Kernel memory corruption via unchecked pointer alignment
Published Jun 8, 2026 · Updated Jun 8, 2026
Out-of-bounds write in Linux Kernel device-mapper ioctl processing allows local users with root privileges to corrupt kernel memory. The retrieve_status function aligns outptr to the next eight-byte boundary without rechecking the buffer end, then wrapped remaining-length arithmetic permits a subsequent write beyond the allocation. Only callers with CAP_SYS_ADMIN in the initial user namespace can reach the ioctl, and aligned buffers from common device-mapper libraries do not trigger the condition accidentally.
Summary
What happened
Out-of-bounds write in Linux Kernel device-mapper ioctl processing allows local users with root privileges to corrupt kernel memory. The retrieve_status function aligns outptr to the next eight-byte boundary without rechecking the buffer end, then wrapped remaining-length arithmetic permits a subsequent write beyond the allocation. Only callers with CAP_SYS_ADMIN in the initial user namespace can reach the ioctl, and aligned buffers from common device-mapper libraries do not trigger the condition accidentally.
The record
- CVE
- CVE-2026-46294
- Published
- Jun 8, 2026
- Updated
- Jun 8, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 8, 2026CVE publishedPublication date reported by the CVE source.
- Jun 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=0 <5.10.258
- Affected versionversion=0 <5.15.209
- Affected versionversion=0 <6.1.175
- Affected versionversion=0 <6.12.88
- Affected versionversion=0 <6.18.30
- Affected versionversion=0 <6.6.140
- Affected versionversion=0 <7.0.7
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fa49cc884f6496a915c35621ba4da35649bf159
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <526ff9126a0ae087b65726e1faf31114c718020d
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5af6a879e915ae7bcd83695c316ebb32e1c61bc2
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8daa6c708ef524089ae43f2aed9190acb26d7df8
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8c5311237448f6ffeecc9aec2362e3692623668
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d271631023cbe1cbe7c31a0275ab797883be6e0a
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
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