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CVE-2025-39843 is a lock-recursion vulnerability in the Linux kernel's SLUB memory allocator. With CONFIG_DEBUG_OBJECTS_TIMERS enabled, hrtimer_start_range_ns() can reach set_track_prepare() through debug-object pool allocation while holding a per-CPU hrtimer base lock. Stack-depot allocation can implicitly wake kswapd, causing the execution path to attempt to acquire the same lock again. This can produce spinlock recursion and a kernel deadlock, resulting in denial of service.
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A Linux kernel SLUB memory-allocation flaw can cause spinlock recursion and deadlock when timer debugging is enabled. Implicitly waking kswapd during set_track_prepare() can attempt to reacquire an already-held timer lock, affecting availability. The reference assigns a CVSS v3 base score of 5.5 and recommends updating the affected Google COS kernel packages to version 19216.0.53 or later.
A Linux kernel SLUB memory-allocation flaw can cause spinlock recursion and deadlock when CONFIG_DEBUG_OBJECTS_TIMERS is enabled. Allocation in set_track_prepare() can wake kswapd while a high-resolution timer lock is already held, leading to an attempt to reacquire that lock. The advisory rates the vulnerability CVSS v3 5.5, with local access, low privileges, and high availability impact.
A Linux kernel vulnerability in the memory management SLUB area related to set_track_prepare().
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.