Kernel stack disclosure via uninitialized scan padding
Published Jul 19, 2026 · Updated Jul 19, 2026
Information disclosure in Linux Kernel 6.15 through 6.18.34 and 7.0 through 7.0.11 allows local users to read kernel stack data. In adis16550_trigger_handler(), memcpy fills 28 bytes, but the aligned timestamp starts at offset 32, so each triggered scan returns four uninitialized stack bytes. Exposure requires an ADIS16550 IIO device and permission to consume its triggered scan buffer; the reported consequence is limited to disclosure.
Summary
What happened
Information disclosure in Linux Kernel 6.15 through 6.18.34 and 7.0 through 7.0.11 allows local users to read kernel stack data. In adis16550_trigger_handler(), memcpy fills 28 bytes, but the aligned timestamp starts at offset 32, so each triggered scan returns four uninitialized stack bytes. Exposure requires an ADIS16550 IIO device and permission to consume its triggered scan buffer; the reported consequence is limited to disclosure.
The record
- CVE
- CVE-2026-63966
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
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=6.15
- Affected versionversion=e4570f4bb231f01e32d44fd38841665f340d6914 <474f8928d50b09f7dcf507049f08732640b88b49
- Affected versionversion=e4570f4bb231f01e32d44fd38841665f340d6914 <c2c255444392872cbbf46d640cb3a938e8000309
- Affected versionversion=e4570f4bb231f01e32d44fd38841665f340d6914 <ce582b22dd2ff15ac99101c22ec1559d1febe2ff
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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