Infinite loop in Linux kernel - CVE-2026-98394

Vulnerability identifier: #VU155924

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98394

CWE-ID: CWE-835

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service through busy-waiting.

The vulnerability exists due to failure to terminate a receive loop in unix_stream_read_generic() in net/unix/af_unix.c when manage_oob() returns NULL for a zero-length receive buffer. A local user can issue a zero-length blocking recv() call with MSG_PEEK on a UNIX domain stream socket whose last queued socket buffer contains MSG_OOB data to cause a denial of service through busy-waiting.

The affected code requires CONFIG_AF_UNIX_OOB to be enabled.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713
• https://git.kernel.org/stable/c/6e5ee08eb5858d175da6768d75d163817b6a9d4a
• https://git.kernel.org/stable/c/c81c5be3826c8467945b964d0cf7f7b3d65461db
• https://git.kernel.org/stable/c/d5dd55b316ca229a4cbf11729483ba5bb57233e7

• Infinite loop in Linux kernel unix
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more