Race condition in Linux kernel - CVE-2026-43371

Vulnerability identifier: #VU130806

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-43371

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a race condition in the macb driver transmit ring handling when resuming transmission after transmit has been disabled. A local user can trigger network transmission during this state to cause a denial of service.

The issue can leave transmission stuck until a new packet is queued, and queued packets may be silently lost with associated skb memory not being released.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - update to 6.8.0-1061.64+1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1

• https://git.kernel.org/stable/c/0a47c3889fcd843c72aa57fa8c4d06f5801fced4
• https://git.kernel.org/stable/c/403182e0771b250cfde0fe7e1081d095ceaf8230
• https://git.kernel.org/stable/c/58f5d34f88e8f00910b692537f7b2efdb8c3705d
• https://git.kernel.org/stable/c/881a0263d502e1a93ebc13a78254e9ad19520232
• https://git.kernel.org/stable/c/88f974fe118cb4653f029929ecbca7cfe06132ae
• https://git.kernel.org/stable/c/c6783bfa31a59f34fe4feb1bdbf67791ef3fb0b7

• Race condition in Linux kernel ethernet cadence driver
• Ubuntu update for linux
• Ubuntu update for linux-gcp-fips
• Ubuntu update for linux-oracle-6.8
• Ubuntu update for linux-fips
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-aws
• Ubuntu update for linux-aws-6.8
• Ubuntu update for linux-ibm