CVE-2021-47309

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2024-05-21. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

net: validate lwtstate->data before returning from skb_tunnel_info()

skb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info type without validation. lwtstate->data can have various types such as mpls_iptunnel_encap, etc and these are not compatible. So skb_tunnel_info() should validate before returning that pointer.

Splat looks like: BUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan] Read of size 2 at addr ffff888106ec2698 by task ping/811

CPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195 Call Trace: dump_stack_lvl+0x56/0x7b print_address_description.constprop.8.cold.13+0x13/0x2ee ? vxlan_get_route+0x418/0x4b0 [vxlan] ? vxlan_get_route+0x418/0x4b0 [vxlan] kasan_report.cold.14+0x83/0xdf ? vxlan_get_route+0x418/0x4b0 [vxlan] vxlan_get_route+0x418/0x4b0 [vxlan] [ ... ] vxlan_xmit_one+0x148b/0x32b0 [vxlan] [ ... ] vxlan_xmit+0x25c5/0x4780 [vxlan] [ ... ] dev_hard_start_xmit+0x1ae/0x6e0 __dev_queue_xmit+0x1f39/0x31a0 [ ... ] neigh_xmit+0x2f9/0x940 mpls_xmit+0x911/0x1600 [mpls_iptunnel] lwtunnel_xmit+0x18f/0x450 ip_finish_output2+0x867/0x2040 [ ... ]

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

May 21, 2024

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5
generic

net: validate lwtstate->data before returning from skb_tunnel_info() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 46× 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 123 total refreshes for this CVE.

  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-06 13:44 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
  4. 2026-08-05 09:40 UTCEG score recompute
  5. 2026-08-05 09:40 UTCGHSA enrichment
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  11. 2026-08-04 09:52 UTCGHSA enrichment
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  24. 2026-07-23 02:06 UTCEG score recompute
  25. 2026-07-22 22:53 UTCEG score recompute
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Frequently asked(5)

What is CVE-2021-47309?
CVE-2021-47309 is a high vulnerability published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: net: validate lwtstate->data before returning from skbtunnelinfo() skbtunnelinfo() returns pointer of lwtstate->data as iptunnelinfo type without validation. lwtstate->data can have various types such as mplsiptunnelencap, etc and…
When was CVE-2021-47309 disclosed?
CVE-2021-47309 was first published in the National Vulnerability Database on May 21, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47309 actively exploited?
CVE-2021-47309 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 83.9% of all scored CVEs.
What is the CVSS score of CVE-2021-47309?
CVE-2021-47309 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2021-47309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47309, 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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