CVE-2026-74296

Local privilege escalation via wrong UAR release

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the Linux kernel RDMA/mlx5 driver allows local users to gain kernel privileges through a failed UAR mapping. The uar_mmap error path gives the deallocator the software-managed UAR index instead of the hardware-returned index, freeing another context's live resource. Access to an mlx5 /dev/infiniband/uverbs device is required; cross-context reuse can expose device state, alter device operations, or crash the host.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel RDMA/mlx5 driver allows local users to gain kernel privileges through a failed UAR mapping. The uar_mmap error path gives the deallocator the software-managed UAR index instead of the hardware-returned index, freeing another context's live resource. Access to an mlx5 /dev/infiniband/uverbs device is required; cross-context reuse can expose device state, alter device operations, or crash the host.

The record

CVE
CVE-2026-74296
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.16
  2. Affected versionversion=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <449ae7927152e46acbe5f19f97eafdae6d3a96b1
  3. Affected versionversion=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee
  4. Affected versionversion=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <80f1f49f53a42733e60c90e0ec545e647969214d
  5. Affected versionversion=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <aabfc845838ef453f1d22d7665596f9cc48be7dd
  6. Affected versionversion=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <d3ff718c0c7153e2641e6a09507bace14fc5c402
  7. Affected versionversion=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <ef369446f62903ea079e8a7954b5bf8bb8300fe3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <449ae7927152e46acbe5f19f97eafdae6d3a96b1; version=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <6f83de384ca582fa87b4c2b0d03bd1ed3bf9a2ee; version=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <80f1f49f53a42733e60c90e0ec545e647969214d; version=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <aabfc845838ef453f1d22d7665596f9cc48be7dd; version=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <d3ff718c0c7153e2641e6a09507bace14fc5c402; version=4ed131d0bb1597ce12fff22d9d7fc9720a6e8cf0 <ef369446f62903ea079e8a7954b5bf8bb8300fe3

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.6Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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