CVE-2026-63953: Linux kernel · mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page
Source GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
AI-suggested
A fix has been implemented to address this vulnerability by adding proper cleanup of allocated page tables in the error path. Users should apply the official Linux kernel updates that include this patch to remediate the issue. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.
Description
A memory leak vulnerability in the Linux kernel was resolved in the memory management code related to device migration. Specifically, when migrate_vma_insert_huge_pmd_page() encounters a PMD check failure and jumps to an error path, the previously allocated page table is not freed, causing a memory leak. The fix adds a label to properly release the allocated page table in the error path.