Kernel stack disclosure via uninitialized FIFO padding
Published Jul 19, 2026 · Updated Jul 19, 2026
Information disclosure in Linux Kernel 5.10 allows local users to read kernel stack data through the st_lsm6dsx IIO interface. The tagged FIFO path copies a six-byte sample from an uninitialized, eight-byte-aligned iio_buff stack structure, exposing padding bytes before its timestamp. Reachability requires a supported STMicroelectronics IMU using tagged FIFO buffering and local access to the device's IIO data stream.
Summary
What happened
Information disclosure in Linux Kernel 5.10 allows local users to read kernel stack data through the st_lsm6dsx IIO interface. The tagged FIFO path copies a six-byte sample from an uninitialized, eight-byte-aligned iio_buff stack structure, exposing padding bytes before its timestamp. Reachability requires a supported STMicroelectronics IMU using tagged FIFO buffering and local access to the device's IIO data stream.
The record
- CVE
- CVE-2026-63967
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.10
- Affected versionversion=5.9.5 <5.10
- Affected versionversion=a42ca3b182ccb766666a0be1053921cba190e2de
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <3147b303b8c7d9f91da4b849ece33b45048f5eaf
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <890d0312d5f94be43eac21f5a34d3bccc60d051b
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <babf1943a40bb5669db57d30ca16c22504b18e07
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <c9d8e9adaa63150ef7e833480b799d0bab83a276
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <d42ac0bfb6a16617c62a59d53706579c7fadbfa6
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <e6bb3a49c5f9de870ea95e69775df785728e3366
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <fe1a7f99e72ebd2880515332b79b8c256be22aca
- Affected versionversion=c14edb4d0bdc53f969ea84c7f384472c28b1a9f8 <ff8d3c088b77b11782f2c3b97e37425be050e8de
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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