Denial of service in Linux kernel net driver

1) Memory leak

EUVDB-ID: #VU89965

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47371

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the nexthops_dump() and EXPORT_SYMBOL() functions in net/ipv4/nexthop.c, within the vxlan_exit_batch_net() and register_nexthop_notifier() functions in drivers/net/vxlan.c. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/741760fa6252628a3d3afad439b72437d4b123d9
http://git.kernel.org/stable/c/3106a0847525befe3e22fc723909d1b21eb0d520

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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