SB20261023132 - Stack-based buffer overflow in Linux kernel regulator driver

Description

This security bulletin contains information about 1 vulnerability.

1) Stack-based buffer overflow (CVE-ID: CVE-2026-99021)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to corrupt kernel memory, potentially causing a denial of service.

The vulnerability exists due to a stack-based buffer overflow in of_regulator_bulk_get_all() in the Linux kernel regulator subsystem when copying device-tree supply names into a fixed 64-byte stack buffer without bounding the copy to the buffer size. A local privileged user can provide an excessively long supply name, if able to influence the device-tree properties processed by this function, to overwrite stack memory and potentially cause a kernel crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/82ac8c4939bdbd064b4f54a580fbe4baf0d60e41
• https://git.kernel.org/stable/c/a3384ec2516a7cc567bd7c09029282494469b247
• https://git.kernel.org/stable/c/e2151c29cec73f6cc70abf1c7cbc7b9b202489f5