Kernel memory corruption via unbounded DACL deduplication
Published Aug 10, 2026 · Updated Aug 10, 2026
Out-of-bounds access in the Linux ksmbd DACL handler allows remote authenticated users to corrupt kernel memory through crafted SMB requests. When set_ntacl_dacl() stops copying ACEs after size accounting overflows, set_posix_acl_entries_dacl() still uses the original input ACE count and walks beyond the rebuilt DACL into an invalid buffer tail. Exploitation requires an authenticated SMB session, FILE_WRITE_DAC access to plant a crafted NTACL on an ACL-enabled share, and a subsequent security-descriptor query; results include disclosure, incorrect ACL reconstruction, a hang, or a kernel panic.
Summary
What happened
Out-of-bounds access in the Linux ksmbd DACL handler allows remote authenticated users to corrupt kernel memory through crafted SMB requests. When set_ntacl_dacl() stops copying ACEs after size accounting overflows, set_posix_acl_entries_dacl() still uses the original input ACE count and walks beyond the rebuilt DACL into an invalid buffer tail. Exploitation requires an authenticated SMB session, FILE_WRITE_DAC access to plant a crafted NTACL on an ACL-enabled share, and a subsequent security-descriptor query; results include disclosure, incorrect ACL reconstruction, a hang, or a kernel panic.
The record
- CVE
- CVE-2026-68098
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 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 <6.12.101
- Affected versionversion=0 <6.18.42
- Affected versionversion=0 <6.6.148
- Affected versionversion=0 <7.1.6
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <58d97fcd0bf1aee694e244cc28635b9df95b543b
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6d9d7aa4a2c99c31acfa28921c30b684110cf66c
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b057a851129c6a084e7e393b62ca3abf6c2660bc
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1eba60db813ec28732bf18b5f0a67ebac9c3100
What conditions does exploitation require?
What is affected?
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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