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7.8
HIGH CVSS 3.1
CVE-2025-21762
Linux Kernel ARP RCU Protection UAF Vulnerability
Description

In the Linux kernel, the following vulnerability has been resolved: arp: use RCU protection in arp_xmit() arp_xmit() can be called without RTNL or RCU protection. Use RCU protection to avoid potential UAF.

INFO

Published Date :

Feb. 27, 2025, 3:15 a.m.

Last Modified :

March 21, 2025, 6:02 p.m.

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2025-21762 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
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Update the Linux kernel to a version that includes the RCU protection fix in arp_xmit().
  • Update the Linux kernel to the latest version.
  • Apply the specific patch for arp_xmit RCU protection.
  • Reboot the system after applying the 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-2025-21762.

URL Resource
https://git.kernel.org/stable/c/01d1b5c9abcaff29a43f1d17a19c33eec92c7dbe Patch
https://git.kernel.org/stable/c/10f555e3f573d004ae9d89b3276abb58c4ede5c3 Patch
https://git.kernel.org/stable/c/2c331718d3389b6c5f6855078ab7171849e016bd Patch
https://git.kernel.org/stable/c/307cd1e2d3cb1cbc6c40c679cada6d7168b18431 Patch
https://git.kernel.org/stable/c/a42b69f692165ec39db42d595f4f65a4c8f42e44 Patch
https://git.kernel.org/stable/c/d9366ac2f956a1948b68c0500f84a3462ff2ed8a Patch
https://git.kernel.org/stable/c/e9f4dee534eb1b225b0a120395ad9bc2afe164d3 Patch
https://git.kernel.org/stable/c/f189654459423d4d48bef2d120b4bfba559e6039 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-21762 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-2025-21762 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-2025-21762 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-2025-21762 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.

  • Initial Analysis by [email protected]

    Mar. 21, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.13.4 *cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.79 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.16 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.179 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.4 up to (excluding) 5.4.291 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.235 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.129
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/01d1b5c9abcaff29a43f1d17a19c33eec92c7dbe Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/10f555e3f573d004ae9d89b3276abb58c4ede5c3 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/2c331718d3389b6c5f6855078ab7171849e016bd Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/307cd1e2d3cb1cbc6c40c679cada6d7168b18431 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a42b69f692165ec39db42d595f4f65a4c8f42e44 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/d9366ac2f956a1948b68c0500f84a3462ff2ed8a Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e9f4dee534eb1b225b0a120395ad9bc2afe164d3 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f189654459423d4d48bef2d120b4bfba559e6039 Types: Patch
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 13, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/10f555e3f573d004ae9d89b3276abb58c4ede5c3
    Added Reference https://git.kernel.org/stable/c/307cd1e2d3cb1cbc6c40c679cada6d7168b18431
    Added Reference https://git.kernel.org/stable/c/d9366ac2f956a1948b68c0500f84a3462ff2ed8a
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Feb. 27, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-416
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 27, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: arp: use RCU protection in arp_xmit() arp_xmit() can be called without RTNL or RCU protection. Use RCU protection to avoid potential UAF.
    Added Reference https://git.kernel.org/stable/c/01d1b5c9abcaff29a43f1d17a19c33eec92c7dbe
    Added Reference https://git.kernel.org/stable/c/2c331718d3389b6c5f6855078ab7171849e016bd
    Added Reference https://git.kernel.org/stable/c/a42b69f692165ec39db42d595f4f65a4c8f42e44
    Added Reference https://git.kernel.org/stable/c/e9f4dee534eb1b225b0a120395ad9bc2afe164d3
    Added Reference https://git.kernel.org/stable/c/f189654459423d4d48bef2d120b4bfba559e6039
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
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact