CVE-2026-80681 (GCVE-0-2026-80681)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-29 06:22
VLAI
Title
vxlan: re-fetch eth header after route_shortcircuit()
Summary
In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb). Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head. In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest. Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().
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: ae8840825605f36f98f247323edc150e761cb64e , < 6375093eb45cd7d89f1945f939eeae3b29d79f56 (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < 1b7f7b653e3557690047c62f03b80a24ea5a58a5 (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < bf045341dfb3e767f0ff94cf240ce3c371973bd4 (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < 2355c8c26d2aa1b4385b369e67202e47d460d555 (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < 1235e017aa11cf01e91b613c4c5ed6aa28934fff (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < c9dceac9e1c7c772c43c732fc0d325e72835801a (git)
Affected: ae8840825605f36f98f247323edc150e761cb64e , < 1395a676ec15a0a02a2a6d86602324f2d5fd41d5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 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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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: re-fetch eth header after route_shortcircuit()\n\nBefore route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).\n\nInside route_shortcircuit(), pskb_may_pull() can be called, which may\nreallocate skb-\u003ehead.\n\nIn this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to\nfreed memory, leading to a use-after-free when dereferencing eth-\u003eh_dest.\n\nFix this by updating eth = eth_hdr(skb) after calling route_shortcircuit()."
        }
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
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              "value": "AV:N - The bug is in vxlan_xmit(), reached when the kernel transmits packets out a VXLAN netdev via routing, bridging, or overlay forwarding; remote peers can inject IPv4/IPv6 Ethernet frames that traverse this TX path on cloud, Kubernetes, and data-center VXLAN deployments.\nAC:L - An attacker controlling overlay or forwarded traffic can reliably meet RSC prerequisites (router FDB entry, IPv4/IPv6 ethertype, neighbour MAC mismatch, cloned/nonlinear skb) so route_shortcircuit() calls pskb_may_pull/skb_cow_head and reallocates skb-\u003ehead, invalidating the cached eth pointer.\nPR:N - Exploitation requires only sending network traffic processed by an existing VXLAN interface with RSC enabled, not host administrator credentials; remote overlay peers and unauthenticated senders whose packets are forwarded through VXLAN need no elevated privileges on the target.\nUI:N - The use-after-free is triggered automatically during kernel packet transmit processing in vxlan_xmit() with no action required from a local user or administrator beyond normal network operation on a VXLAN-enabled host.\nS:U - The stale eth_hdr pointer causes heap use-after-free within the kernel\u0027s own memory domain during VXLAN transmit processing; impact is standard in-kernel memory corruption and does not inherently cross VM, container, or IOMMU security boundaries.\nC:H - After route_shortcircuit() reallocates skb-\u003ehead, vxlan_xmit() dereferences the stale eth pointer for eth-\u003eh_dest, constituting a heap use-after-free read that can disclose adjacent freed slab contents and support further kernel memory disclosure primitives.\nI:H - Use-after-free of the Ethernet header buffer in skb head memory enables attacker-controlled reuse of freed kmalloc slabs, a well-established path to heap grooming and arbitrary kernel memory corruption or control-flow hijacking beyond the immediate MAC header read.\nA:H - Dereferencing a freed skb head pointer in vxlan_xmit() can cause an immediate kernel oops or panic from invalid memory access, and UAF heap corruption routinely destabilizes or crashes the system even when full exploitation is not pursued."
            }
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        "dateUpdated": "2026-08-29T06:22:07.840Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      "title": "vxlan: re-fetch eth header after route_shortcircuit()",
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    "cveId": "CVE-2026-80681",
    "datePublished": "2026-08-28T06:52:48.896Z",
    "dateReserved": "2026-08-26T14:34:25.783Z",
    "dateUpdated": "2026-08-29T06:22:07.840Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-80681",
      "date": "2026-08-31",
      "epss": "0.00506",
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route_shortcircuit().\"}],\"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\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"6375093eb45cd7d89f1945f939eeae3b29d79f56\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"1b7f7b653e3557690047c62f03b80a24ea5a58a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"bf045341dfb3e767f0ff94cf240ce3c371973bd4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"2355c8c26d2aa1b4385b369e67202e47d460d555\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"1235e017aa11cf01e91b613c4c5ed6aa28934fff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"c9dceac9e1c7c772c43c732fc0d325e72835801a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ae8840825605f36f98f247323edc150e761cb64e\",\"lessThan\":\"1395a676ec15a0a02a2a6d86602324f2d5fd41d5\",\"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\":\"3.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.10\",\"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\":\"6.6.151\",\"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/1235e017aa11cf01e91b613c4c5ed6aa28934fff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T14:30:57+00:00",
      "cve": "CVE-2026-80681",
      "id": "CVE-2026-80681",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vxlan: re-fetch eth header after route_shortcircuit()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80681.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • 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.


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