Use of Uninitialized Variable in Linux kernel - CVE-2026-98528

Vulnerability identifier: #VU156830

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98528

CWE-ID: CWE-457

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose kernel stack contents.

The vulnerability exists due to use of uninitialized stack memory in gpio_desc_to_lineinfo() when GPIO chip guard acquisition fails during line information retrieval. A local user can request GPIO line information through lineinfo_get_v1() to obtain kernel stack contents from an information structure returned to user space without being initialized.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/1feb5d39b05afd902ed9fc902ec5b15be03a4bdb
• https://git.kernel.org/stable/c/60a466f231905cd96ae6f0f3c44a710c97873dac
• https://git.kernel.org/stable/c/8460ee5216ab9a38263b01dca4b0a27e083f70f3
• https://git.kernel.org/stable/c/cf3d043582e106a0e57002bec8a6de8929ba3e1c

• Use of Uninitialized Variable in Linux kernel gpio driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more