Kernel-stack disclosure via uncleared Bluetooth socket address
Published Sep 4, 2026 · Updated Sep 4, 2026
Information disclosure in Linux 6.0 and affected descendants allows local users to read kernel-stack bytes through Bluetooth ISO sockets. The iso_sock_getname() function returns the size of a sockaddr_iso without first clearing it, so getsockname() or getpeername() copies unwritten padding and broadcast-address fields from an uninitialized kernel-stack buffer to user space. An unprivileged process can trigger the one-byte padding disclosure; disclosing seven broadcast-peer bytes additionally requires an established BIS or PA connection.
Summary
What happened
Information disclosure in Linux 6.0 and affected descendants allows local users to read kernel-stack bytes through Bluetooth ISO sockets. The iso_sock_getname() function returns the size of a sockaddr_iso without first clearing it, so getsockname() or getpeername() copies unwritten padding and broadcast-address fields from an uninitialized kernel-stack buffer to user space. An unprivileged process can trigger the one-byte padding disclosure; disclosing seven broadcast-peer bytes additionally requires an established BIS or PA connection.
The record
- CVE
- CVE-2026-80761
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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=6.0
- Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <190b719b787eb4ca6c25b12fab224806f9108b06
- Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <1f6d1f2611af0eb36b133a41d29ffd2cc2601615
- Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <884cf2cc957da7ac178a0e6c6c69ddfec0481cc8
- Affected versionversion=ccf74f2390d60a2f9a75ef496d2564abb478f46a <9069be87c67f290783b332c4284e09fb89cb9ea7
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
Public exploit references
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Technologies
Your stack
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Your stack
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