Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2023-1476
CVE-2023-1476:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2023-1476 is a use-after-free vulnerability discovered in the Linux kernel's mm/mremap memory address space accounting source code. The vulnerability stems from a race condition between rmap walk and mremap operations, which was identified as an incomplete fix for the previous CVE-2022-41222 (Red Hat Advisory, Bugzilla).
Technical details
The vulnerability exists in the Linux kernel's mm/mremap.c source code, specifically related to memory address space accounting. The issue occurs due to a race condition between rmap walk and mremap operations. The flaw is related to how the kernel handles page table entries during memory remapping operations, particularly in the optimized version for PUD/PMD aligned mremap that doesn't properly hold the ptl lock (Kernel Commit).
Impact
The vulnerability could allow a local user to crash the system or potentially escalate their privileges. The issue can lead to use-after-free conditions and potential system instability (Bugzilla).
Mitigation and workarounds
The issue has been addressed in Linux kernel version 5.14-rc1 and backported to affected enterprise distributions. Red Hat has released security updates through RHSA-2023:1659 for Red Hat Enterprise Linux 8 systems (Red Hat Advisory).
Additional resources
Source: This report was generated using AI
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