Red Hat Enterprise Linux 8 update for kpatch-patch

1) Use-after-free

EUVDB-ID: #VU64668

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-2022-32250

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 incorrect NFT_STATEFUL_EXPR in net/netfilter/nf_tables_api.c in Linux kernel. A local user with ability to create user/net namespaces can execute arbitrary code with root privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

kpatch-patch-4_18_0-372_9_1 (Red Hat package): 1-1.el8

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 8.6

Red Hat Enterprise Linux Server - TUS: 8.6

Red Hat Enterprise Linux Server - AUS: 8.6

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.6

Red Hat Enterprise Linux for x86_64: 8.0

kpatch-patch-4_18_0-372_16_1 (Red Hat package): before 1-1.el8_6

kpatch-patch-4_18_0-372_13_1 (Red Hat package): before 1-1.el8_6

External links

http://access.redhat.com/errata/RHSA-2022:5839

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.