VDB-255620 · CVE-2024-26622 · Nessus 209075

Linux Kernel up to 6.8-rc6 tomoyo_write_control use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.7	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.8-rc6. This affects the function tomoyo_write_control. Such manipulation leads to use after free. This vulnerability is referenced as CVE-2024-26622. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.8-rc6 (Operating System). Affected by this issue is the function tomoyo_write_control. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: tomoyo: fix UAF write bug in tomoyo_write_control() Since tomoyo_write_control() updates head->write_buf when write() of long lines is requested, we need to fetch head->write_buf after head->io_sem is held. Otherwise, concurrent write() requests can cause use-after-free-write and double-free problems.

The weakness was published 03/04/2024. The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2024-26622 since 02/19/2024. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/11/2024).

The vulnerability scanner Nessus provides a plugin with the ID 209075 (SUSE SLES15 Security Update : kernel RT (Live Patch 10 for SLE 15 SP5) (SUSE-SU-2024:3631-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.8-rc7 eliminates this vulnerability. Applying the patch 2f03fc340cac is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (209075). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 209075
Nessus Name: SUSE SLES15 Security Update : kernel RT (Live Patch 10 for SLE 15 SP5) (SUSE-SU-2024:3631-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.8-rc7
Patch: 2f03fc340cac

Timelineinfo

02/19/2024 🔍
03/04/2024 +14 days 🔍
03/04/2024 +0 days 🔍
12/11/2024 +282 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2024-5db5954a5e
Status: Confirmed

CVE: CVE-2024-26622 (🔍)
GCVE (CVE): GCVE-0-2024-26622
GCVE (VulDB): GCVE-100-255620

Entryinfo

Created: 03/04/2024 08:05
Updated: 12/11/2024 21:17
Changes: 03/04/2024 08:05 (42), 04/04/2024 11:33 (15), 06/26/2024 08:57 (1), 10/16/2024 17:14 (3), 12/11/2024 21:17 (11)
Complete: 🔍
Cache ID: 216::103