CVE-2024-35839 (GCVE-0-2024-35839)

Vulnerability from cvelistv5 – Published: 2024-05-17 14:27 – Updated: 2025-05-04 09:06
VLAI?
Title
netfilter: bridge: replace physindev with physinif in nf_bridge_info
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: replace physindev with physinif in nf_bridge_info An skb can be added to a neigh->arp_queue while waiting for an arp reply. Where original skb's skb->dev can be different to neigh's neigh->dev. For instance in case of bridging dnated skb from one veth to another, the skb would be added to a neigh->arp_queue of the bridge. As skb->dev can be reset back to nf_bridge->physindev and used, and as there is no explicit mechanism that prevents this physindev from been freed under us (for instance neigh_flush_dev doesn't cleanup skbs from different device's neigh queue) we can crash on e.g. this stack: arp_process neigh_update skb = __skb_dequeue(&neigh->arp_queue) neigh_resolve_output(..., skb) ... br_nf_dev_xmit br_nf_pre_routing_finish_bridge_slow skb->dev = nf_bridge->physindev br_handle_frame_finish Let's use plain ifindex instead of net_device link. To peek into the original net_device we will use dev_get_by_index_rcu(). Thus either we get device and are safe to use it or we don't get it and drop skb.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c4e70a87d975d1f561a00abfe2d3cefa2a486c95 , < 7ae19ee81ca56b13c50a78de6c47d5b8fdc9d97b (git)
Affected: c4e70a87d975d1f561a00abfe2d3cefa2a486c95 , < 9325e3188a9cf3f69fc6f32af59844bbc5b90547 (git)
Affected: c4e70a87d975d1f561a00abfe2d3cefa2a486c95 , < 544add1f1cfb78c3dfa3e6edcf4668f6be5e730c (git)
Affected: c4e70a87d975d1f561a00abfe2d3cefa2a486c95 , < 9874808878d9eed407e3977fd11fee49de1e1d86 (git)
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    Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 6.1.75 , ≤ 6.1.* (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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Where original skb\u0027s skb-\u003edev can be different to neigh\u0027s\\nneigh-\u003edev. For instance in case of bridging dnated skb from one veth to\\nanother, the skb would be added to a neigh-\u003earp_queue of the bridge.\\n\\nAs skb-\u003edev can be reset back to nf_bridge-\u003ephysindev and used, and as\\nthere is no explicit mechanism that prevents this physindev from been\\nfreed under us (for instance neigh_flush_dev doesn\u0027t cleanup skbs from\\ndifferent device\u0027s neigh queue) we can crash on e.g. this stack:\\n\\narp_process\\n  neigh_update\\n    skb = __skb_dequeue(\u0026neigh-\u003earp_queue)\\n      neigh_resolve_output(..., skb)\\n        ...\\n          br_nf_dev_xmit\\n            br_nf_pre_routing_finish_bridge_slow\\n              skb-\u003edev = nf_bridge-\u003ephysindev\\n              br_handle_frame_finish\\n\\nLet\u0027s use plain ifindex instead of net_device link. To peek into the\\noriginal net_device we will use dev_get_by_index_rcu(). Thus either we\\nget device and are safe to use it or we don\u0027t get it and drop skb.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:56:18.954Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35839\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:56:18.954Z\", \"dateReserved\": \"2024-05-17T13:50:33.104Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T14:27:30.524Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.