Kernel crash via oversized OSDMap list decoding
Published Aug 10, 2026 · Updated Aug 10, 2026
Stack out-of-bounds write in Linux libceph allows remote attackers controlling a Ceph monitor to crash connected kernel clients. __decode_pg_temp() and __decode_pg_upmap_items() accept OSDMap list lengths above 32, and later copies overrun ceph_osds.osds on the stack. Exploitation requires a compromised or attacker-controlled Ceph monitor and an active RBD, CephFS, or libceph client; the demonstrated outcome is a kernel BUG or panic.
Summary
What happened
Stack out-of-bounds write in Linux libceph allows remote attackers controlling a Ceph monitor to crash connected kernel clients. __decode_pg_temp() and __decode_pg_upmap_items() accept OSDMap list lengths above 32, and later copies overrun ceph_osds.osds on the stack. Exploitation requires a compromised or attacker-controlled Ceph monitor and an active RBD, CephFS, or libceph client; the demonstrated outcome is a kernel BUG or panic.
The record
- CVE
- CVE-2026-68159
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1203
- Attack vector
- network
- Privileges
- unauthenticated
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?
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- Affected versionversion=4.13
- Affected versionversion=a303bb0e58345fe9f7ab2f82b90266f2b5036058 <9f00f9cf2be293efe899db67dc5272e3a9c62717
- Affected versionversion=a303bb0e58345fe9f7ab2f82b90266f2b5036058 <e36663145abd7024f0281dfb22fdef65f185845b
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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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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