Service interruption via incorrect ring-buffer page deallocation
Published Aug 22, 2026 · Updated Aug 22, 2026
Incorrect memory deallocation in the Linux kernel allows attackers to disrupt service when oversized trace sub-buffers are freed. rb_allocate_cpu_buffer() leaves the reader page's bpage->order at zero instead of recording buffer::subbuf_order, so free_buffer_page() releases an allocation using the wrong page order. Reachability requires a ring buffer with sub-buffers larger than PAGE_SIZE to be created and later freed; published material identifies no attacker privilege or delivery path.
Summary
What happened
Incorrect memory deallocation in the Linux kernel allows attackers to disrupt service when oversized trace sub-buffers are freed. rb_allocate_cpu_buffer() leaves the reader page's bpage->order at zero instead of recording buffer::subbuf_order, so free_buffer_page() releases an allocation using the wrong page order. Reachability requires a ring buffer with sub-buffers larger than PAGE_SIZE to be created and later freed; published material identifies no attacker privilege or delivery path.
The record
- CVE
- CVE-2026-74602
- Published
- Aug 22, 2026
- Updated
- Aug 22, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-665, T1499
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 22, 2026CVE publishedPublication date reported by the CVE source.
- Aug 22, 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=6.8
- Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <2e37f2bf111429fbfa4d985b12df3ba496ca70aa
- Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <3b3e0a6ee5bb3ac000f135beef26b2b7ed1a771a
- Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <6d014e44b68ddd43f71288d2a4dbb1a259869149
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.
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