SB20260727228 - Out-of-bounds read in Linux kernel bpf

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Main Vulnerability Database SB20260727228

SB20260727228 - Out-of-bounds read in Linux kernel bpf

Published: July 27, 2026

Security Bulletin ID SB20260727228
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-64355)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [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]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds access in dev_map_enqueue_clone() and dev_map_redirect_clone() when cloning fragmented native XDP frames or nonlinear generic XDP packets for devmap broadcast redirects. A local user can trigger clone-based broadcast handling with a crafted fragmented frame to cause a denial of service.

The issue occurs because fragment metadata is not present in the linear cloned frame, and later frame return can interpret uninitialized tail data as skb_shared_info.


Remediation

Install update from vendor's website.

References