Use of Uninitialized Variable in Linux kernel - CVE-2026-43349

Vulnerability identifier: #VU130842

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-2026-43349

CWE-ID: CWE-457

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 uninitialized memory access in f2fs_sanity_check_node_footer when processing a crafted f2fs filesystem image during mount or inode read operations. A local user can mount a specially crafted filesystem image to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

• https://git.kernel.org/stable/c/59970b2586fef4b13e96527b9d232bed30b640cd
• https://git.kernel.org/stable/c/7b9161a605e91d0987e2596a245dc1f21621b23f
• https://git.kernel.org/stable/c/a10b89343d41ceee1af0ec38d3a74e526c77fa09

• Use of Uninitialized Variable in Linux kernel f2fs
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure