Out-of-bounds kernel access via mismatched bucket algorithms
Published Jun 24, 2026 · Updated Jun 24, 2026
Out-of-bounds access in Linux Kernel libceph allows remote attackers to corrupt kernel memory via a malformed Ceph OSD map. crush_decode() allocates a bucket using the outer alg field but processes and destroys it according to the unchecked inner b->alg field. Reachability requires an affected host to use the kernel Ceph client and accept the crafted map; Red Hat instead assesses a local, low-privileged, availability-only path.
Summary
What happened
Out-of-bounds access in Linux Kernel libceph allows remote attackers to corrupt kernel memory via a malformed Ceph OSD map. crush_decode() allocates a bucket using the outer alg field but processes and destroys it according to the unchecked inner b->alg field. Reachability requires an affected host to use the kernel Ceph client and accept the crafted map; Red Hat instead assesses a local, low-privileged, availability-only path.
The record
- CVE
- CVE-2026-52955
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, CWE-131
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 24, 2026CVE publishedPublication date reported by the CVE source.
- Jun 24, 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 <6.12.91
- Affected versionversion=0 <6.18.33
- Affected versionversion=0 <6.6.141
- Affected versionversion=0 <7.0.10
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0f3604cbe4df14c5e58288ac9f57511e726a222d
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3f42508191e129ee6b5ea96578d5cab14f2a013a
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4c79fc2d598694bda845b46229c9d48b65042970
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e70ef53e818c53eab28d7b0026b7fd03dddaba5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea0d42137f0c06da71e37ffc647aab4c5309599a
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ebe76d58a48a48031b98543d86c4cd30a825b622
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fb176a99e4c1a5a8448a83d83d3606203ba81faa
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.
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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