Use of uninitialized resource in Linux kernel - CVE-2026-74584

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Main Vulnerability Database Vulnerabilities #VU144980

Use of uninitialized resource in Linux kernel - CVE-2026-74584

Published: August 24, 2026


Vulnerability identifier: #VU144980
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74584
CWE-ID: CWE-908
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to use of uninitialized memory in the bnxt_re shared userspace page allocation in bnxt_re_alloc_ucontext() when mapping the shared page to userspace through BNXT_RE_MMAP_SH_PAGE after IB_USER_VERBS_CMD_GET_CONTEXT. A local user can perform a single mmap() on the exposed page to disclose sensitive information.

Exploitation requires access to /dev/infiniband/uverbsX on a host with a bnxt_re device.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-74584

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

External References

Related Security Bulletins