Kernel memory leak via unreleased WMI output
Published Jul 19, 2026 · Updated Jul 19, 2026
Memory leak in Linux Kernel 6.17 lenovo-wmi-helpers allows attackers to consume kernel memory via an unspecified call path. lwmi_dev_evaluate_int() leaves output.pointer outside the cleanup-managed ret_obj when retval is NULL, so the ACPI output allocation is never freed. Reachability requires that internal NULL-result path on systems using the Lenovo WMI helper; public records show a lost allocation but no demonstrated crash, privilege gain, or data exposure.
Summary
What happened
Memory leak in Linux Kernel 6.17 lenovo-wmi-helpers allows attackers to consume kernel memory via an unspecified call path. lwmi_dev_evaluate_int() leaves output.pointer outside the cleanup-managed ret_obj when retval is NULL, so the ACPI output allocation is never freed. Reachability requires that internal NULL-result path on systems using the Lenovo WMI helper; public records show a lost allocation but no demonstrated crash, privilege gain, or data exposure.
The record
- CVE
- CVE-2026-63839
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 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=6.17
- Affected versionversion=e521d16e76cd9ea99c585e064f4e7daf657b1451 <0c3887a134f191723b53e2a47e501b534c8723ee
- Affected versionversion=e521d16e76cd9ea99c585e064f4e7daf657b1451 <40a984dd0602e238ad893b167751620e751d1199
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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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
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Technologies
Your stack
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Your stack
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