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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00053.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 affected < ce3c6165fce0f06305c806696882a3ad4b90e33f
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 affected < ea07480b23225942208f1b754fea1e7ec486d37e
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 affected < 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 affected < 4583748b65dee4d61bd50a2214715b4237bc152a
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 affected < a39f61d212d822b3062d7f70fa0588e50e55664e
2fbc6e89b2f1403189e624cabaf73e189c5e50c6 affected < 139512191bd06f1b496117c76372b2ce372c9a41
f415c264176e6095e9dee823e09c5bdd0ee0d337 affected —
98776a365da509ad923083ae54b38ee521c52742 affected —
860e2cc78c697c95bc749abb20047239fa1722ea affected —
2b1be6c925cdf4638811765a9160796291494b89 affected —
Linux Linux affected
Version Status Constraints
5.9 affected —
0 unaffected < 5.9
5.15.179 unaffected ≤ 5.15.*
6.1.129 unaffected ≤ 6.1.*
6.6.79 unaffected ≤ 6.6.*
6.12.16 unaffected ≤ 6.12.*
6.13.4 unaffected ≤ 6.13.*
6.14 unaffected ≤ *

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:*
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:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*

No data.

No data.

Project Subscriptions

Vendors Products
Linux Subscribe
Linux Kernel Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4102-1 linux-6.1 security update
EUVD EUVD EUVD-2025-5166 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.
Ubuntu USN Ubuntu USN USN-7510-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-2 Linux kernel (FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-4 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-5 Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-6 Linux kernel (AWS FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-7 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7510-8 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7511-1 Linux kernel (GCP) vulnerabilities
Ubuntu USN Ubuntu USN USN-7511-2 Linux kernel (GCP FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7511-3 Linux kernel (GKE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7512-1 Linux kernel (GCP) vulnerabilities
Ubuntu USN Ubuntu USN USN-7521-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7521-2 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7521-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7593-1 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7602-1 Linux kernel (Xilinx ZynqMP) vulnerabilities
Ubuntu USN Ubuntu USN USN-7703-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7703-2 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7703-3 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7703-4 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7719-1 Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7737-1 Linux kernel (Azure) vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41 cve-icon cve-icon
https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a cve-icon cve-icon
https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 cve-icon cve-icon
https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e cve-icon cve-icon
https://git.kernel.org/stable/c/ce3c6165fce0f06305c806696882a3ad4b90e33f cve-icon cve-icon
https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html cve-icon
https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2025-21766-a004@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-21766 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-21766 cve-icon
History

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Tue, 28 Oct 2025 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:*
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:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

Fri, 23 May 2025 02:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-413
Metrics threat_severity

Moderate

 threat_severity

Low

Thu, 13 Mar 2025 12:30:00 +0000

Type Values Removed Values Added
References

Fri, 28 Feb 2025 14:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Thu, 27 Feb 2025 02:45:00 +0000

Type Values Removed Values 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.
Title ipv4: use RCU protection in __ip_rt_update_pmtu()
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-11-03T19:37:21.502Z

Reserved: 2024-12-29T08:45:45.762Z

Link: CVE-2025-21766

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2025-02-27T03:15:17.273

Modified: 2025-11-03T20:17:16.687

Link: CVE-2025-21766

cve-icon Redhat

Severity : Low

Publid Date: 2025-02-27T00:00:00Z

Links: CVE-2025-21766 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses