CVE-2026-72389High· 7.8▾ TwilightIn 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. They ar…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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. They are synchronously deactivated when the bridge is put administratively down and the various call sites check for 'IFF_UP' before arming them.
This check is missing from br_topology_change_detection() and it is possible to engineer a situation in which the topology change timer is armed while the bridge is administratively down, resulting in a use-after-free [1] when the bridge is deleted.
Fix by adding the missing check and for good measures synchronously shutdown the three timers when the bridge is deleted.
[1] ODEBUG: free active (active state 0) object: ffff88811662b9b0 object type: timer_list hint: br_topology_change_timer_expired (net/bridge/br_stp_timer.c:120) WARNING: lib/debugobjects.c:629 at debug_print_object+0x1bc/0x450, CPU#9: ip/359
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c86579b0a2d201792bcb59316629f4ba4758cfc8Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 297a747f59bff6573196d7236178144d66524e68Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4c40eec06eeac37c58e47a6058eb32901218d5d4Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 39283907a25e5caf0f2bd2947f6e56644b01e2b7Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b4b3458ef88df4798632619f018791d4344bcd92Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 40cbfa3a28e0919469d1b086629bb3ce38a83593Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2a00517db8de4be7df3d483b215c5544fb30a191Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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