CVE-2018-18559

MEDIUM

Description

In the Linux kernel through 4.19, a use-after-free can occur due to a race condition between fanout_add from setsockopt and bind on an AF_PACKET socket. This issue exists because of the 15fe076edea787807a7cdc168df832544b58eba6 incomplete fix for a race condition. The code mishandles a certain multithreaded case involving a packet_do_bind unregister action followed by a packet_notifier register action. Later, packet_release operates on only one of the two applicable linked lists. The attacker can achieve Program Counter control.

References

https://access.redhat.com/errata/RHBA-2019:0327

https://access.redhat.com/errata/RHSA-2019:0163

https://access.redhat.com/errata/RHSA-2019:0188

https://access.redhat.com/errata/RHSA-2019:1170

https://access.redhat.com/errata/RHSA-2019:1190

https://blogs.securiteam.com/index.php/archives/3731

Details

Source: MITRE

Published: 2018-10-22

Updated: 2019-05-14

Type: CWE-362

Risk Information

CVSS v2.0

Base Score: 6.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3.0

Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 2.2

Severity: HIGH