Kernel memory disclosure and crash via SQE misvalidation
Published May 8, 2026 · Updated May 8, 2026
Out-of-bounds read in Linux Kernel allows local users to disclose kernel memory or crash the system via a crafted io_uring SQE. In io_init_req(), the 128-byte SQE check validates the logical queue head instead of the physical index selected through sq_array, so io_uring_cmd_sqe_copy() reads 64 bytes beyond the final SQE slot. Affected releases begin at 6.19; reachability requires IORING_SETUP_SQE_MIXED without IORING_SETUP_NO_SQARRAY and a 128-byte operation, but no race or elevated privilege is required.
Summary
What happened
Out-of-bounds read in Linux Kernel allows local users to disclose kernel memory or crash the system via a crafted io_uring SQE. In io_init_req(), the 128-byte SQE check validates the logical queue head instead of the physical index selected through sq_array, so io_uring_cmd_sqe_copy() reads 64 bytes beyond the final SQE slot. Affected releases begin at 6.19; reachability requires IORING_SETUP_SQE_MIXED without IORING_SETUP_NO_SQARRAY and a 128-byte operation, but no race or elevated privilege is required.
The record
- CVE
- CVE-2026-43442
- Published
- May 8, 2026
- Updated
- May 8, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 8, 2026CVE publishedPublication date reported by the CVE source.
- May 8, 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=1cba30bf9fdd6c982708f3587f609a30c370d889 <1f794f9bed3e5cf7250a3b4daf112a72ed1513e9
- Affected versionversion=1cba30bf9fdd6c982708f3587f609a30c370d889 <6f02c6b196036dbb6defb4647d8707d29b7fe95b
- Affected versionversion=6.19
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- sqe_mixed_oob_v2.cproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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