_release+0x46e/0xd80\n[ 80.885730] __fput+0x37f/0x770\n[ 80.885730] __x64_sys_close+0x7b/0xb0\n[ 80.885730] do_syscall_64+0xc4/0x1b0\n[ 80.885730] entry_SYSCALL_64_after_hwframe+0x67/0x6f\n[ 80.893739] ------------[ cut here ]------------\n[ 80.894030] WARNING: CPU: 2 PID: 140 at lib/ref_tracker.c:255 ref_tracker_free+0x47b/0x6b0\n[ 80.894297] Modules linked in:\n[ 80.894929] CPU: 2 PID: 140 Comm: ax25_conn_rel_6 Not tainted 6.9.0-rc4-g8cd26fd90c1a #11\n[ 80.895190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qem4\n[ 80.895514] RIP: 0010:ref_tracker_free+0x47b/0x6b0\n[ 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\n[ 80.896171] RSP: 0018:ffff888009edf8c0 EFLAGS: 00000286\n[ 80.896339] RAX: 1ffff1100141ac00 RBX: 1ffff1100149463b RCX: dffffc0000000000\n[ 80.896502] RDX: 0000000000000001 RSI: 0000000000000246 RDI: ffff88800a0d6518\n[ 80.896925] RBP: ffff888009edf9b0 R08: ffff88806d3288d3 R09: 1ffff1100da6511a\n[ 80.897212] R10: dffffc0000000000 R11: ffffed100da6511b R12: ffff88800a4a31d4\n[ 80.897859] R13: ffff88800a4a31d8 R14: dffffc0000000000 R15: ffff88800a0d6518\n[ 80.898279] FS: 00007fd88b7fe700(0000) GS:ffff88806d300000(0000) knlGS:0000000000000000\n[ 80.899436] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 80.900181] CR2: 00007fd88c001d48 CR3: 000000000993e000 CR4: 00000000000006f0\n...\n[ 80.935774] ref_tracker: sp%d@000000000bb9df3d has 1/1 users at\n[ 80.935774] ax25_bind+0x424/0x4e0\n[ 80.935774] __sys_bind+0x1d9/0x270\n[ 80.935774] __x64_sys_bind+0x75/0x80\n[ 80.935774] do_syscall_64+0xc4/0x1b0\n[ 80.935774] entry_SYSCALL_64_after_hwframe+0x67/0x6f\n\nChange ax25_dev->dev_tracker to the dev_tracker of ax25_cb\nin order to mitigate the bug.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "feef318c855a361a1eccd880f33e88c460eb63b4", "status": "affected", "versionType": "git", "lessThan": "0d14f104027e30720582448706c7d6b43065c851" }, { "version": "feef318c855a361a1eccd880f33e88c460eb63b4", "status": "affected", "versionType": "git", "lessThan": "4fee8fa86a15d7790268eea458b1aec69c695530" }, { "version": "feef318c855a361a1eccd880f33e88c460eb63b4", "status": "affected", "versionType": "git", "lessThan": "c42b073d9af4a5329b25b17390c63ab3847f30e8" }, { "version": "feef318c855a361a1eccd880f33e88c460eb63b4", "status": "affected", "versionType": "git", "lessThan": "467324bcfe1a31ec65d0cf4aa59421d6b7a7d52b" }, { "version": "b8c07f33aa35dacf5444e7053ed9662d1869f536", "status": "affected", "versionType": "git" }, { "version": "b1e0a6fc7f17500484c402ad1cd018c24dfc14b3", "status": "affected", "versionType": "git" }, { "version": "7528d0f2210c3a1154186175516ed37aa970f2b1", "status": "affected", "versionType": "git" }, { "version": "57cc15f5fd550316e4104eaf84b90fbc640fd7a5", "status": "affected", "versionType": "git" }, { "version": "b982492ec3a115e0a136856a1b2dbe32f2d21a0e", "status": "affected", "versionType": "git" }, { "version": "4.14.277", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.240", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.190", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.10.112", "status": "affected", "versionType": "semver", "lessThan": "5.11" }, { "version": "5.15.35", "status": "affected", "versionType": "semver", "lessThan": "5.16" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.17" }, { "version": "6.1.90", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.30", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.8.9", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.8.*" }, { "version": "6.9", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }