SB20261023204 - Use of uninitialized resource in Linux kernel btrfs

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Main Vulnerability Database SB20261023204

SB20261023204 - Use of uninitialized resource in Linux kernel btrfs

Published: October 23, 2026

Security Bulletin ID SB20261023204
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of uninitialized resource (CVE-ID: CVE-2026-98959)

CWE-ID: CWE-908 - Use of Uninitialized Resource

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to corrupt filesystem metadata and cause a denial of service affecting Btrfs filesystem operations.

The vulnerability exists due to use of an incompletely initialized btrfs_dir_item in the Linux kernel's btrfs_setxattr() function when replacing an extended attribute with a differently sized value while multiple attributes share the same item. A local user can create extended attributes with colliding name hashes and replace one attribute's value with a differently sized value to corrupt attribute metadata and trigger a filesystem transaction abort.


Remediation

Install update from vendor's website.

References