Raw inode disclosure via unbounded filename logging
Published Sep 16, 2026 · Updated Sep 16, 2026
Out-of-bounds read in Linux F2FS recovery logging allows local users to expose raw inode fields through a 255-byte filename. recover_inode() and recover_dentry() pass the non-NUL-terminated i_name buffer to %s, so logging continues beyond its stored length. Triggering the read requires roll-forward recovery of an F2FS inode with a maximum-length name, and the bounded consequence is disclosure into kernel logs.
Summary
What happened
Out-of-bounds read in Linux F2FS recovery logging allows local users to expose raw inode fields through a 255-byte filename. recover_inode() and recover_dentry() pass the non-NUL-terminated i_name buffer to %s, so logging continues beyond its stored length. Triggering the read requires roll-forward recovery of an F2FS inode with a maximum-length name, and the bounded consequence is disclosure into kernel logs.
The record
- CVE
- CVE-2026-89838
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.11
- Affected versionversion=f356fe0cba0e3523e538987916bd2acedd4e6f41 <01027b2fcb74dade59fb833b51023f6593b6a9a2
- Affected versionversion=f356fe0cba0e3523e538987916bd2acedd4e6f41 <317d32e1a8deaf1c01c388badc667334c39e62ca
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo