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CVE-2025-21719

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ipmr: do not call mr_mfc_uses_dev() for unres entries syzbot found that calling mr_mfc_uses_dev() for unres entries would crash…

Published Feb 27, 2025CWE-125EPSS 0.21%

Overview

CVE-2025-21719 is a high-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ipmr: do not call mr_mfc_uses_dev() for unres entries

syzbot found that calling mr_mfc_uses_dev() for unres entries

would crash [1], because c->mfc_un.res.minvif / c->mfc_un.res.maxvif

alias to "struct sk_buff_head unresolved", which contain two pointers.

This code never worked, lets remove it.

[1]

Unable to handle kernel paging request at virtual address ffff5fff2d536613

KASAN: maybe wild-memory-access in range [0xfffefff96a9b3098-0xfffefff96a9b309f]

Modules linked in:

CPU: 1 UID: 0 PID: 7321 Comm: syz.0.16 Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024

pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : mr_mfc_uses_dev net/ipv4/ipmr_base.c:290 [inline]

pc : mr_table_dump+0x5a4/0x8b0 net/ipv4/ipmr_base.c:334

lr : mr_mfc_uses_dev net/ipv4/ipmr_base.c:289 [inline]

lr : mr_table_dump+0x694/0x8b0 net/ipv4/

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/15a901361ec3fb1c393f91880e1cbf24ec0a88bdRefgit.kernel.org/stable/c/26bb7d991f04eeef47dfad23e533834995c26f7aRefgit.kernel.org/stable/c/53df27fd38f84bd3cd6b004eb4ff3c4903114f1dRefgit.kernel.org/stable/c/547ef7e8cbb98f966c8719a3e15d4e078aaa9b47Refgit.kernel.org/stable/c/57177c5f47a8da852f8d76cf6945cf803f8bb9e5Refgit.kernel.org/stable/c/71a0fcb68c0a5f3ec912b540cd5d72148e6ee5f1Refgit.kernel.org/stable/c/a099834a51ccf9bbba3de86a251b3433539abfdeRefgit.kernel.org/stable/c/b379b3162ff55a70464c6a934ae9bf0497478a62Reflists.debian.org/debian-lts-announce/2025/03/msg00028.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00030.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21719?

CVE-2025-21719 is a high-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-21719?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21719?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-21719?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21719 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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