Local process memory corruption via undersized header check
Published Jul 25, 2026 · Updated Jul 25, 2026
Out-of-bounds write in affected Linux Kernel releases allows local users to corrupt process memory through an iommufd vEVENT read. The iommufd_veventq_fops_read() bound check measures the hdr pointer rather than the eight-byte header, then copies the full header and payload past a short userspace buffer. The path requires a locally held vEVENTQ descriptor on a 32-bit kernel; the four-byte overwrite allows a consumer crash or control-flow hijack, while current 64-bit builds are unaffected.
Summary
What happened
Out-of-bounds write in affected Linux Kernel releases allows local users to corrupt process memory through an iommufd vEVENT read. The iommufd_veventq_fops_read() bound check measures the hdr pointer rather than the eight-byte header, then copies the full header and payload past a short userspace buffer. The path requires a locally held vEVENTQ descriptor on a 32-bit kernel; the four-byte overwrite allows a consumer crash or control-flow hijack, while current 64-bit builds are unaffected.
The record
- CVE
- CVE-2026-64293
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.15
- Affected versionversion=e36ba5ab808ef6237c3148d469c8238674230e2b <04a177f91160ee18da98f5689482cf0f589ec869
- Affected versionversion=e36ba5ab808ef6237c3148d469c8238674230e2b <0cdbb97a4dbd69abdd2ab998b4fbc7803d4b0b72
- Affected versionversion=e36ba5ab808ef6237c3148d469c8238674230e2b <be93d186ae88a92e7aa77e122d4e661fa57b1e39
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.
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Technologies
Your stack
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Your stack
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