Description
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.
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 < 94e0918e39039c47ddceb609500817f7266be756affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < fe62a35fb1f77f494ed534fc69a9043dc5a30ce1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2b952dbb32fef835756f07ff0cd77efbb836dfeaaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b6b232e16e08c6dc120672b4753392df0d28c1b4affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7a1841c9609377e989ec41c16551309ce79c39e4affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 446ac00b86be1670838e513b643933d78837d8dbaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 2c6c82ee074bfcfd1bc978ec45bfea37703d840aaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 34a500caf48c47d5171f4aa1f237da39b07c6157affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.4.296 to ≤ 5.4.*unaffected5.10.240 to ≤ 5.10.*unaffected5.15.187 to ≤ 5.15.*unaffected6.1.144 to ≤ 6.1.*unaffected6.6.97 to ≤ 6.6.*unaffected6.12.37 to ≤ 6.12.*unaffected6.15.6 to ≤ 6.15.*unaffected6.16 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/94e0918e39039c47ddceb609500817f7266be756 ↗
- https://git.kernel.org/stable/c/fe62a35fb1f77f494ed534fc69a9043dc5a30ce1 ↗
- https://git.kernel.org/stable/c/2b952dbb32fef835756f07ff0cd77efbb836dfea ↗
- https://git.kernel.org/stable/c/b6b232e16e08c6dc120672b4753392df0d28c1b4 ↗
- https://git.kernel.org/stable/c/7a1841c9609377e989ec41c16551309ce79c39e4 ↗
- https://git.kernel.org/stable/c/446ac00b86be1670838e513b643933d78837d8db ↗
- https://git.kernel.org/stable/c/2c6c82ee074bfcfd1bc978ec45bfea37703d840a ↗
- https://git.kernel.org/stable/c/34a500caf48c47d5171f4aa1f237da39b07c6157 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗