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CVE-2025-39826 In the Linux kernel, the following vulnerability has been resolved: net: rose: convert 'use' field to refcount_t The…

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.

Affected products and versions

Product Affected versions Fixed in
Linux 6.17 earliest → < 6.17 6.17
Linux 6.16 earliest → < 6.16.5 6.16.5
Linux 6.12 earliest → < 6.12.45 6.12.45
Linux 6.6 earliest → < 6.6.104 6.6.104
Linux 6.1 earliest → < 6.1.150 6.1.150
Linux 2.6.12 No fix stated
SIMATIC CN 4100 5.0 earliest → < 5.0 5.0
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.7 → latest No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 3.1.7 → latest No fix stated
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Product Affected versions Fixed in
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.7 → latest No fix stated

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