EUVD-2026-59443
GHSA-vvjm-q4pr-4r6c
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only exploitation via RDMA device access with low privileges; kernel memory corruption from incorrect index release justifies high C/I/A with no scope change.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx5: Release the HW‑provided UAR index rather than the SW one
Free the UAR index returned by the hardware.
AnalysisAI
Incorrect UAR index release in the Linux kernel RDMA/mlx5 driver allows a local attacker with low privileges to corrupt kernel-level resource tracking structures, potentially enabling privilege escalation, information disclosure, or denial-of-service via kernel crash. All kernel versions from 4.16 through the fixed stable releases (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) are affected on systems equipped with Mellanox/NVIDIA ConnectX RDMA hardware. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local, low-privilege access to a host running an affected Linux kernel (4.16 through versions preceding 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, or 7.2-rc1) with the mlx5_ib RDMA driver loaded and Mellanox/NVIDIA ConnectX hardware installed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a locally-exploitable kernel flaw that, if triggered, could yield full confidentiality, integrity, and availability impact at the kernel privilege level. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local user with low-privilege access on a Linux system equipped with accessible Mellanox/NVIDIA ConnectX RDMA hardware opens a user-space verbs context via libibverbs, allocates a UAR, and triggers its deallocation. The driver frees the incorrect (SW) UAR index, corrupting the kernel's internal resource-tracking table; repeated or carefully-timed invocations could destabilize kernel allocator state, potentially enabling local privilege escalation or a kernel panic. … |
| Remediation | The primary fix is to upgrade the Linux kernel to a patched stable release: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, or 7.2-rc1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all servers and infrastructure running Linux with RDMA hardware to identify systems running vulnerable kernel versions (4.16 through pre-patch 6.x series). …
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