Answer in brief
CVE-2021-47309 records a High severity (CVSS 7.8) vulnerability in net: validate lwtstate->data before returning from skb_tunnel_info(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <e7f3c9df40515a6c6b46f36c4c94cf48a043f887 || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <b61d327cd3cc5ea591f3bf751dd11e034f388bb5 || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <8bb1589c89e61e3b182dd546f1021928ebb5c2a6 || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <8aa13a86964cdec4fd969ef677c6614ff068641a || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <2179d96ec702cc33ead02a9ce40ece599b8538c5 || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <a915379594f1e045421635c6316d8f3ffa018c58 || >=61adedf3e3f1d3f032c5a6a299978d91eff6d555 <67a9c94317402b826fc3db32afc8f39336803d97 | e7f3c9df40515a6c6b46f36c4c94cf48a043f887, b61d327cd3cc5ea591f3bf751dd11e034f388bb5, 83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d, 8bb1589c89e61e3b182dd546f1021928ebb5c2a6, 8aa13a86964cdec4fd969ef677c6614ff068641a, 2179d96ec702cc33ead02a9ce40ece599b8538c5, a915379594f1e045421635c6316d8f3ffa018c58, 67a9c94317402b826fc3db32afc8f39336803d97 |
| Linux/Linuxgeneric | 4.3 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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 [ ... ]
Quoted source text, attributed separately from HOL analysis.