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A vulnerability in the Linux kernel's genirq/irq_sim subsystem was resolved by properly initializing work context pointers using kzalloc() instead of kmalloc(), preventing invalid pointer dereferencing. This flaw could lead to system compromise due to improper memory initialization. The issue affects numerous Linux kernel versions prior to 6.14.0 and has a CVSS score of 7.8, indicating high impact on confidentiality, integrity, and availability. A patch is available and should be applied to mitigate the risk. The vendor advisory from Ubuntu confirms the fix and recommends updating to the specified patched kernel versions.

The Linux kernel vulnerability identified as CVE-2025-38408 involves improper initialization of the 'ops' member's pointers in the genirq/irq_sim subsystem. The kernel used kmalloc() for allocating the simulation work context, which does not zero-initialize memory, leading to random pointer content and potential invalid dereferencing. This flaw could be exploited to compromise system stability or security. The issue has been addressed by switching to kzalloc(), which zeroes allocated memory, ensuring proper initialization. The vulnerability affects a wide range of Linux kernel versions, with patches released in kernel version 6.14.0 and corresponding Ubuntu package updates. The CVSS 3.1 score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating a high severity local attack vector requiring low complexity and privileges, with high impact on confidentiality, integrity, and availability.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: genirq/irq_sim: Initialize work context pointers properly Initial

In the Linux kernel, the following vulnerability has been resolved: genirq/irq_sim: Initialize work context pointers properly Initialize ops… (CVE-2025-38408) - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: genirq/irq_sim: Initialize work context pointers properly Initialize ops… (CVE-2025-38408)

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