CVE-2021-33033

high

Description

The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8

https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt

https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e

Details

Source: MITRE

Published: 2021-05-14

Updated: 2021-06-09

Type: CWE-416

Risk Information

CVSS v2

Base Score: 4.6

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

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH