Kernel-memory disclosure via uninitialized CMMA buffer
Published Aug 15, 2026 · Updated Aug 15, 2026
Information disclosure in Linux 7.0 KVM for s390 allows local users to read stale kernel memory through KVM_S390_GET_CMMA_BITS. kvm_s390_get_cmma_bits() allocates an output buffer with vmalloc(), while the dirty-only DAT walk leaves clean or unmapped gaps unwritten before copy_to_user() returns the full reported span. A low-privileged local user must reach the non-peek CMMA migration path; the resulting exposure is limited to stale bytes present in those buffer gaps.
Summary
What happened
Information disclosure in Linux 7.0 KVM for s390 allows local users to read stale kernel memory through KVM_S390_GET_CMMA_BITS. kvm_s390_get_cmma_bits() allocates an output buffer with vmalloc(), while the dirty-only DAT walk leaves clean or unmapped gaps unwritten before copy_to_user() returns the full reported span. A low-privileged local user must reach the non-peek CMMA migration path; the resulting exposure is limited to stale bytes present in those buffer gaps.
The record
- CVE
- CVE-2026-72292
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-908, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 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=7.0
- Affected versionversion=e38c884df92119d96f652d51f82661dd2fc0b885 <a4a19941ccb2164edc3491faa5ac5df82e94b363
- Affected versionversion=e38c884df92119d96f652d51f82661dd2fc0b885 <c7dda3d0f869dc97223448a06c9a2e5235928e48
What conditions does exploitation require?
What is affected?
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