Kernel memory corruption via unchecked SMB compression length
Published Mar 25, 2026 · Updated Mar 25, 2026
An out-of-bounds write in macOS before 14.8.5, before 15.7.5, and before 26.4 allows remote attackers to corrupt kernel memory via SMB. The smb2_rq_decompress_read parser copies an attacker-controlled compressed length into an OriginalCompressedSegmentSize-based kernel buffer without checking that the copy fits. Mounting an attacker-controlled share, including through an smb:// link, reaches the flaw under a default configuration; a public trigger reliably panics the kernel, while Apple reports protected-file modification.
Summary
What happened
An out-of-bounds write in macOS before 14.8.5, before 15.7.5, and before 26.4 allows remote attackers to corrupt kernel memory via SMB. The smb2_rq_decompress_read parser copies an attacker-controlled compressed length into an OriginalCompressedSegmentSize-based kernel buffer without checking that the copy fits. Mounting an attacker-controlled share, including through an smb:// link, reaches the flaw under a default configuration; a public trigger reliably panics the kernel, while Apple reports protected-file modification.
The record
- CVE
- CVE-2026-28825
- Published
- Mar 25, 2026
- Updated
- Mar 25, 2026
- Vendor
- Apple
- Product
- macOS
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 25, 2026CVE publishedPublication date reported by the CVE source.
- Mar 25, 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 <14.8.5
- Affected versionversion=0 <15.7.5
- Affected versionversion=0 <26.4
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
- Calif SMB server triggerfunctional · demonstrated
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