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CVE-2026-46312 Linux CVE debrief

A vulnerability was found in the Linux kernel's videobuf2 module. The vulnerability occurs when the `vb2_dma_sg_mmap` function does not set the `VM_DONTEXPAND` and `VM_DONTDUMP` flags, which can cause a warning in the `drm_gem_mmap_obj` function during the mmap operation of an imported dma-buf from the out-of-tree Apple ISP camera capture driver.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Users of the Linux kernel, particularly those using the videobuf2 module, should be aware of this vulnerability.

Technical summary

The vulnerability is caused by the `vb2_dma_sg_mmap` function not setting the `VM_DONTEXPAND` and `VM_DONTDUMP` flags. This can cause a warning in the `drm_gem_mmap_obj` function during the mmap operation of an imported dma-buf from the out-of-tree Apple ISP camera capture driver.

Defensive priority

Medium

Recommended defensive actions

  • Update the Linux kernel to a version that includes the fix for this vulnerability.
  • Use a kernel version that has the videobuf2 module with the `VM_DONTEXPAND` and `VM_DONTDUMP` flags set.

Evidence notes

The vulnerability was fixed by setting the `VM_DONTEXPAND` and `VM_DONTDUMP` flags in the `vb2_dma_sg_mmap` function.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46312 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46312

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46312 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46312

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/1a1360264f699521e001e7739009ee3ee3c6a4f5

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/21fade52ab9fb13368a5709e60b0d9909197aeae

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/7254b31a13aaa0c2c0f9ffbc335b718656117ff4

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b4cf91658a636618f1437beec971dec25dec28eb

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/feb17524aa4ec337749344be0db52b88663e25ab

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.