What’s Vulnerable › Vulnerabilities

CVE-2025-38095: dma-buf: insert memory barrier before updating num_fences

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-03 · updated 2026-10-15
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: dma-buf: insert memory barrier before updating num_fences smp_store_mb() inserts memory barrier after storing operation. It is different with what the comment is originally aiming so Null pointer dereference can be happened if memory update is reordered.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 5.0 before 5.10.241; from 5.11 before 5.15.192; from 5.16 before 6.1.140; from 6.2 before 6.6.92; from 6.7 before 6.12.30; from 6.13 before 6.14.8 — fixed in 5.10.241, 5.15.192, 6.1.140, 6.12.30, 6.14.8, 6.6.92

How to fix

Upgrade to a fixed version: Linux kernel 5.10.241, 5.15.192, 6.1.140, 6.12.30. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/08680c4dadc6e736c75bc2409d833f03f9003c51
• https://git.kernel.org/stable/c/3becc659f9cb76b481ad1fb71f54d5c8d6332d3f
• https://git.kernel.org/stable/c/72c7d62583ebce7baeb61acce6057c361f73be4a
• https://git.kernel.org/stable/c/90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f
• https://git.kernel.org/stable/c/c9d2b9a80d06a58f37e0dc8c827075639b443927
• https://git.kernel.org/stable/c/d0b7f11dd68b593bd970e5735be00e8d89bace30
• https://git.kernel.org/stable/c/fe1bebd0edb22e3536cbc920ec713331d1367ad4
• https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

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