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A use-after-free vulnerability in the Linux kernel's Appletalk protocol was identified and resolved. The flaw occurs in the AARP proxy-probe routine where a race condition between releasing and re-acquiring a lock allows an expire timer thread to free an entry that is still in use. This can lead to memory corruption. The vulnerability has a high severity score of 7.8 and affects many Linux kernel versions prior to 6.14.0-36.36 and related builds. A patch is available and included in updated Linux kernel packages. Users are advised to update and reboot to apply the fix.

The vulnerability (CVE-2025-38666) is a use-after-free in the Linux kernel's Appletalk network protocol, specifically in the AARP proxy-probe routine (aarp_proxy_probe_network). The routine sends a probe, releases the aarp_lock, sleeps, then re-acquires the lock. During this window, an expire timer thread (__aarp_expire_timer) can remove and free the same entry, causing a use-after-free condition due to a race between CPU threads. This flaw can lead to memory corruption and potentially compromise system integrity. The issue has been fixed in Linux kernel versions starting from 6.14.0-36.36 and equivalent patched versions. The vendor advisory from Ubuntu confirms the availability of patches and recommends updating to the specified fixed versions.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: net: appletalk: Fix use-after-free in AARP proxy probe The AARP p

In the Linux kernel, the following vulnerability has been resolved: net: appletalk: Fix use-after-free in AARP proxy probe The AARP proxy‐probe… (CVE-2025-38666) - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: net: appletalk: Fix use-after-free in AARP proxy probe The AARP proxy‐probe… (CVE-2025-38666)

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