CVE-2026-74473 (GCVE-0-2026-74473)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
Title
vxlan: use pskb_network_may_pull() in route_shortcircuit()
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: use pskb_network_may_pull() in route_shortcircuit() route_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr)) (or ipv6hdr), which checks if bytes are available starting from skb->data. However, in vxlan_xmit(), skb->data points to the MAC header, so skb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20) only checks 20 bytes from skb->data (which is 14 bytes MAC header + 6 bytes of IP header), leaving the rest of the IP header potentially un-pulled in non-linear frags. Subsequent dereferences of ip_hdr(skb)->daddr can read beyond the pulled linear buffer length. Fix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to the length check to ensure the full network header is present in the linear buffer.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e4f67addf158f98f8197e08974966b18480dc751 , < c419af4924c1593500a40519730ed98575d04a3e (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 6bd0a3a1b5744166946f0c551a6665c3b46b05e4 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 214ba43faf106cb06cd3dd30999c5c809c868b53 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 42887be7c4cf283cce02cd0fb6411221167c8b6c (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < aa0d31376d574ac858a40078431a77127bf04ee4 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < ee799977d7941dbfb11049e17edd9eaf4f8820f7 (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 4f3f96e771a20263635bb5e1307c112d613b4bbd (git)
Affected: e4f67addf158f98f8197e08974966b18480dc751 , < 26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use pskb_network_may_pull() in route_shortcircuit()\n\nroute_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr))\n(or ipv6hdr), which checks if bytes are available starting from skb-\u003edata.\n\nHowever, in vxlan_xmit(), skb-\u003edata points to the MAC header, so\nskb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20)\nonly checks 20 bytes from skb-\u003edata (which is 14 bytes MAC header + 6 bytes of\nIP header), leaving the rest of the IP header potentially un-pulled in non-linear\nfrags. Subsequent dereferences of ip_hdr(skb)-\u003edaddr can read beyond the pulled\nlinear buffer length.\n\nFix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to\nthe length check to ensure the full network header is present in the linear buffer."
        }
      ],
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            "version": "3.1"
          },
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              "value": "AV:N - route_shortcircuit() runs in vxlan_xmit() during overlay transmit; remote packets forwarded or routed onto a VXLAN netdev with route-short-circuit enabled reach this path without local access, matching net-stack guidance for network-reachable packet processing on cloud/SDN nodes.\nAC:L - An attacker can reliably craft non-linear skbs (scatter/gather/frags and size boundaries) and aim traffic at a known router MAC in the VXLAN FDB; no race or uncontrollable memory layout is required beyond targeting an RSC-enabled deployment, which is the scored scenario.\nPR:N - Exploitation needs no credentials or capabilities on the victim when VXLAN RSC is already configured; a remote peer only has to send IPv4/IPv6 frames that traverse the tunnel transmit path, with no netlink setup or CAP_NET_ADMIN in the target namespace.\nUI:N - Triggering the bug requires only attacker-controlled network traffic through the overlay; no victim mount, file open, link click, or other interactive action is needed.\nS:U - Impact is confined to the kernel hosting the VXLAN endpoint (memory disclosure, packet-header corruption, or crash); it does not cross VM, container, or IOMMU security boundaries by itself.\nC:H - The faulty pskb_may_pull() check leaves the IP/IPv6 header in non-linear frags, so ip_hdr(skb)-\u003edaddr/ipv6 daddr is read past the linear head and can disclose adjacent kernel memory per OOB-read guidance.\nI:H - The out-of-bounds destination address feeds neigh_lookup() and may rewrite eth_hdr()-\u003eh_dest before encapsulation, giving attacker-influenced overlay forwarding and a memory-safety primitive in the transmit path.\nA:H - Dereferencing network-header fields beyond the pulled linear buffer can provoke kernel oops/panic on affected skb layouts, and OOB reads in xmit context are treated as high availability impact even when exploitation is not fully weaponized."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:25.639Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/c419af4924c1593500a40519730ed98575d04a3e"
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        {
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      "title": "vxlan: use pskb_network_may_pull() in route_shortcircuit()",
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    "cveId": "CVE-2026-74473",
    "datePublished": "2026-08-15T12:27:09.382Z",
    "dateReserved": "2026-08-15T05:44:03.903Z",
    "dateUpdated": "2026-08-19T16:37:25.639Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "percentile": "0.43296"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-74473",
      "id": "msrc_CVE-2026-74473",
      "initial_release_date": "2026-08-23T15:02:03.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vxlan: use pskb_network_may_pull() in route_shortcircuit()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74473.json",
      "version": "3"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use pskb_network_may_pull() in route_shortcircuit()\n\nroute_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr))\n(or ipv6hdr), which checks if bytes are available starting from skb-\u003edata.\n\nHowever, in vxlan_xmit(), skb-\u003edata points to the MAC header, so\nskb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20)\nonly checks 20 bytes from skb-\u003edata (which is 14 bytes MAC header + 6 bytes of\nIP header), leaving the rest of the IP header potentially un-pulled in non-linear\nfrags. Subsequent dereferences of ip_hdr(skb)-\u003edaddr can read beyond the pulled\nlinear buffer length.\n\nFix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to\nthe length check to ensure the full network header is present in the linear buffer."
          }
        ],
        "id": "CVE-2026-74473",
        "lastModified": "2026-08-19T17:21:04.623",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T13:17:52.060",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/214ba43faf106cb06cd3dd30999c5c809c868b53"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/42887be7c4cf283cce02cd0fb6411221167c8b6c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4f3f96e771a20263635bb5e1307c112d613b4bbd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          {
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ee799977d7941dbfb11049e17edd9eaf4f8820f7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:50:04+00:00",
      "cve": "CVE-2026-74473",
      "id": "CVE-2026-74473",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: use pskb_network_may_pull() in route_shortcircuit()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74473.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:20:33Z",
      "cve": "CVE-2026-74473",
      "id": "CVE-2026-74473",
      "initial_release_date": "2026-08-15T23:52:15Z",
      "product_status:known_affected": "358",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74473",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74473.json",
      "version": "7"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.