SB2025091735 - Buffer overflow in Linux kernel efi stmm driver
Published: September 17, 2025
Security Bulletin ID
SB2025091735
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Buffer overflow (CVE-ID: CVE-2025-39836)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory corruption within the mm_communicate(), setup_mm_hdr(), get_max_payload(), get_property_int(), tee_get_variable(), tee_get_next_variable(), tee_set_variable() and tee_query_variable_info() functions in drivers/firmware/efi/stmm/tee_stmm_efi.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.