Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2022-49388
CVE-2022-49388:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49388 is a use-after-free vulnerability discovered in the Linux kernel's UBI (Unsorted Block Images) subsystem. The vulnerability specifically affects the ubicreatevolume() function in the error handling path. The issue was identified and resolved in 2022, with the fix being implemented to address memory management issues during volume creation failures (NVD, RedHat).
Technical details
The vulnerability occurs due to a redundant release of 'ebatbl' in the error handling path of ubicreatevolume(). The problematic sequence involves ubiebareplacetable(vol, ebatbl) followed by vol->ebatbl = tbl, then ubiebadestroytable(ebatbl) which frees 'ebatbl', and finally a use-after-free condition when accessing tbl->entries during volrelease (Kernel Commit). The vulnerability has been assigned a CVSS v3.1 base score of 7.8 (HIGH) with vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (CISA-ADP).
Impact
The vulnerability could potentially lead to memory corruption and system instability when creating UBI volumes that fail during initialization. This use-after-free condition could result in privilege escalation, information disclosure, or system crashes (NVD).
Mitigation and workarounds
The vulnerability has been fixed by removing the redundant 'ebatbl' releasing in the error handling path. The fix was implemented through a patch that removes the redundant call to ubiebadestroytable(eba_tbl) (Kernel Commit).
Additional resources
Source: This report was generated using AI
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