CVE-2024-27414

CVE Details

Release Date:	2024-05-17
Impact:	Low	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved:\nrtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back\nIn the commit d73ef2d69c0d ('rtnetlink: let rtnl_bridge_setlink checks\nIFLA_BRIDGE_MODE length'), an adjustment was made to the old loop logic\nin the function `rtnl_bridge_setlink` to enable the loop to also check\nthe length of the IFLA_BRIDGE_MODE attribute. However, this adjustment\nremoved the `break` statement and led to an error logic of the flags\nwriting back at the end of this function.\nif (have_flags)\nmemcpy(nla_data(attr), &flags, sizeof(flags));\n// attr should point to IFLA_BRIDGE_FLAGS NLA !!!\nBefore the mentioned commit, the `attr` is granted to be IFLA_BRIDGE_FLAGS.\nHowever, this is not necessarily true fow now as the updated loop will let\nthe attr point to the last NLA, even an invalid NLA which could cause\noverflow writes.\nThis patch introduces a new variable `br_flag` to save the NLA pointer\nthat points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned\nerror logic.

See more information about CVE-2024-27414 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 9 (kernel)	ELSA-2024-9315	2024-11-14