Description
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
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c86579b0a2d201792bcb59316629f4ba4758cfc8affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 297a747f59bff6573196d7236178144d66524e68affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4c40eec06eeac37c58e47a6058eb32901218d5d4affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 39283907a25e5caf0f2bd2947f6e56644b01e2b7affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b4b3458ef88df4798632619f018791d4344bcd92affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 40cbfa3a28e0919469d1b086629bb3ce38a83593affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2a00517db8de4be7df3d483b215c5544fb30a191affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c86579b0a2d201792bcb59316629f4ba4758cfc8 ↗
- https://git.kernel.org/stable/c/297a747f59bff6573196d7236178144d66524e68 ↗
- https://git.kernel.org/stable/c/4c40eec06eeac37c58e47a6058eb32901218d5d4 ↗
- https://git.kernel.org/stable/c/39283907a25e5caf0f2bd2947f6e56644b01e2b7 ↗
- https://git.kernel.org/stable/c/b4b3458ef88df4798632619f018791d4344bcd92 ↗
- https://git.kernel.org/stable/c/40cbfa3a28e0919469d1b086629bb3ce38a83593 ↗
- https://git.kernel.org/stable/c/2a00517db8de4be7df3d483b215c5544fb30a191 ↗