CVE-2024-35865
Description
A flaw was found in the Linux kernel's SMB client. A local user could trigger a use-after-free condition (accessing memory after it has been released) in the smb2_is_valid_oplock_break() function by referencing SMB sessions currently being terminated. This flaw primarily allows an attacker to cause a Denial of Service (DoS) through a system crash.
Statement
This vulnerability is assessed as Low severity for Red Hat Enterprise Linux because exploitation requires an established CIFS network share and authenticated local execution, restricting the blast radius strictly to a kernel denial of service rather than code execution or privilege escalation. Systems that do not mount remote SMB file shares do not load the vulnerable client module and remain unaffected. Additionally, successfully triggering the race condition relies on precise timing during session teardown, making reliable exploitation unlikely in standard enterprise deployments.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 9.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
