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net/openvswitch: check Ethernet header length in key_extract()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/openvswitch: check Ethernet header length in key_extract() When a packet arrives on an ARPHRD_NONE device (e.g. TUN), ovs_flow_key_extract() trusts the user-provided skb->protocol field: if it is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and key_extract() is called without ensuring the skb has ETH_HLEN (14) bytes of linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes for MAC addresses and parse_ethertype() pulls 2 more, either of which triggers a kernel BUG in __skb_pull() when the linear area is too small. kernel BUG at include/linux/skbuff.h:2848! RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933 ovs_flow_key_extract+0x419/0xa70 ovs_vport_receive+0x222/0x390 netdev_frame_hook+0x3e0/0x630 tun_get_user+0x2d0c/0x38e0 Fixed by calling check_header() in key_extract() before accessing the Ethernet header.

Announced Source revision 1
Original source ↗

CVE-2026-74701

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-2026-74701

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": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "e85278afd4890dd190ba3c7a1b1a712b801c9fe1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "81f9b09f0ea3ba9ab966dd17e9f32625a14555e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "831471718f6e19aed1a330b03b53190a90e06466",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "d8bea341b183190ce6c055ab0e64ab78eb9a7290",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "0b60b55652ba772b173dddc63f3851e1d2dd5927",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "a8139285c8925efe59af28a9169bb2fda91bff15",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "9b8cfbb58b85bfa7a78fac47fdc77396cd01f699",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "217ac77a3c2524d999730b2a80b61fcc2d0f734a",
        "lessThan": "cf6f8b29befb92173659bcef6a441d274947bfae",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/openvswitch/flow.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.10",
        "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": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/openvswitch/flow.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74701

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34273 · Revision 1
Added to Heist Feed
Publisher date
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