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PatchSiren cyber security CVE debrief

CVE-2026-74296 Linux CVE debrief

A high-severity vulnerability has been resolved in the Linux kernel, specifically in the RDMA/mlx5 component. The issue involves releasing the hardware-provided UAR index instead of the software one. This vulnerability has been assigned a CVSS score of 7.8 and is considered high severity. Linux system administrators and security teams should assess exposure and prioritize patch deployment for systems using the affected RDMA/mlx5 component, especially for versions prior to the fixed commits. The vulnerability is resolved through a series of commits in the Linux kernel's stable branch. Defenders should prioritize assessing exposure and verifying patch deployment for Linux systems.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-15
Original CVE updated
2026-10-16
Advisory published
2026-08-15
Advisory updated
2026-10-16

Who should care

Linux system administrators and security teams should assess exposure and prioritize patch deployment for systems using the affected RDMA/mlx5 component, especially for versions prior to the fixed commits.

Why it matters

CVE-2026-74296 is a high-severity vulnerability in the Linux kernel's RDMA/mlx5 component. Defenders should assess exposure and prioritize patch deployment for Linux systems using the affected component, focusing on versions prior to the fixed commits.

  • Verify patch deployment for Linux systems using the affected RDMA/mlx5 component
  • Assess exposure of Linux systems to potential privilege escalation
  • Prioritize updates for versions prior to the fixed commits

Technical summary

The Linux kernel vulnerability CVE-2026-74296, with a CVSS score of 7.8, involves a fix in the RDMA/mlx5 component to release the hardware-provided UAR index. The vulnerability is addressed through multiple commits in the Linux kernel's stable branch, including 80f1f49f53a42733e60c90e0ec545e647969214d, aabfc845838ef453f1d22d7665596f9cc48be7dd, 6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee, d3ff718c0c7153e2641e6a09507bace14fc5c402, ef369446f62903ea079e8a7954b5bf8bb8300fe3, and 449ae7927152e46acbe5f19f97eafdae6d3a96b1. Defenders should prioritize assessing exposure and verifying patch deployment for Linux systems using the affected RDMA/mlx5 component, focusing on versions prior to the fixed commits.

Defensive priority

Defenders should prioritize assessing exposure and verifying patch deployment for Linux systems using the affected RDMA/mlx5 component, focusing on versions prior to the fixed commits.

Recommended defensive actions

  • Assess exposure of Linux systems using the affected RDMA/mlx5 component
  • Verify patch deployment for versions prior to the fixed commits
  • Inventory Linux systems for potential updates or patches
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is resolved through a series of commits in the Linux kernel's stable branch, including 80f1f49f53a42733e60c90e0ec545e647969214d, aabfc845838ef453f1d22d7665596f9cc48be7dd, 6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee, d3ff718c0c7153e2641e6a09507bace14fc5c402, ef369446f62903ea079e8a7954b5bf8bb8300fe3, and 449ae7927152e46acbe5f19f97eafdae6d3a96b1.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-74296 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-74296

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

  • CVE-2026-74296 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-74296

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

Supplemental references

  • RDMA/mlx5: Release the HW‑provided UAR index rather than the SW one

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/74xxx/CVE-2026-74296.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/80f1f49f53a42733e60c90e0ec545e647969214d

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/aabfc845838ef453f1d22d7665596f9cc48be7dd

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/d3ff718c0c7153e2641e6a09507bace14fc5c402

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ef369446f62903ea079e8a7954b5bf8bb8300fe3

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/449ae7927152e46acbe5f19f97eafdae6d3a96b1

    Supplemental source

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.