Memory disclosure and corruption via negative offsets
Published Aug 7, 2026 · Updated Aug 7, 2026
Out-of-bounds access in Zephyr RTOS 4.3.0 through 4.4.1 allows local users to disclose memory and corrupt flash via negative offsets. The SF32LB MPI QSPI NOR driver's read and write paths add a signed offset to an unsigned size, so negative values wrap past the bounds check and address memory outside the mapped flash window. Exploitation requires CONFIG_USERSPACE and an unprivileged thread granted access to the raw flash device; reads expose CPU-addressable memory, while writes can damage flash or interrupt service.
Summary
What happened
Out-of-bounds access in Zephyr RTOS 4.3.0 through 4.4.1 allows local users to disclose memory and corrupt flash via negative offsets. The SF32LB MPI QSPI NOR driver's read and write paths add a signed offset to an unsigned size, so negative values wrap past the bounds check and address memory outside the mapped flash window. Exploitation requires CONFIG_USERSPACE and an unprivileged thread granted access to the raw flash device; reads expose CPU-addressable memory, while writes can damage flash or interrupt service.
The record
- CVE
- CVE-2026-11743
- Published
- Aug 7, 2026
- Updated
- Aug 7, 2026
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-125, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 7, 2026CVE publishedPublication date reported by the CVE source.
- Aug 7, 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=4.3.0 <4.4.2
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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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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