VulnerabilityPublished 19 Jul 2026Updated 7 Sep 2026

CVE-2026-63839: Linux kernel · platform/x86: lenovo-wmi-helpers: Fix memory leak in lwmi_dev_evaluate_int()

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 12 Nov 2026, 17:36 UTC

Severity

Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

A fix has been applied to the Linux kernel to address this memory leak. Users should update to the fixed kernel version once available. Since this is a memory leak fix with no functional changes, applying the official patch is the recommended mitigation.

Description

A memory leak vulnerability was identified and fixed in the Linux kernel's lenovo-wmi-helpers component, specifically in the lwmi_dev_evaluate_int() function. The issue involved leaking output.pointer when retval was NULL. The fix ensures that the allocated memory is properly freed, preventing the leak. No functional changes to the kernel behavior were intended by this fix.

Impact

The vulnerability causes a memory leak in the kernel module, which could lead to increased memory usage over time. There is no indication of direct functional impact or exploitation in the wild. The leak may affect system stability or resource availability if triggered repeatedly.

Summary

CVE-2026-63839 addresses a memory leak in the Linux kernel's platform/x86 lenovo-wmi-helpers module. The function lwmi_dev_evaluate_int() improperly leaked memory by not freeing output.pointer when retval was NULL. The patch moves the assignment of ret_obj outside the conditional block so that the __free cleanup callback always frees the allocated memory. This resolves the leak without altering kernel functionality.

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 12 Nov 2026, 17:36 UTC

Technical details

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