CVE-2026-72389

CVE CVE-2026-72389EUVD EUVD-2026-59288Published 2026-08-15T05:56:18.000ZLast changed 2026-08-17T05:43:35.000ZCVSS 7.8

What the advisory describes

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

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.18.40; patch: 6.1.178; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <39283907a25e5caf0f2bd2947f6e56644b01e2b7; patch: 0; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40cbfa3a28e0919469d1b086629bb3ce38a83593; patch: 6.12.97; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b4b3458ef88df4798632619f018791d4344bcd92; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <297a747f59bff6573196d7236178144d66524e68; patch: 5.15.212; patch: 7.1.5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a00517db8de4be7df3d483b215c5544fb30a191; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c86579b0a2d201792bcb59316629f4ba4758cfc8; 2.6.12; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c40eec06eeac37c58e47a6058eb32901218d5d4; patch: 6.6.145; patch: 7.2

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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