firewire: cdev: fix back-transition for iso_resource_auto client resource

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In the Linux kernel, the following vulnerability has been resolved: firewire: cdev: fix back-transition for iso_resource_auto client resource The todo member of iso_resource_auto structure represents the state of the client resource and normally transitions in the following order: ISO_RES_AUTO_ALLOC -> ISO_RES_AUTO_REALLOC -> ISO_RES_AUTO_DEALLOC However, concurrent access from the work item and the file descriptor release function can cause the state to transition backwards from ISO_RES_AUTO_DEALLOC to ISO_RES_AUTO_REALLOC. Prevent the back-transition by checking the current state before updating it in the work item.

Source published

18 Oct 2026 15:19:00 UTC

Source modified

19 Oct 2026 09:22:12 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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