Kernel-memory disclosure via uninitialized Btrfs ioctl buffer
Published May 17, 2024 · Updated May 12, 2026
Information disclosure in the Linux Btrfs subsystem allows local users to read kernel heap data through a logical-to-inode ioctl. init_data_container() allocates a 64 KiB btrfs_data_container with kvmalloc(), and btrfs_ioctl_logical_to_ino() copies uninitialized bytes to user space. Low-privileged local access and a Btrfs filesystem are required; the demonstrated consequence is disclosure of residual kernel-memory contents.
Summary
What happened
Information disclosure in the Linux Btrfs subsystem allows local users to read kernel heap data through a logical-to-inode ioctl. init_data_container() allocates a 64 KiB btrfs_data_container with kvmalloc(), and btrfs_ioctl_logical_to_ino() copies uninitialized bytes to user space. Low-privileged local access and a Btrfs filesystem are required; the demonstrated consequence is disclosure of residual kernel-memory contents.
The record
- CVE
- CVE-2024-35849
- Published
- May 17, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-908, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 17, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 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=0 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
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