Local kernel-memory consumption via Ceph buffer leak
Published Jun 24, 2026 · Updated Jun 24, 2026
Resource leakage in the CephFS xattr handler in affected Linux Kernel branches allows local users to consume kernel memory via retries. During a retry in __ceph_setxattr(), old_blob can retain ci->i_xattrs.prealloc_blob, but the function omits ceph_buffer_put() and leaks the reference. Reachability requires local access to a mounted CephFS and the retry path; the published mechanism does not establish a specific crash mode.
Summary
What happened
Resource leakage in the CephFS xattr handler in affected Linux Kernel branches allows local users to consume kernel memory via retries. During a retry in __ceph_setxattr(), old_blob can retain ci->i_xattrs.prealloc_blob, but the function omits ceph_buffer_put() and leaks the reference. Reachability requires local access to a mounted CephFS and the retry path; the published mechanism does not establish a specific crash mode.
The record
- CVE
- CVE-2026-52962
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-787, T1499
- Attack vector
- local
- Privileges
- authenticated
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
Compare your product and version with the public record. A matching version still requires validation against your environment.
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 <3fa13ceefbc5f36131110342743994cb3de80637
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4bfdcefdaa6092a06cacd59389c7756b36e6de8c
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <521e5aba857fd267624892c8dd6295f22ce0267e
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d3cc36b4e77a27ce7b686b7c59c7072bcb3fa8e
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d3e8d2d648d5f0df29b4710246680f47695fe94
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bc7abce4460e490dcb579eec770f175b150b685f
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0cb994605c84a159c1d00d72cdc8583c321ef95
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ecf94823c5c6a20790bb76ed2816822b0beb0c22
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo