IT

Tracker / CVE-2025-39736

CVE-2025-39736

Medium 5.5

In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock When netpoll is enabled, calling pr_warn_once() while holding kmemleak_lock in mem_pool_alloc() can cause a deadlock due to lock inversion with the netconsole subsystem. This occurs because pr_warn_once() may trigger netpoll, which eventually leads to __alloc_skb() and back into kmemleak code, attempting to reacquire kmemleak_lock. This is the path for the deadlock. mem_pool_alloc() -> raw_spin_lock_irqsave(&kmemleak_lock, flags); -> pr_warn_once() -> netconsole subsystem -> netpoll -> __alloc_skb -> __create_object -> raw_spin_lock_irqsave(&kmemleak_lock, flags); Fix this by setting a flag and issuing the pr_warn_once() after kmemleak_lock is released.

Affected products and versions

debian debian_linux
linux linux_kernel
linux linux_kernel · 5.11 → 5.15.190
linux linux_kernel · 5.16 → 6.1.149
linux linux_kernel · 5.4 → 5.4.297
linux linux_kernel · 5.5 → 5.10.241
linux linux_kernel · 6.13 → 6.15.11
linux linux_kernel · 6.16 → 6.16.2
linux linux_kernel · 6.2 → 6.6.103
linux linux_kernel · 6.7 → 6.12.43

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References