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CVE-2021-47309 (GCVE-0-2021-47309)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
Title
net: validate lwtstate->data before returning from skb_tunnel_info()
Summary
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 [ ... ]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-23 19:12 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < e7f3c9df40515a6c6b46f36c4c94cf48a043f887 (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < b61d327cd3cc5ea591f3bf751dd11e034f388bb5 (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 8bb1589c89e61e3b182dd546f1021928ebb5c2a6 (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 8aa13a86964cdec4fd969ef677c6614ff068641a (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 2179d96ec702cc33ead02a9ce40ece599b8538c5 (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < a915379594f1e045421635c6316d8f3ffa018c58 (git)
Affected: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 , < 67a9c94317402b826fc3db32afc8f39336803d97 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 4.4.277 , ≤ 4.4.* (semver)
Unaffected: 4.9.277 , ≤ 4.9.* (semver)
Unaffected: 4.14.241 , ≤ 4.14.* (semver)
Unaffected: 4.19.199 , ≤ 4.19.* (semver)
Unaffected: 5.4.135 , ≤ 5.4.* (semver)
Unaffected: 5.10.53 , ≤ 5.10.* (semver)
Unaffected: 5.13.5 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: validate lwtstate-\u003edata before returning from skb_tunnel_info()\n\nskb_tunnel_info() returns pointer of lwtstate-\u003edata as ip_tunnel_info\ntype without validation. lwtstate-\u003edata can have various types such as\nmpls_iptunnel_encap, etc and these are not compatible.\nSo skb_tunnel_info() should validate before returning that pointer.\n\nSplat looks like:\nBUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]\nRead of size 2 at addr ffff888106ec2698 by task ping/811\n\nCPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195\nCall Trace:\n dump_stack_lvl+0x56/0x7b\n print_address_description.constprop.8.cold.13+0x13/0x2ee\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n kasan_report.cold.14+0x83/0xdf\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n vxlan_get_route+0x418/0x4b0 [vxlan]\n [ ... ]\n vxlan_xmit_one+0x148b/0x32b0 [vxlan]\n [ ... ]\n vxlan_xmit+0x25c5/0x4780 [vxlan]\n [ ... ]\n dev_hard_start_xmit+0x1ae/0x6e0\n __dev_queue_xmit+0x1f39/0x31a0\n [ ... ]\n neigh_xmit+0x2f9/0x940\n mpls_xmit+0x911/0x1600 [mpls_iptunnel]\n lwtunnel_xmit+0x18f/0x450\n ip_finish_output2+0x867/0x2040\n [ ... ]"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - Exploitation requires locally configuring a non-IP LWT route (e.g. MPLS encap) whose output device is a tunnel that calls skb_tunnel_info() (VXLAN/GENEVE), then sending traffic on that path via netlink/syscalls\u2014not a remote packet-only entry point.\nAC:L - Once the LWT-over-tunnel topology is set up, the bug triggers reliably on ordinary transmit (as in the reported ping splat); the attacker fully controls configuration and packet generation with no race or luck required.\nPR:L - Creating VXLAN/GENEVE devices and MPLS/other LWT routes needs CAP_NET_ADMIN, which an unprivileged user obtains in a user+net namespace (unshare -Urn); after setup even a normal local send triggers the OOB.\nUI:N - No victim action is required; the attacker configures the netns topology and sends packets themselves.\nS:U - Impact stays within the kernel\u2019s own authority (local memory corruption/DoS/privilege escalation); this is not a VM, IOMMU, or other cross-boundary escape.\nC:H - skb_tunnel_info() type-confuses a small mpls_iptunnel_encap (or similar) as a much larger ip_tunnel_info, producing unbounded slab out-of-bounds reads of adjacent kernel heap that can disclose memory (e.g. via tunnel key fields or BPF get_tunnel_key).\nI:H - This is heap type confusion; on collect-metadata VXLAN/GENEVE paths the bogus info drives \u0026info-\u003edst_cache and related state, enabling out-of-bounds writes into adjacent heap when those fields are attacker-influenced.\nA:H - The documented KASAN slab-out-of-bounds in vxlan_get_route demonstrates a kernel oops/crash path, and invalid heap accesses can panic or hang the machine."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:47:13.551Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e7f3c9df40515a6c6b46f36c4c94cf48a043f887"
            },
            {
              "url": "https://git.kernel.org/stable/c/b61d327cd3cc5ea591f3bf751dd11e034f388bb5"
            },
            {
              "url": "https://git.kernel.org/stable/c/83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d"
            },
            {
              "url": "https://git.kernel.org/stable/c/8bb1589c89e61e3b182dd546f1021928ebb5c2a6"
            },
            {
              "url": "https://git.kernel.org/stable/c/8aa13a86964cdec4fd969ef677c6614ff068641a"
            },
            {
              "url": "https://git.kernel.org/stable/c/2179d96ec702cc33ead02a9ce40ece599b8538c5"
            },
            {
              "url": "https://git.kernel.org/stable/c/a915379594f1e045421635c6316d8f3ffa018c58"
            },
            {
              "url": "https://git.kernel.org/stable/c/67a9c94317402b826fc3db32afc8f39336803d97"
            }
          ],
          "title": "net: validate lwtstate-\u003edata before returning from skb_tunnel_info()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47309",
        "datePublished": "2024-05-21T14:35:27.981Z",
        "dateReserved": "2024-05-21T14:28:16.972Z",
        "dateUpdated": "2026-08-05T08:47:13.551Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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