CVE-2025-37922: Linux kernel · book3s64/radix : Align section vmemmap start address to PAGE_SIZE
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 5 Nov 2026, 22:03 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 20 May 2025
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 5 Nov 2026.
What to do
AI-suggested
A fix is available that aligns the vmemmap section start address to PAGE_SIZE, preventing improper sharing of altmap pages between namespaces and avoiding kernel crashes. Users should apply the official Linux kernel patch that addresses this issue. No additional mitigations are indicated.
Description
CVE-2025-37922 is a Linux kernel vulnerability in the book3s64/radix memory management subsystem. It involves improper alignment of the vmemmap section start address, which can cause altmap pages to be shared incorrectly between namespaces. This leads to a kernel crash due to double freeing of pages. The issue is resolved by aligning the vmemmap start address to PAGE_SIZE, ensuring proper allocation and freeing of pages.
References
- git.kernel.org/stable/c/9a8d4d7072d4df108479b1adc4b0840e96f6f61d (opens in a new tab)
- git.kernel.org/stable/c/7f5476d80f2cb364701cd1fa138a14b241ca99e9 (opens in a new tab)
- git.kernel.org/stable/c/400be767deaf31a073c6d14c5d151ae5ac2a60e2 (opens in a new tab)
- git.kernel.org/stable/c/9cf7e13fecbab0894f6986fc6986ab2eba8de52e (opens in a new tab)