CVE-2026-74701 (GCVE-0-2026-74701)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:41
VLAI
Title
net/openvswitch: check Ethernet header length in key_extract()
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < e85278afd4890dd190ba3c7a1b1a712b801c9fe1 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < 81f9b09f0ea3ba9ab966dd17e9f32625a14555e9 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < 831471718f6e19aed1a330b03b53190a90e06466 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < d8bea341b183190ce6c055ab0e64ab78eb9a7290 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < 0b60b55652ba772b173dddc63f3851e1d2dd5927 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < a8139285c8925efe59af28a9169bb2fda91bff15 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < 9b8cfbb58b85bfa7a78fac47fdc77396cd01f699 (git)
Affected: 217ac77a3c2524d999730b2a80b61fcc2d0f734a , < cf6f8b29befb92173659bcef6a441d274947bfae (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/openvswitch: check Ethernet header length in key_extract()\n\nWhen a packet arrives on an ARPHRD_NONE device (e.g. TUN),\novs_flow_key_extract() trusts the user-provided skb-\u003eprotocol field: if\nit is ETH_P_TEB, the packet is classified as MAC_PROTO_ETHERNET and\nkey_extract() is called without ensuring the skb has ETH_HLEN (14) bytes\nof linear data. key_extract() unconditionally pulls 2 * ETH_ALEN bytes\nfor MAC addresses and parse_ethertype() pulls 2 more, either of which\ntriggers a kernel BUG in __skb_pull() when the linear area is too small.\n\n  kernel BUG at include/linux/skbuff.h:2848!\n  RIP: 0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933\n  ovs_flow_key_extract+0x419/0xa70\n  ovs_vport_receive+0x222/0x390\n  netdev_frame_hook+0x3e0/0x630\n  tun_get_user+0x2d0c/0x38e0\n\nFixed by calling check_header() in key_extract() before accessing the\nEthernet header."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The crash is reached when a crafted skb is processed in ovs_flow_key_extract() via ovs_vport_receive(); the documented reproducer injects it through tun_get_user() (write to a TUN fd), and the alternate path is OVS_PACKET_CMD_EXECUTE netlink\u2014both require local syscall access, not remote packet delivery.\nAC:L - The attacker fully controls skb length, skb-\u003eprotocol (ETH_P_TEB), and linear versus fragmented layout; sending a sub-14-byte payload with ETH_P_TEB on an ARPHRD_NONE OVS port deterministically reaches key_extract() and triggers __skb_pull() BUG() without races or special heap layout.\nPR:L - Attaching an ARPHRD_NONE netdev to an OVS datapath and using OVS_PACKET_CMD_EXECUTE require CAP_NET_ADMIN (GENL_UNS_ADMIN_PERM, netnsok); CAP_NET_ADMIN is obtainable inside an unprivileged user+network namespace, and TUN injection likewise requires CAP_NET_ADMIN or a TUN fd granted by a privileged setup.\nUI:N - No victim interaction is required; once OVS bridges an ARPHRD_NONE port (e.g. TUN), the attacker triggers the bug by injecting a single malformed packet via write() or netlink without any other user action.\nS:U - Impact is a kernel BUG/panic in the same kernel security authority as the attacker; this is not a VM escape, IOMMU bypass, or cross-namespace privilege boundary crossing.\nC:H - Before the BUG, key_extract() calls ether_addr_copy() and parse_ethertype() on skb-\u003edata without validating ETH_HLEN, performing out-of-bounds reads of kernel skb buffer memory beyond the actual packet payload.\nI:H - Unchecked __skb_pull() on an undersized skb corrupts skb-\u003edata and skb-\u003elen metadata; this memory corruption of kernel packet state can be leveraged for further integrity violations beyond a simple controlled crash.\nA:H - The flaw triggers kernel BUG() at __skb_pull() in include/linux/skbuff.h, producing a kernel oops/panic and denying all system availability on affected hosts running Open vSwitch with ARPHRD_NONE ports."
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    "dateReserved": "2026-08-15T05:44:03.927Z",
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0010:key_extract+0xa7e/0xd90 net/openvswitch/flow.c:933\\n  ovs_flow_key_extract+0x419/0xa70\\n  ovs_vport_receive+0x222/0x390\\n  netdev_frame_hook+0x3e0/0x630\\n  tun_get_user+0x2d0c/0x38e0\\n\\nFixed by calling check_header() in key_extract() before accessing the\\nEthernet header.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/openvswitch/flow.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/openvswitch/flow.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.10\",\"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\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0b60b55652ba772b173dddc63f3851e1d2dd5927\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81f9b09f0ea3ba9ab966dd17e9f32625a14555e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/831471718f6e19aed1a330b03b53190a90e06466\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b8cfbb58b85bfa7a78fac47fdc77396cd01f699\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a8139285c8925efe59af28a9169bb2fda91bff15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf6f8b29befb92173659bcef6a441d274947bfae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d8bea341b183190ce6c055ab0e64ab78eb9a7290\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e85278afd4890dd190ba3c7a1b1a712b801c9fe1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:54:46+00:00",
      "cve": "CVE-2026-74701",
      "id": "CVE-2026-74701",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/openvswitch: check Ethernet header length in key_extract()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74701.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.