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
linux: linux kernel; debian: debian linux
References9
- git.kernel.org/stable/c/08680c4dadc6e736c75bc2409d833f03f9003c51 Patch
- git.kernel.org/stable/c/3becc659f9cb76b481ad1fb71f54d5c8d6332d3f Patch
- git.kernel.org/stable/c/72c7d62583ebce7baeb61acce6057c361f73be4a Patch
- git.kernel.org/stable/c/90eb79c4ed98a4e24a62ccf61c199ab0f680fa8f Patch
- git.kernel.org/stable/c/c9d2b9a80d06a58f37e0dc8c827075639b443927 Patch
- git.kernel.org/stable/c/d0b7f11dd68b593bd970e5735be00e8d89bace30 Patch
- git.kernel.org/stable/c/fe1bebd0edb22e3536cbc920ec713331d1367ad4 Patch
- lists.debian.org/debian-lts-announce/2025/08/msg00010.html Mailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing ListThird Party Advisory
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 12 · as of 7 November 2026
- CWE
- CWE-476
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.