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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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/vxlan/vxlan_core.c"
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      "cpeApplicability": [
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                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "7.2",
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              ],
              "negate": false,
              "operator": "OR"
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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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:25.639Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c419af4924c1593500a40519730ed98575d04a3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/6bd0a3a1b5744166946f0c551a6665c3b46b05e4"
        },
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        },
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        },
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          "url": "https://git.kernel.org/stable/c/aa0d31376d574ac858a40078431a77127bf04ee4"
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        {
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        }
      ],
      "title": "vxlan: use pskb_network_may_pull() in route_shortcircuit()",
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    "assignerShortName": "Linux",
    "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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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74473",
      "date": "2026-09-10",
      "epss": "0.00525",
      "percentile": "0.42842"
    },
    "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"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74473\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:52.060\",\"lastModified\":\"2026-08-19T17:21:04.623\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/vxlan/vxlan_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"c419af4924c1593500a40519730ed98575d04a3e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"6bd0a3a1b5744166946f0c551a6665c3b46b05e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"214ba43faf106cb06cd3dd30999c5c809c868b53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"42887be7c4cf283cce02cd0fb6411221167c8b6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"aa0d31376d574ac858a40078431a77127bf04ee4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"ee799977d7941dbfb11049e17edd9eaf4f8820f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"4f3f96e771a20263635bb5e1307c112d613b4bbd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f67addf158f98f8197e08974966b18480dc751\",\"lessThan\":\"26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/vxlan/vxlan_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"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\"},{\"url\":\"https://git.kernel.org/stable/c/6bd0a3a1b5744166946f0c551a6665c3b46b05e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa0d31376d574ac858a40078431a77127bf04ee4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c419af4924c1593500a40519730ed98575d04a3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee799977d7941dbfb11049e17edd9eaf4f8820f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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": "2026-08-22T00:53:19Z",
      "cve": "CVE-2026-74473",
      "id": "CVE-2026-74473",
      "initial_release_date": "2026-08-15T23:52:15Z",
      "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": "4"
    }
  }
}



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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.

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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.