{"id":"CVE-2026-72389","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-72389","generatedAt":"2026-10-28T04:33:51.338Z","title":"In the Linux kernel, the following vulnerability has been resolved: bridge: stp: Fix a potential use-after-free when deleting a bridge The three STP timers are not supposed to be armed while the bridge is administratively down.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbridge: stp: Fix a potential use-after-free when deleting a bridge\n\nThe three STP timers are not supposed to be armed while the bridge is\nadministratively down. They are synchronously deactivated when the\nbridge is put administratively down and the various call sites check for\n'IFF_UP' before arming them.\n\nThis check is missing from br_topology_change_detection() and it is\npossible to engineer a situation in which the topology change timer is\narmed while the bridge is administratively down, resulting in a\nuse-after-free [1] when the bridge is deleted.\n\nFix by adding the missing check and for good measures synchronously\nshutdown the three timers when the bridge is deleted.\n\n[1]\nODEBUG: free active (active state 0) object: ffff88811662b9b0 object type: timer_list hint: br_topology_change_timer_expired (net/bridge/br_stp_timer.c:120)\nWARNING: lib/debugobjects.c:629 at debug_print_object+0x1bc/0x450, CPU#9: ip/359","published":"2026-08-15T06:22:12.000Z","lastModified":"2026-10-16T19:17:27.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":[],"epss":{"score":0.00164,"percentile":0.05552,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/297a747f59bff6573196d7236178144d66524e68","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2a00517db8de4be7df3d483b215c5544fb30a191","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/39283907a25e5caf0f2bd2947f6e56644b01e2b7","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/40cbfa3a28e0919469d1b086629bb3ce38a83593","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4c40eec06eeac37c58e47a6058eb32901218d5d4","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b4b3458ef88df4798632619f018791d4344bcd92","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c86579b0a2d201792bcb59316629f4ba4758cfc8","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72389","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}