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CVE-2025-38688
iommufd: Prevent ALIGN() overflow
Description

In the Linux kernel, the following vulnerability has been resolved: iommufd: Prevent ALIGN() overflow When allocating IOVA the candidate range gets aligned to the target alignment. If the range is close to ULONG_MAX then the ALIGN() can wrap resulting in a corrupted iova. Open code the ALIGN() using get_add_overflow() to prevent this. This simplifies the checks as we don't need to check for length earlier either. Consolidate the two copies of this code under a single helper. This bug would allow userspace to create a mapping that overlaps with some other mapping or a reserved range.

INFO

Published Date :

Sept. 4, 2025, 4:15 p.m.

Last Modified :

Sept. 5, 2025, 5:47 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-38688 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Fix kernel memory allocation alignment issues to prevent mapping overlaps.
  • Update the Linux kernel to the latest version.
  • Apply the "iommufd: Prevent ALIGN() overflow" patch.
  • Rebuild and reinstall the kernel if necessary.
  • Verify system stability and security after update.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-38688.

URL Resource
https://git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2
https://git.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436b
https://git.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeef
https://git.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537
https://git.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-38688 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-38688 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-38688 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-38688 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: iommufd: Prevent ALIGN() overflow When allocating IOVA the candidate range gets aligned to the target alignment. If the range is close to ULONG_MAX then the ALIGN() can wrap resulting in a corrupted iova. Open code the ALIGN() using get_add_overflow() to prevent this. This simplifies the checks as we don't need to check for length earlier either. Consolidate the two copies of this code under a single helper. This bug would allow userspace to create a mapping that overlaps with some other mapping or a reserved range.
    Added Reference https://git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2
    Added Reference https://git.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436b
    Added Reference https://git.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeef
    Added Reference https://git.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537
    Added Reference https://git.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.