CVE-2024-50284
Description
From CVE.org
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix the missing xa_store error check xa_store() can fail, it return xa_err(-EINVAL) if the entry cannot be stored in an XArray, or xa_err(-ENOMEM) if memory allocation failed, so check error for xa_store() to fix it.
Statement
A flaw was found in the Linux kernel ksmbd SMB server where the return value of xa_store() in the session management code (fs/smb/server/mgmt/user_session.c) was not checked. If xa_store() fails, either because the entry cannot be stored in the XArray (xa_err(-EINVAL)) or because memory allocation failed (xa_err(-ENOMEM)), the code continues as though the entry had been stored successfully, leaving session management structures in an inconsistent state. The impact on Red Hat products is Low, with a Red Hat CVSS score of 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), reflecting a local attack vector that requires privileges and affects availability only; this is lower than the CVE.org record, which assigns a score of 7.5 with a network attack vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Within the Red Hat product portfolio, only the Fedora kernel is affected, and a fix is being pursued through the Fedora community kernel maintainers. Red Hat Enterprise Linux 6, 7, 8, and 9 kernels (both kernel and kernel-rt) are marked not affected by this flaw.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. For the affected Fedora kernel, updating to the latest released kernel packages applies the upstream fix.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | 7.5 |
| Attack Vector | Local | Local | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | None |
| Integrity Impact | None | None | None |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: 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:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Varies by Context; Unexpected State; Alter Execution Logic
An attacker could utilize an ignored error condition to place the system in an unexpected state that could lead to the execution of unintended logic and could cause other unintended behavior.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
