Red Hat Enterprise Linux 8.2 Extended Update Support update for kernel

1) Out-of-bounds write

EUVDB-ID: #VU51549

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-29368

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing untrusted input within the __split_huge_pmd() function in mm/huge_memory.c in the Linux kernel. A local user can abuse the copy-on-write implementation and gain unintended write access because of a race condition in a THP mapcount check.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server - AUS: 8.2

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.2

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.2

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 8.2

kernel (Red Hat package): 4.18.0-193.6.3.el8_2 - 4.18.0-193.80.1.el8_2

Red Hat Enterprise Linux Server - TUS: 8.2

External links

http://access.redhat.com/errata/RHSA-2022:5220

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) Memory leak

EUVDB-ID: #VU64079

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-1012

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient randomization in the net/ipv4/tcp.c when calculating port offsets in Linux kernel cause by small table perturb size. A remote attacker can cause memory leak and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server - AUS: 8.2

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.2

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.2

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 8.2

kernel (Red Hat package): 4.18.0-193.6.3.el8_2 - 4.18.0-193.80.1.el8_2

Red Hat Enterprise Linux Server - TUS: 8.2

External links

http://access.redhat.com/errata/RHSA-2022:5220

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

3) Race condition

EUVDB-ID: #VU64156

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-1729

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition within sys_perf_event_open() in Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server - AUS: 8.2

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.2

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.2

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 8.2

kernel (Red Hat package): 4.18.0-193.6.3.el8_2 - 4.18.0-193.80.1.el8_2

Red Hat Enterprise Linux Server - TUS: 8.2

External links

http://access.redhat.com/errata/RHSA-2022:5220

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.

4) Use-after-free

EUVDB-ID: #VU64070

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2022-1966

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a use-after-free error in the Linux kernel's Netfilter subsystem in net/netfilter/nf_tables_api.c. A local user can trigger use-after-free error to escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server - AUS: 8.2

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.2

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.2

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 8.2

kernel (Red Hat package): 4.18.0-193.6.3.el8_2 - 4.18.0-193.80.1.el8_2

Red Hat Enterprise Linux Server - TUS: 8.2

External links

http://access.redhat.com/errata/RHSA-2022:5220

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. However, proof of concept for this vulnerability is available.

5) Heap-based buffer overflow

EUVDB-ID: #VU61672

Risk: Low

CVSSv3.1: 6.3 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2022-27666

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

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error within IPsec ESP transformation code in net/ipv4/esp4.c and net/ipv6/esp6.c in Linux kernel. A local unprivileged user can pass specially crafted data to the system, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server - AUS: 8.2

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support: 8.2

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.2

Red Hat Enterprise Linux for ARM 64 - Extended Update Support: 8.2

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions: 8.2

kernel (Red Hat package): 4.18.0-193.6.3.el8_2 - 4.18.0-193.80.1.el8_2

Red Hat Enterprise Linux Server - TUS: 8.2

External links

http://access.redhat.com/errata/RHSA-2022:5220

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. However, proof of concept for this vulnerability is available.