Local PCI configuration disclosure via caller credentials
Published Sep 24, 2026 · Updated Sep 24, 2026
Improper access control in Linux kernel PCI procfs before listed fixes allows local users to read extended PCI configuration data. proc_bus_pci_read() checks CAP_SYS_ADMIN on the task performing read() instead of file->f_cred captured when the file was opened, allowing the access decision to change with the reader. Exploitation requires a descriptor handoff between processes with different privilege levels; the bounded consequence is disclosure of the device's full PCI configuration space.
Summary
What happened
Improper access control in Linux kernel PCI procfs before listed fixes allows local users to read extended PCI configuration data. proc_bus_pci_read() checks CAP_SYS_ADMIN on the task performing read() instead of file->f_cred captured when the file was opened, allowing the access decision to change with the reader. Exploitation requires a descriptor handoff between processes with different privilege levels; the bounded consequence is disclosure of the device's full PCI configuration space.
The record
- CVE
- CVE-2026-93206
- Published
- Sep 24, 2026
- Updated
- Sep 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 24, 2026CVE publishedPublication date reported by the CVE source.
- Sep 24, 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 <5.10.270
- Affected versionversion=0 <5.15.221
- Affected versionversion=0 <6.1.188
- Affected versionversion=0 <6.12.109
- Affected versionversion=0 <6.18.50
- Affected versionversion=0 <6.6.157
- Affected versionversion=0 <7.2.4
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <53407535d49ec034e476121020b5c878f0d92e18
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5c7ab4ca66f0880cffc3735555ea719dd5253726
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6351e94076329dab517ea94c115e15c4d8459381
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <77272b7fd0e472086fd626a1fcd11da625822cc2
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a3a54aa3e65ed76f8560a387243a7738ae0cb1c
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c2d4174f492458ecdcdef309243624999612d526
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7730acd6a01c5931a3afb83639810ff2fb9cc92
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f82f53e75eff382fc8f56b73279b54f7cf5a5c65
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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