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CVE-2024-35960 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Properly link new fs rules into the tree Previously, add_rule_fg would only add newly created rules from the handle into the tree when they had a refcount of 1. On the other hand, create_flow_handle tries hard to find and reference already existing identical rules instead of creating new ones. These two behaviors can result in a situation where create_flow_handle 1) creates a new rule and references it, then 2) in a subsequent step during the same handle creation references it again, resulting in a rule with a refcount of 2 that is not linked into the tree, will have a NULL parent and root and will result in a crash when the flow group is deleted because del_sw_hw_rule, invoked on rule deletion, assumes node->parent is != NULL. This happened in the wild, due to another bug related to incorrect handling of duplicate pkt_reformat ids, which lead to the code in create_flow_handle incorrectly referencing a just-added rule in the same flow handle, resulting in the problem described above. Full details are at [1]. This patch changes add_rule_fg to add new rules without parents into the tree, properly initializing them and avoiding the crash. This makes it more consistent with how rules are added to an FTE in create_flow_handle.


Severity



CVSS 4.0 Severity and Metrics:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/1263b0b26077b1183c3c45a0a2479573a351d423
https://git.kernel.org/stable/c/2e8dc5cffc844dacfa79f056dea88002312f253f
https://git.kernel.org/stable/c/3d90ca9145f6b97b38d0c2b6b30f6ca6af9c1801
https://git.kernel.org/stable/c/5cf5337ef701830f173b4eec00a4f984adeb57a0
https://git.kernel.org/stable/c/7aaee12b804c5e0374e7b132b6ec2158ff33dd64
https://git.kernel.org/stable/c/7c6782ad4911cbee874e85630226ed389ff2e453
https://git.kernel.org/stable/c/adf67a03af39095f05d82050f15813d6f700159d
https://git.kernel.org/stable/c/de0139719cdda82806a47580ca0df06fc85e0bd2

Weakness Enumeration

CWE-ID CWE Name Source

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-35960
NVD Published Date:
05/20/2024
NVD Last Modified:
05/20/2024
Source:
kernel.org