Service interruption via undersized Ceph authentication reply
Published Jun 24, 2026 · Updated Jun 24, 2026
Out-of-bounds read in Linux Kernel before 7.0.10 allows remote attackers to interrupt Ceph clients via a crafted authentication reply. The __ceph_x_decrypt() function casts decrypted plaintext as a ceph_x_encrypt_header and reads hdr->magic without requiring enough bytes for that structure. A client must process an undersized FRAME_TAG_AUTH_REPLY_MORE ciphertext from a Ceph peer; the failure mode is unspecified beyond loss of availability.
Summary
What happened
Out-of-bounds read in Linux Kernel before 7.0.10 allows remote attackers to interrupt Ceph clients via a crafted authentication reply. The __ceph_x_decrypt() function casts decrypted plaintext as a ceph_x_encrypt_header and reads hdr->magic without requiring enough bytes for that structure. A client must process an undersized FRAME_TAG_AUTH_REPLY_MORE ciphertext from a Ceph peer; the failure mode is unspecified beyond loss of availability.
The record
- CVE
- CVE-2026-52956
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1499
- 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 <7.0.10
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <821365487aa58d06bda65c676ba215d506ba9768
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2
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
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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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