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A high severity use-after-free vulnerability (CVE-2025-38377) in the Linux kernel's rose network layer was identified and fixed. The flaw involves incorrect handling of neighbour pointers in the rose_rt_device_down() function, where loop index and count modifications cause some entries to be skipped, leaving dangling pointers that can be accessed later. This can lead to system compromise. The vulnerability affects many specific Linux kernel versions, primarily around 3.11.0 to 6.17.0 and various distribution-specific builds. A patch is available and included in recent Linux kernel updates. Users should update and reboot their systems to apply the fix. No known exploits in the wild have been reported.

CVE-2025-38377 is a use-after-free vulnerability in the Linux kernel's rose_rt_device_down() function. The issue arises because the loop bound 't->count' is modified during iteration, causing premature loop termination and missed entries. Additionally, when removing entries from the neighbour array, subsequent entries are shifted up, but the loop index increments regardless, skipping some entries. This results in dangling pointers to freed rose_neigh structures that may be accessed later, potentially leading to system compromise. The vulnerability affects numerous Linux kernel versions and has been addressed in official kernel updates. The Ubuntu security advisories USN-7774-1 and USN-7774-2 confirm the availability of patches and recommend updating to fixed kernel versions. No active exploitation has been observed.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: rose: fix dangling neighbour pointers in rose_rt_device_down() Th

In the Linux kernel, the following vulnerability has been resolved: rose: fix dangling neighbour pointers in rose_rt_device_down() There are two… (CVE-2025-38377) - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: rose: fix dangling neighbour pointers in rose_rt_device_down() There are two… (CVE-2025-38377)

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