Kernel memory corruption via mutable packet headers
Published Aug 8, 2023 · Updated Aug 2, 2024
TOCTOU race in the Qualcomm Snapdragon camera kernel driver allows local users to cause out-of-bounds reads and writes via shared buffers. cam_mem_get_cpu_buf() returns a buffer that remains writable from user space after the kernel validates its packet header, so header.count can change before the checked value is used. Exploitation requires local high privileges and winning the race, enabling kernel-memory disclosure or corruption without user interaction.
Summary
What happened
TOCTOU race in the Qualcomm Snapdragon camera kernel driver allows local users to cause out-of-bounds reads and writes via shared buffers. cam_mem_get_cpu_buf() returns a buffer that remains writable from user space after the kernel validates its packet header, so header.count can change before the checked value is used. Exploitation requires local high privileges and winning the race, enabling kernel-memory disclosure or corruption without user interaction.
The record
- CVE
- CVE-2023-28576
- Published
- Aug 8, 2023
- Updated
- Aug 2, 2024
- Vendor
- Qualcomm
- Product
- Snapdragon
- Classifications
- CWE-367, CAPEC-29
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Aug 8, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record 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=FastConnect 6800
- Affected versionversion=FastConnect 6900
- Affected versionversion=FastConnect 7800
- Affected versionversion=QCA6391
- Affected versionversion=QCA6426
- Affected versionversion=QCA6436
- Affected versionversion=QCN9074
- Affected versionversion=QCS410
- Affected versionversion=QCS610
- Affected versionversion=SD865 5G
- Affected versionversion=Snapdragon 865 5G Mobile Platform
- Affected versionversion=Snapdragon 865+ 5G Mobile Platform (SM8250-AB)
- Affected versionversion=Snapdragon 870 5G Mobile Platform (SM8250-AC)
- Affected versionversion=Snapdragon 8 Gen 1 Mobile Platform
- Affected versionversion=Snapdragon X55 5G Modem-RF System
- Affected versionversion=Snapdragon XR2 5G Platform
- Affected versionversion=SW5100
- Affected versionversion=SW5100P
- Affected versionversion=SXR2130
- Affected versionversion=WCD9341
- Affected versionversion=WCD9370
- Affected versionversion=WCD9380
- Affected versionversion=WCN3660B
- Affected versionversion=WCN3680B
- Affected versionversion=WCN3950
- Affected versionversion=WCN3980
- Affected versionversion=WCN3988
- Affected versionversion=WSA8810
- Affected versionversion=WSA8815
- Affected versionversion=WSA8830
- Affected versionversion=WSA8835
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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