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A vulnerability in the Linux kernel's dma-buf subsystem related to memory barrier insertion before updating num_fences has been resolved. The issue could cause a null pointer dereference due to memory update reordering. This vulnerability is part of a broader set of security issues fixed in the Linux kernel affecting multiple subsystems and architectures. The vulnerability has a CVSS 3.1 score of 7.8, indicating high impact on confidentiality, integrity, and availability. A patch is available and included in Linux kernel versions 6.14.0 and later for various Ubuntu releases. Users are advised to update and reboot their systems to apply the fixes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary.

CVE-2025-38095 addresses a flaw in the Linux kernel's dma-buf subsystem where the memory barrier (smp_store_mb()) was inserted after storing the num_fences value, contrary to the intended behavior described in the code comments. This discrepancy could lead to memory update reordering, resulting in a null pointer dereference. The vulnerability is one of several fixed in the Linux kernel affecting various architectures (ARM64, RISC-V, x86) and subsystems including DMA engine, GPU drivers, network drivers, and more. The issue has been patched in Linux kernel version 6.14.0 and corresponding Ubuntu kernel packages. The CVSS 3.1 vector indicates local attack vector, low complexity, low privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.

Detailed information about Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: dma-buf: insert memory barrier before updating nu

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: dma-buf: insert memory barrier before updating num_fences smp_store_mb() inserts… (CVE-2025-38095) - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: dma-buf: insert memory barrier before updating num_fences smp_store_mb() inserts… (CVE-2025-38095)

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