U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-37949 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: xenbus: Use kref to track req lifetime Marek reported seeing a NULL pointer fault in the xenbus_thread callstack: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: e030:__wake_up_common+0x4c/0x180 Call Trace: <TASK> __wake_up_common_lock+0x82/0xd0 process_msg+0x18e/0x2f0 xenbus_thread+0x165/0x1c0 process_msg+0x18e is req->cb(req). req->cb is set to xs_wake_up(), a thin wrapper around wake_up(), or xenbus_dev_queue_reply(). It seems like it was xs_wake_up() in this case. It seems like req may have woken up the xs_wait_for_reply(), which kfree()ed the req. When xenbus_thread resumes, it faults on the zero-ed data. Linux Device Drivers 2nd edition states: "Normally, a wake_up call can cause an immediate reschedule to happen, meaning that other processes might run before wake_up returns." ... which would match the behaviour observed. Change to keeping two krefs on each request. One for the caller, and one for xenbus_thread. Each will kref_put() when finished, and the last will free it. This use of kref matches the description in Documentation/core-api/kref.rst


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0e94a246bb6d9538010b6c02d2b1d4717a97b2e5 kernel.org Patch 
https://git.kernel.org/stable/c/1f0304dfd9d217c2f8b04a9ef4b3258a66eedd27 kernel.org Patch 
https://git.kernel.org/stable/c/2466b0f66795c3c426cacc8998499f38031dbb59 kernel.org Patch 
https://git.kernel.org/stable/c/4d260a5558df4650eb87bc41b2c9ac2d6b2ba447 kernel.org Patch 
https://git.kernel.org/stable/c/8b02f85e84dc6f7c150cef40ddb69af5a25659e5 kernel.org Patch 
https://git.kernel.org/stable/c/8e9c8a0393b5f85f1820c565ab8105660f4e8f92 kernel.org Patch 
https://git.kernel.org/stable/c/cbfaf46b88a4c01b64c4186cdccd766c19ae644c kernel.org Patch 
https://git.kernel.org/stable/c/f1bcac367bc95631afbb918348f30dec887d0e1b kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html CVE Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html CVE Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-37949
NVD Published Date:
05/20/2025
NVD Last Modified:
12/17/2025
Source:
kernel.org