CVE-2024-56751

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-12-29. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

Similar to commit f5b51fe804ec ("ipv6: route: purge exception on removal"), we need to explicitly release the originating fib info when disconnecting a to-be-removed device from a live ipv6 dst: move the fib6_info cleanup into ip6_dst_ifdown().

Tested running:

./pmtu.sh cleanup_ipv6_exception

in a tight loop for more than 400 iterations with no spat, running an unpatched kernel I observed a splat every ~10 iterations.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

December 29, 2024

Last Modified

November 3, 2025

References (7)

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.11.0-18.18) @ oracular2026-05-23ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.11.0-1005.5) @ oracular2026-05-23ubuntu
ubuntulinux-tools-oem-24.04b (6.11.0-1015.15) @ noble2026-05-23ubuntu
ubuntulinux-virtual (6.8.0-58.60) @ noble2026-05-23ubuntu
ubuntulinux-tools-gcp-edge (6.8.0-1028.30~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1027.29~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-tools-gkeop-6.8 (6.8.0-1010.12) @ noble2026-05-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-58.60~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-tools-raspi (6.8.0-1028.32) @ noble2026-05-23ubuntu
ubuntulinux-tools-raspi-realtime (6.8.0-2023.24) @ noble2026-05-23ubuntu
ubuntulinux-tools-realtime-hwe-24.04 (6.8.1-1020.21) @ noble2026-05-23ubuntu
ubuntulinux-tools-azure-nvidia (6.8.0-1014.15) @ noble2026-05-23ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.144.141) @ jammy2026-05-23ubuntu
ubuntulinux-tools-realtime-5.15 (5.15.0.1088.92) @ jammy2026-05-23ubuntu
ubuntulinux-tools-gcp-fips-5.15 (5.15.0.1087.77) @ jammy2026-05-23ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1083.81) @ jammy2026-05-23ubuntu
ubuntulinux-tools-kvm-5.15 (5.15.0.1084.80) @ jammy2026-05-23ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1094.92) @ jammy2026-05-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-host (5.15.0-1052.56) @ jammy2026-05-23ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1094.79) @ jammy2026-05-23ubuntu
ubuntulinux-tools-intel-iotg-edge (5.15.0.1083.89~20.04.1) @ focal2026-05-23ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1094.103~20.04.1) @ focal2026-05-23ubuntu
linuxKernel @ 5.15.181—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(23)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 118 total refreshes for this CVE.

  1. 2026-08-07 16:26 UTCEPSS rescore
  2. 2026-08-06 13:45 UTCEPSS rescore
  3. 2026-08-05 19:16 UTCEPSS rescore
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  20. 2026-07-23 02:45 UTCEG score recompute
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  1. 2026-07-19 02:28 UTCEPSS rescore
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  8. 2026-07-13 22:29 UTCEPSS rescore
  9. 2026-07-13 15:08 UTCOSV refresh
  10. 2026-07-13 06:12 UTCEPSS rescore
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  26. 2026-06-29 14:05 UTCEPSS rescore
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  32. 2026-06-25 13:49 UTCEPSS rescore
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  34. 2026-06-25 12:31 UTCOSV refresh
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  45. 2026-06-17 17:52 UTCEPSS rescore
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  60. 2026-06-08 03:28 UTCOSV refresh
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Frequently asked(5)

What is CVE-2024-56751?
CVE-2024-56751 is a medium vulnerability published on December 29, 2024. 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: unregisternetdevice: waiting for vethA-R1 to become free. Usage count = 6 reftracker:…
When was CVE-2024-56751 disclosed?
CVE-2024-56751 was first published in the National Vulnerability Database on December 29, 2024, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-56751 actively exploited?
CVE-2024-56751 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.1% of all scored CVEs.
What is the CVSS score of CVE-2024-56751?
CVE-2024-56751 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2024-56751?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-56751, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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