Service interruption via signed buffer-length conversion
Published Sep 16, 2025 · Updated Sep 16, 2025
Integer conversion in io_uring buffer commitment in Linux 6.15 through 6.16.4 allows local users to interrupt service via a large buffer. The buffer-commit path converts unsigned buf->len into a signed int while calculating this_len, so sufficiently large lengths are interpreted as negative. Local low-privileged access is required, and the published assessment limits the consequence to availability without confidentiality or integrity loss.
Summary
What happened
Integer conversion in io_uring buffer commitment in Linux 6.15 through 6.16.4 allows local users to interrupt service via a large buffer. The buffer-commit path converts unsigned buf->len into a signed int while calculating this_len, so sufficiently large lengths are interpreted as negative. Local low-privileged access is required, and the published assessment limits the consequence to availability without confidentiality or integrity loss.
The record
- CVE
- CVE-2025-39822
- Published
- Sep 16, 2025
- Updated
- Sep 16, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 16, 2025CVE publishedPublication date reported by the CVE source.
- Sep 16, 2025Record 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=6.12
- Affected versionversion=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <c64eff368ac676e8540344d27a3de47e0ad90d21
- Affected versionversion=ae98dbf43d755b4e111fcd086e53939bef3e9a1a <f4f411c068402c370c4f9a9d4950a97af97bbbb1
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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