Improper Initialization in Linux kernel - CVE-2022-29968

Vulnerability identifier: #VU64091

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-29968

CWE-ID: CWE-665

Exploitation vector: Local access

Exploit availability: Public exploit is available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to io_uring subsystem in the Linux kernel does not properly initialize data in some situations. A local user can run a specially crafted application to execute arbitrary code with escalated privileges on the system.

Linux kernel
Ubuntu
Fedora
linux-image-oem-22.04 (Ubuntu package)
linux-image-oem-22.04a (Ubuntu package)
kernel
kernel-headers
kernel-tools
linux-image-5.17.0-1011-oem (Ubuntu package)

Install updates from vendor's website.

Linux kernel - update to 5.18 rc5
linux-image-oem-22.04 (Ubuntu package) - update to 5.17.0.1011.10
linux-image-oem-22.04a (Ubuntu package) - update to 5.17.0.1011.10
linux-image-5.17.0-1011-oem (Ubuntu package) - update to 5.17.0-1011.12
kernel - addressed in versions 5.17.6-100.fc34, 5.17.6-200.fc35, 5.17.6-300.fc36
kernel-headers - addressed in versions 5.17.6-100.fc34, 5.17.6-200.fc35, 5.17.6-300.fc36
kernel-tools - addressed in versions 5.17.6-100.fc34, 5.17.6-200.fc35, 5.17.6-300.fc36

• Exploit #8238 - CVE-2022-29968 (Exploit PoC for CVE-2022-29968 by Joseph Ravichandran and Michael Wang) (August 10, 2022)

• https://github.com/torvalds/linux/commit/32452a3eb8b64e01e2be717f518c0be046975b9d
• https://bugzilla.redhat.com/show_bug.cgi?id=2080940

• Ubuntu update for linux-oem-5.17
• Fedora 35 update for kernel, kernel-headers, kernel-tools
• Fedora 36 update for kernel, kernel-headers, kernel-tools
• Fedora 34 update for kernel, kernel-headers, kernel-tools