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vxlan: use pskb_network_may_pull() in route_shortcircuit()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-74473

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74473

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "drivers/net/vxlan/vxlan_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/vxlan/vxlan_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74473

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#33167 · Revision 1
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Publisher date
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