CVE-2025-39826
Description
In the Linux kernel, the following vulnerability has been resolved: net: rose: convert 'use' field to refcount_t The 'use' field in struct rose_neigh is used as a reference counter but lacks atomicity. This can lead to race conditions where a rose_neigh structure is freed while still being referenced by other code paths. For example, when rose_neigh->use becomes zero during an ioctl operation via rose_rt_ioctl(), the structure may be removed while its timer is still active, potentially causing use-after-free issues. This patch changes the type of 'use' from unsigned short to refcount_t and updates all code paths to use rose_neigh_hold() and rose_neigh_put() which operate reference counts atomically.
How to fix
- linux linux_kernel6.1.150, 6.6.104, 6.12.45, 6.16.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.12.1 ≤ v < 6.1.150, 6.2 ≤ v < 6.6.104, 6.7 ≤ v < 6.12.45, 6.13 ≤ v < 6.16.5, 2.6.12, 6.17 | 6.1.150, 6.6.104, 6.12.45, 6.16.5 |
| debian debian_linux | 11.0 | — |
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