CVE-2025-38377
rose: fix dangling neighbour pointers in rose_rt_device_down()
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rose: fix dangling neighbour pointers in rose_rt_device_down()
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.
Reserved 2025-04-16 | Published 2025-07-25 | Updated 2025-07-25 | Assigner Linuxgit.kernel.org/...c/94e0918e39039c47ddceb609500817f7266be756
git.kernel.org/...c/fe62a35fb1f77f494ed534fc69a9043dc5a30ce1
git.kernel.org/...c/2b952dbb32fef835756f07ff0cd77efbb836dfea
git.kernel.org/...c/b6b232e16e08c6dc120672b4753392df0d28c1b4
git.kernel.org/...c/7a1841c9609377e989ec41c16551309ce79c39e4
git.kernel.org/...c/446ac00b86be1670838e513b643933d78837d8db
git.kernel.org/...c/2c6c82ee074bfcfd1bc978ec45bfea37703d840a
git.kernel.org/...c/34a500caf48c47d5171f4aa1f237da39b07c6157
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