CVE-2025-38377

In the Linux kernel, the following vulnerability has been resolved:

rose: fix dangling neighbour pointers in rose_rt_device_down()

There are two bugs in rose_rt_device_down() that can cause use-after-free:

1. The loop bound t->count is modified within the loop, which can cause the loop to terminate early and miss some entries.

2. When removing an entry from the neighbour array, the subsequent entries are moved up to fill the gap, but the loop index i is still incremented, causing the next entry to be skipped.

For example, if a node has three neighbours (A, A, B) with count=3 and A is being removed, the second A is not checked.

i=0: (A, A, B) -> (A, B) with count=2
      ^ checked
i=1: (A, B)    -> (A, B) with count=2
         ^ checked (B, not A!)
i=2: (doesn't occur because i < count is false)

This leaves the second A in the array with count=2, but the rose_neigh structure has been freed. Code that accesses these entries assumes that the first count entries are valid pointers, causing a use-after-free when it accesses the dangling pointer.

Fix both issues by iterating over the array in reverse order with a fixed loop bound. This ensures that all entries are examined and that the removal of an entry doesn't affect subsequent iterations.

This vulnerability poses no security risk to Red Hat Enterprise Linux as the required ROSE amateur radio networking protocol is not enabled in supported kernel builds. The flaw involves a memory management issue occurring during interface teardown in configurations utilizing the amateur radio stack. Because the affected subsystem is omitted from supported kernels, Red Hat deployments are not exposed to this issue.