Red Hat Enterprise Linux 7 update for kpatch-patch

1) 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

kpatch-patch-3_10_0-1160_62_1 (Red Hat package): 1-1.el7

kpatch-patch-3_10_0-1160_59_1 (Red Hat package): 1-1.el7 - 1-2.el7

kpatch-patch-3_10_0-1160_53_1 (Red Hat package): 1-2.el7 - 1-3.el7

kpatch-patch-3_10_0-1160_49_1 (Red Hat package): 1-2.el7 - 1-3.el7

kpatch-patch-3_10_0-1160_45_1 (Red Hat package): 1-1.el7 - 1-4.el7

kpatch-patch-3_10_0-1160_42_2 (Red Hat package): 1-1.el7 - 1-5.el7

kpatch-patch-3_10_0-1160_41_1 (Red Hat package): 1-1.el7 - 1-6.el7

kpatch-patch-3_10_0-1160_36_2 (Red Hat package): 1-1.el7 - 1-7.el7

Red Hat Enterprise Linux for Power, little endian: 7

Red Hat Enterprise Linux Server: 7

kpatch-patch-3_10_0-1160_66_1 (Red Hat package): before 1-1.el7

External links

http://access.redhat.com/errata/RHSA-2022:5216

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.