CVE-2026-93798
Received Received - Intake

BaseFortify

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reloc root cleanup in merge_reloc_roots() If the root we got has zero root refs in its root item, we are resetting the root's ->reloc_root without using barriers like we do everywhere else. Sashiko complained about this while reviewing another patch, and it's correct (see the Link tag below). Also, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless the root points to the reloc root we have. Fix this by using clear_reloc_root(), which issues the memory barrier after setting the root's ->reloc_root to NULL and before clearing the bit BTRFS_ROOT_DEAD_RELOC_TREE from the root.

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-93798
EUVD
EUVD-2026-86185

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel btrfs *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability in the BTRFS filesystem. It involves improper cleanup during root relocation operations where memory barriers are not used correctly when resetting a root's reloc_root pointer. This could lead to race conditions or memory corruption in the filesystem handling.

Detection Guidance

This vulnerability is specific to the Linux kernel's btrfs filesystem and cannot be detected via network scanning or general system commands. It requires checking the kernel version and btrfs filesystem status. Use uname -a to check the kernel version and verify if it is affected. Inspect btrfs filesystem logs or mount points for errors related to reloc roots.

Impact Analysis

If exploited, this flaw could cause filesystem corruption, data loss, or system crashes. Users relying on BTRFS for storage may experience instability or unrecoverable errors during filesystem operations.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. Reboot the system after applying the update to ensure the patched kernel is active. Monitor btrfs filesystem operations for any unusual behavior or errors.

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