SB2026091831 - Use of uninitialized resource in Linux kernel copy_map_value_long()

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Main Vulnerability Database SB2026091831

SB2026091831 - Use of uninitialized resource in Linux kernel copy_map_value_long()

Published: September 18, 2026

Security Bulletin ID SB2026091831
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of uninitialized resource (CVE-ID: CVE-2026-93174)

CWE-ID: CWE-908 - Use of Uninitialized Resource

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 stale heap contents.

The vulnerability exists due to incomplete copying of per-CPU map value padding in copy_map_value_long() when processing UAPI LOOKUP_ELEM operations on per-CPU maps. A local user can invoke a UAPI lookup operation on a per-CPU map with a value size that requires padding to disclose stale heap contents.

The issue also affects bpf_iter for per-CPU maps.


Remediation

Install update from vendor's website.

References