Ubuntu update for linux

Published: 2023-08-30 | Updated: 2025-01-10

Risk	Medium
Patch available	YES
Number of vulnerabilities	11
CVE-ID	CVE-2022-40982 CVE-2023-20593 CVE-2023-21400 CVE-2023-3609 CVE-2023-3610 CVE-2023-3611 CVE-2023-3776 CVE-2023-3777 CVE-2023-3995 CVE-2023-4004 CVE-2023-4015
CWE-ID	CWE-1342 CWE-416 CWE-20 CWE-787 CWE-399 CWE-119
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #10 is available.
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-oem-20.04c (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem-20.04b (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem-20.04d (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-64k (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-64k-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oracle-lts-22.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-nvidia-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-nvidia (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-ibm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gkeop-5.15 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke-5.15 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-64k (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gcp-lts-22.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-lts-22.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-82-lowlatency-64k (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-82-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-82-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-82-generic-64k (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-82-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1043-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1041-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1040-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1040-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1040-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1036-ibm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1031-nvidia-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1031-nvidia (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.15.0-1026-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 11 vulnerabilities.

1) Information exposure through microarchitectural state after transient execution

EUVDB-ID: #VU79262

Risk: Medium

CVSSv4.0: 2.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-40982

CWE-ID: CWE-1342 - Information Exposure through Microarchitectural State after Transient Execution

Exploit availability: No

Description

The vulnerability allows a malicious guest to escalate privileges on the system.

The vulnerability exists due to the way data is shared between threads whereby the AVX GATHER instructions on Intel processors can forward the content of stale vector registers to dependent instructions. A malicious guest can infer data from different contexts on the same core and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 22.04

linux-image-oem-20.04c (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-oem-20.04b (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-oem-20.04d (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-gkeop (Ubuntu package): before 5.15.0.1026.25

linux-image-lowlatency-64k (Ubuntu package): before 5.15.0.82.84

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-oracle (Ubuntu package): before 5.15.0.1041.47~20.04.1

linux-image-oem-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.37

linux-image-lowlatency-64k-hwe-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.37

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-generic-64k-hwe-20.04 (Ubuntu package): before 5.15.0.82.91~20.04.40

linux-image-aws (Ubuntu package): before 5.15.0.1043.48~20.04.31

linux-image-virtual (Ubuntu package): before 5.15.0.82.78

linux-image-oracle-lts-22.04 (Ubuntu package): before 5.15.0.1041.36

linux-image-nvidia-lowlatency (Ubuntu package): before 5.15.0.1031.31

linux-image-nvidia (Ubuntu package): before 5.15.0.1031.31

linux-image-lowlatency (Ubuntu package): before 5.15.0.82.84

linux-image-kvm (Ubuntu package): before 5.15.0.1040.36

linux-image-ibm (Ubuntu package): before 5.15.0.1036.32

linux-image-gkeop-5.15 (Ubuntu package): before 5.15.0.1026.25

linux-image-gke-5.15 (Ubuntu package): before 5.15.0.1040.39

linux-image-gke (Ubuntu package): before 5.15.0.1040.39

linux-image-generic-lpae (Ubuntu package): before 5.15.0.82.78

linux-image-generic-64k (Ubuntu package): before 5.15.0.82.78

linux-image-generic (Ubuntu package): before 5.15.0.82.78

linux-image-gcp-lts-22.04 (Ubuntu package): before 5.15.0.1040.36

linux-image-aws-lts-22.04 (Ubuntu package): before 5.15.0.1043.42

linux-image-5.15.0-82-lowlatency-64k (Ubuntu package): before 5.15.0-82.91~20.04.1

linux-image-5.15.0-82-lowlatency (Ubuntu package): before 5.15.0-82.91~20.04.1

linux-image-5.15.0-82-generic-lpae (Ubuntu package): before 5.15.0-82.91~20.04.1

linux-image-5.15.0-82-generic-64k (Ubuntu package): before 5.15.0-82.91~20.04.1

linux-image-5.15.0-82-generic (Ubuntu package): before 5.15.0-82.91~20.04.1

linux-image-5.15.0-1043-aws (Ubuntu package): before 5.15.0-1043.48~20.04.1

linux-image-5.15.0-1041-oracle (Ubuntu package): before 5.15.0-1041.47~20.04.1

linux-image-5.15.0-1040-kvm (Ubuntu package): before 5.15.0-1040.45

linux-image-5.15.0-1040-gke (Ubuntu package): before 5.15.0-1040.45

linux-image-5.15.0-1040-gcp (Ubuntu package): before 5.15.0-1040.48

linux-image-5.15.0-1036-ibm (Ubuntu package): before 5.15.0-1036.39

linux-image-5.15.0-1031-nvidia-lowlatency (Ubuntu package): before 5.15.0-1031.31

linux-image-5.15.0-1031-nvidia (Ubuntu package): before 5.15.0-1031.31

linux-image-5.15.0-1026-gkeop (Ubuntu package): before 5.15.0-1026.31

CPE2.3

External links

https://ubuntu.com/security/notices/USN-6315-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Use-after-free

EUVDB-ID: #VU78572

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-2023-20593

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 in AMD Zen2 processors. A local user can trigger a use-after-free error and execute arbitrary code on the system.

Note, the vulnerability was dubbed Zenbleed.