Kernel-memory disclosure and crash via auth reply length
Published May 28, 2026 · Updated May 28, 2026
Out-of-bounds reads in Linux Kernel libceph allow remote attackers to disclose kernel memory or crash Ceph clients via crafted auth replies. ceph_handle_auth_reply() passes a positive result value as the CEPH_MSG_AUTH front length, so the send path reads and transmits bytes past its allocation. A malicious Ceph monitor or a man-in-the-middle attacker can trigger the pre-authentication path when an existing CephFS mount or RBD map connects or reauthenticates, exposing kernel heap data and causing a kernel crash.
Summary
What happened
Out-of-bounds reads in Linux Kernel libceph allow remote attackers to disclose kernel memory or crash Ceph clients via crafted auth replies. ceph_handle_auth_reply() passes a positive result value as the CEPH_MSG_AUTH front length, so the send path reads and transmits bytes past its allocation. A malicious Ceph monitor or a man-in-the-middle attacker can trigger the pre-authentication path when an existing CephFS mount or RBD map connects or reauthenticates, exposing kernel heap data and causing a kernel crash.
The record
- CVE
- CVE-2026-46119
- Published
- May 28, 2026
- Updated
- May 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 28, 2026CVE publishedPublication date reported by the CVE source.
- May 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
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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 <6.12.88
- Affected versionversion=0 <6.18.30
- Affected versionversion=0 <6.6.140
- Affected versionversion=0 <7.0.7
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1c439de70b1c3eb3c6bffa8245c16b9fc318f114
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ae0afd98432536562fa8261538ae795446f0589
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <408e85ee708b6aa03eeb0220ffa0915f4d407181
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8517b6c8d2c759918ba0058cb6c7e14d59643202
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b7df9fbd4869fdfe09a3f501ffd228486521e062
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What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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