CVE-2025-39736 (GCVE-0-2025-39736)
Vulnerability from cvelistv5
Published
2025-09-11 16:52
Modified
2025-11-03 17:42
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
Version: c5665868183fec689dbab9fb8505188b2c4f0757
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    "cveId": "CVE-2025-39736",
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    "dateUpdated": "2025-11-03T17:42:52.536Z",
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  }
}


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