SB20260625131 - Off-by-one in Linux kernel arm64 net

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Main Vulnerability Database SB20260625131

SB20260625131 - Off-by-one in Linux kernel arm64 net

Published: June 25, 2026

Security Bulletin ID SB20260625131
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) Off-by-one (CVE-ID: CVE-2026-53036)

CWE-ID: CWE-193 - Off-by-one Error

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 cause a denial of service.

The vulnerability exists due to an off-by-one error in the arm64 BPF JIT immediate range check in check_imm() when validating branch displacement values for encoded BPF branch instructions. A local user can supply a crafted branch displacement value to cause a denial of service.

The issue can flip a forward branch into a backward one because the raw value is masked into the signed immediate field.


Remediation

Install update from vendor's website.

References