Out-of-bounds read in Linux kernel - CVE-2026-89649
Published: September 12, 2026
Vulnerability identifier: #VU149162
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89649
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the CephFS __build_xattrs() function when processing metadata-server-supplied extended attribute blobs. A remote privileged user can provide a crafted extended attribute blob with a final attribute value length that exceeds the available data to disclose sensitive information.
A local user must invoke getxattr(2) on a CephFS file.
Affected software
Linux kernel
How to mitigate CVE-2026-89649
Install security update from vendor's repository.