SB20260824118 - Race condition in Linux kernel packet

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Main Vulnerability Database SB20260824118

SB20260824118 - Race condition in Linux kernel packet

Published: August 24, 2026

Security Bulletin ID SB20260824118
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) Race condition (CVE-ID: CVE-2026-74668)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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 inconsistent use of hard_header_len in the tpacket_snd() transmit ring send path in net/packet/af_packet.c when processing tx ring frames during packet transmission. A local user can trigger concurrent netdevice reconfiguration and send crafted ring frames to cause a denial of service.

The issue can make the reserved headroom smaller than the amount later pushed, or make the computed copy length negative.


Remediation

Install update from vendor's website.

References