ftrace warnings via page-capacity undercount
Published Feb 4, 2026 · Updated Feb 4, 2026
Memory over-allocation in Linux Kernel 6.15 through 6.18.6 allows attackers to trigger ftrace warnings via unspecified vectors. ftrace_process_locs() undercounts page-group capacity by multiplying truncated ENTRIES_PER_PAGE by 2^order, while ftrace_allocate_records() can allocate too many pages. The condition requires a page size not divisible by the 24-byte entry size and a high-order allocation; the published record reports excess pages and WARN conditions, but no attacker privilege or reachability gate.
Summary
What happened
Memory over-allocation in Linux Kernel 6.15 through 6.18.6 allows attackers to trigger ftrace warnings via unspecified vectors. ftrace_process_locs() undercounts page-group capacity by multiplying truncated ENTRIES_PER_PAGE by 2^order, while ftrace_allocate_records() can allocate too many pages. The condition requires a page size not divisible by the 24-byte entry size and a high-order allocation; the published record reports excess pages and WARN conditions, but no attacker privilege or reachability gate.
The record
- CVE
- CVE-2026-23052
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 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=4a3efc6baff931da9a85c6d2e42c87bd9a827399 <9aef476717994e96dadfb359641c4b82b521aa36
- Affected versionversion=4a3efc6baff931da9a85c6d2e42c87bd9a827399 <be55257fab181b93af38f8c4b1b3cb453a78d742
- Affected versionversion=6.15
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Weakness, pattern, technique
No sourced classifications are available.
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