CVE-2023-53616
Description
A double-free vulnerability was found in the Linux kernel JFS filesystem's inode map cleanup. A local user with privileges to mount filesystems can mount a JFS filesystem, perform a remount operation that fails after freeing internal structures, then unmount the filesystem, causing the cleanup code to free the same memory twice, which results in memory corruption and denial of service through kernel crash.
Statement
During JFS filesystem cleanup, diUnmount() fails to set JFS_IP(ipimap)->i_imap to NULL after freeing it. When jfs_remount() frees this structure but then diMount() fails during remount processing, the pointer remains non-NULL. On subsequent filesystem unmount, diUnmount() executes again and attempts to free the already-freed pointer, causing a double-free detected by KASAN.
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 | 7.8 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | High | High |
| Integrity Impact | None | High | High |
| 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:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Availability,Integrity
Technical Impact: DoS: Crash, Exit, or Restart
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