Kernel memory exposure via unchecked libceph decodes
Published Aug 8, 2026 · Updated Aug 8, 2026
Out-of-bounds reads in Linux libceph allow remote attackers controlling a Ceph OSD to expose kernel memory via a crafted lock reply. The decode_lockers() function reads num_lockers and type beyond the validated reply boundary, then uses them for allocation sizing and lock-type selection. A kernel RBD client must connect to a malicious or compromised cluster and issue lock.get_info; malformed counts can also cause memory pressure or corrupt lock handling.
Summary
What happened
Out-of-bounds reads in Linux libceph allow remote attackers controlling a Ceph OSD to expose kernel memory via a crafted lock reply. The decode_lockers() function reads num_lockers and type beyond the validated reply boundary, then uses them for allocation sizing and lock-type selection. A kernel RBD client must connect to a malicious or compromised cluster and issue lock.get_info; malformed counts can also cause memory pressure or corrupt lock handling.
The record
- CVE
- CVE-2026-68082
- Published
- Aug 8, 2026
- Updated
- Aug 8, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 8, 2026CVE publishedPublication date reported by the CVE source.
- Aug 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=4.9
- Affected versionversion=d4ed4a530562881cc5225050e42d96034f405aae <a109a556115271ca7896dcda7b4b7e45e156c227
- Affected versionversion=d4ed4a530562881cc5225050e42d96034f405aae <a54be593d0b749161b08a1e56189b2cb9114267a
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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