SB20260815209 - Race condition in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74260)

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 a race condition in nf_dup_netdev and nft_fwd_netdev when transmitting duplicated or forwarded packets. A local user can trigger packet transmission in a way that causes imbalanced recursion counter decrementation to cause a denial of service.

The issue is related to possible migration to a different CPU during packet transmission.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2354e975932dabb06fad239f07a3b68fd1809737
• https://git.kernel.org/stable/c/edf234f71fb327792196f813048ab8f5bd3bb712