CVE-2025-21766
ipv4: use RCU protection in __ip_rt_update_pmtu()
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear.
INFO
Published Date :
Feb. 27, 2025, 3:15 a.m.
Last Modified :
Nov. 3, 2025, 8:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to include the RCU protection fix.
- Verify the implementation of RCU protection in related functions.
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-2025-21766.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-21766 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-2025-21766
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-2025-21766 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-21766 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.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html -
Initial Analysis by [email protected]
Oct. 28, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo 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) 5.16 up to (excluding) 6.1.129 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14.200 up to (excluding) 4.15 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.19.148 up to (excluding) 4.20 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4.68 up to (excluding) 5.5 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.8.12 up to (excluding) 5.9 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.9.1 up to (excluding) 5.15.179 *cpe:2.3:o:linux:linux_kernel:5.9:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.9:rc8:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:* Added Reference Type kernel.org: https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ce3c6165fce0f06305c806696882a3ad4b90e33f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e 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/ce3c6165fce0f06305c806696882a3ad4b90e33f -
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: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear. Added Reference https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41 Added Reference https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a Added Reference https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 Added Reference https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e Added Reference https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e