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CVE-2024-56751

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ipv6: release nexthop on device removal The CI is hitting some aperiodic hangup at device removal time in the pmtu.sh self-test…

Published Dec 29, 2024EPSS 0.22%

Overview

CVE-2024-56751 is a medium-severity vulnerability. It was published on December 29, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

ipv6: release nexthop on device removal

The CI is hitting some aperiodic hangup at device removal time in the

pmtu.sh self-test:

unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6

ref_tracker: veth_A-R1@ffff888013df15d8 has 1/5 users at

dst_init+0x84/0x4a0

dst_alloc+0x97/0x150

ip6_dst_alloc+0x23/0x90

ip6_rt_pcpu_alloc+0x1e6/0x520

ip6_pol_route+0x56f/0x840

fib6_rule_lookup+0x334/0x630

ip6_route_output_flags+0x259/0x480

ip6_dst_lookup_tail.constprop.0+0x5c2/0x940

ip6_dst_lookup_flow+0x88/0x190

udp_tunnel6_dst_lookup+0x2a7/0x4c0

vxlan_xmit_one+0xbde/0x4a50 [vxlan]

vxlan_xmit+0x9ad/0xf20 [vxlan]

dev_hard_start_xmit+0x10e/0x360

__dev_queue_xmit+0xf95/0x18c0

arp_solicit+0x4a2/0xe00

neigh_probe+0xaa/0xf0

While the first suspect is the dst_cache, explicitly tracking the dst

owing the last device reference via probes proved such dst is held by

the nexthop in the originating fib6_info

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/0e4c6faaef8a24b762a24ffb767280e263ef8e10Refgit.kernel.org/stable/c/43e25adc80269f917d2a195f0d59f74cdd182955Refgit.kernel.org/stable/c/77aa9855a878fb43f547ddfbda3127a1e88ad31aRefgit.kernel.org/stable/c/a3c3f8a4d025acc8c857246ec2b812c59102487aRefgit.kernel.org/stable/c/b2f26a27ea3f72f75d18330f76f5d1007c791848Refgit.kernel.org/stable/c/eb02688c5c45c3e7af7e71f036a7144f5639cbfeReflists.debian.org/debian-lts-announce/2025/03/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-56751?

CVE-2024-56751 is a medium-severity vulnerability. It was published on December 29, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-56751?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-56751?

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-2024-56751?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-56751 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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