Kernel-memory disclosure via malformed BTF DATASEC name
Published Sep 18, 2024 · Updated Aug 5, 2026
Out-of-bounds read in the BPF type format validator in Linux 6.9 through 6.10.9 allows local users to disclose kernel memory via crafted BTF data. The btf_name_valid_section() function advances past a one-byte NUL DATASEC name before checking characters, scans beyond the allocation, and incorrectly accepts the empty name. A local account able to invoke BPF_BTF_LOAD with CAP_BPF can use the validation result as a memory oracle or force a kernel oops without interaction from another user.
Summary
What happened
Out-of-bounds read in the BPF type format validator in Linux 6.9 through 6.10.9 allows local users to disclose kernel memory via crafted BTF data. The btf_name_valid_section() function advances past a one-byte NUL DATASEC name before checking characters, scans beyond the allocation, and incorrectly accepts the empty name. A local account able to invoke BPF_BTF_LOAD with CAP_BPF can use the validation result as a memory oracle or force a kernel oops without interaction from another user.
The record
- CVE
- CVE-2024-46764
- Published
- Sep 18, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 18, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=6.9
- Affected versionversion=bd70a8fb7ca4fcb078086f4d96b048aaf1aa4786 <bb6705c3f93bed2af03d43691743d4c43e3c8e6f
- Affected versionversion=bd70a8fb7ca4fcb078086f4d96b048aaf1aa4786 <c8ffe2d4d37a05ce18c71b87421443c16f8475e5
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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