Ubuntu update for linux-oem-5.10



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-20194
CVE-2021-3347
CVE-2021-3348
CWE-ID CWE-122
CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

linux-image-oem-20.04b (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.10.0-1017-oem (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Heap-based buffer overflow

EUVDB-ID: #VU60356

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20194

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within the __cgroup_bpf_run_filter_getsockopt() function, when kernel is compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered. A local user can trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1017.18

linux-image-5.10.0-1017-oem (Ubuntu package): before 5.10.0-1017.18

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4884-1


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.

2) Use-after-free

EUVDB-ID: #VU52035

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-2021-3347

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error when handling PI futexes. A local user can run a specially crafted program to trigger a use-after-free error and execute arbitrary code with elevated privileges.


Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1017.18

linux-image-5.10.0-1017-oem (Ubuntu package): before 5.10.0-1017.18

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4884-1


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.

3) Use-after-free

EUVDB-ID: #VU83433

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3348

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the nbd_add_socket in drivers/block/nbd.c. A local authenticated user can trigger a use-after-free error and escalate privileges on the system.

Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1017.18

linux-image-5.10.0-1017-oem (Ubuntu package): before 5.10.0-1017.18

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4884-1


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.



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