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

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-05-04 07:08
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
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    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)
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\"5.10.53\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.5\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/dst_metadata.h\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-a5840b7849dd\"}, \"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 [ ... ]\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:05:42.863Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47309\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T05:32:08.596Z\", \"dateReserved\": \"2024-05-21T14:28:16.972Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:27.981Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.