Kernel stack disclosure via unchecked VDO count
Published Jul 19, 2026 · Updated Jul 19, 2026
Information disclosure in the Linux Kernel USB Type-C DisplayPort alternate mode allows physically proximate attackers to read kernel stack data. The DisplayPort alternate-mode VDM handler accepts a Status Update VDO without requiring the expected object count, then reads and transmits bytes from an incompletely initialized stack buffer. Exploitation requires a connected malicious or malfunctioning USB-C DisplayPort device; the upstream record establishes stack-data disclosure but no data modification.
Summary
What happened
Information disclosure in the Linux Kernel USB Type-C DisplayPort alternate mode allows physically proximate attackers to read kernel stack data. The DisplayPort alternate-mode VDM handler accepts a Status Update VDO without requiring the expected object count, then reads and transmits bytes from an incompletely initialized stack buffer. Exploitation requires a connected malicious or malfunctioning USB-C DisplayPort device; the upstream record establishes stack-data disclosure but no data modification.
The record
- CVE
- CVE-2026-63961
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1200
- Attack vector
- physical
- Privileges
- unauthenticated
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=0 <5.10.259
- Affected versionversion=0 <5.15.210
- Affected versionversion=0 <6.1.176
- Affected versionversion=0 <6.12.93
- Affected versionversion=0 <6.18.35
- Affected versionversion=0 <6.6.143
- Affected versionversion=0 <7.0.12
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <64bd6ccc5799f8473d1f37d4d8f53093dfec5c02
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ffdbcd7a02f3af8fff9b6519830369f574ed44c
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <70e7045849e954e56dcbf441b6330e66bc996306
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74aabe9ea30fdfba924fce9594e6aa69a596a4bb
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <77a759ec30bc5fb0dd9c867b711d0acfed6c7faa
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a18f896e667df491331371b55d4ad644dc51d60
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b10eff5abe6aa2a5af10ed17bddff76e3b6e6b9b
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dd7118c010f324497c275e8fd7a35c9baaa2a00f
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
Public exploit references
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Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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