SB20261022104 - Use of Uninitialized Variable in Linux kernel gpio driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-98528)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• 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