CVE-2023-31436

2023-05-0218:22:34

redhat.com

access.redhat.com

linux kernel; local privilege escalation; qos subsystem; out-of-bounds; memory access; sch_qfq; module blacklist

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0.001

Percentile

17.8%

JSON

An out-of-bounds memory access flaw was found in the Linux kernel’s traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Mitigation

To mitigate this issue, prevent the module, sch_qfq from being loaded. Please see <https://access.redhat.com/solutions/41278> for information on how to blacklist a kernel module to prevent it from loading automatically.