Ubuntu update for linux

1) Use-after-free

EUVDB-ID: #VU102035

Risk: Low

CVSSv4.0: 5.9 [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/E:U/U:Clear]

CVE-ID: CVE-2024-56672

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the blkcg_unpin_online() function in block/blk-cgroup.c. A local user can escalate privileges on the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 22.04

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.15.0.134.145~20.04.1

linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package): before 5.15.0.134.145~20.04.1

linux-image-virtual (Ubuntu package): before 5.15.0.134.133

linux-image-lowlatency-64k (Ubuntu package): before 5.15.0.134.121

linux-image-lowlatency (Ubuntu package): before 5.15.0.134.121

linux-image-generic-lpae (Ubuntu package): before 5.15.0.134.133

linux-image-generic-64k (Ubuntu package): before 5.15.0.134.133

linux-image-generic (Ubuntu package): before 5.15.0.134.133

linux-image-5.15.0-134-lowlatency-64k (Ubuntu package): before 5.15.0-134.145~20.04.1

linux-image-5.15.0-134-lowlatency (Ubuntu package): before 5.15.0-134.145~20.04.1

linux-image-5.15.0-134-generic-lpae (Ubuntu package): before 5.15.0-134.145

linux-image-5.15.0-134-generic-64k (Ubuntu package): before 5.15.0-134.145

linux-image-5.15.0-134-generic (Ubuntu package): before 5.15.0-134.145

CPE2.3

• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:linux-image-lowlatency-hwe-20.04:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-lowlatency-64k-hwe-20.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-virtual_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-lowlatency-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-5_15_0-134-lowlatency-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-5_15_0-134-lowlatency_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-5_15_0-134-generic-lpae_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-5_15_0-134-generic-64k_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-5_15_0-134-generic_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-7327-1

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.