CVE-2026-74710 (GCVE-0-2026-74710)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:41
VLAI
Title
xsk: require at least 16 bytes of TX metadata
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: require at least 16 bytes of TX metadata AF_XDP accepts a TX metadata length as small as eight bytes, but every supported request needs the flags plus at least one eight-byte request field. Such short metadata also lets the kernel read beyond the registered area. Require 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve compatibility with applications that do not use launch-time metadata.
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: 341ac980eab90ac1f6c22ee9f9da83ed9604d899 , < 21b8536aee819792f1b4b38b9aacf2a073025d49 (git)
Affected: 341ac980eab90ac1f6c22ee9f9da83ed9604d899 , < 642c6e73fce17fdca93a5793c4d22359fda866d7 (git)
Affected: 341ac980eab90ac1f6c22ee9f9da83ed9604d899 , < cfb9d2976b277e554e28c165e3eff4b4a8ea10bd (git)
Affected: 341ac980eab90ac1f6c22ee9f9da83ed9604d899 , < 1bb30b181d9f0484e141f8411e15ed906d5c6780 (git)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (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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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xdp/xdp_umem.c"
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      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.8",
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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\nxsk: require at least 16 bytes of TX metadata\n\nAF_XDP accepts a TX metadata length as small as eight bytes, but every\nsupported request needs the flags plus at least one eight-byte request\nfield. Such short metadata also lets the kernel read beyond the registered\narea.\n\nRequire 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve\ncompatibility with applications that do not use launch-time metadata."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through local AF_XDP setup\u2014socket(AF_XDP), setsockopt(XDP_UMEM_REG) with tx_metadata_len=8, ring configuration, bind, and TX descriptor submission\u2014not via remote packet handling or network-facing services.\nAC:L - The attacker fully controls tx_metadata_len, descriptor addresses, metadata flags, and TX timing, and can place frames at chunk boundaries to reliably trigger kernel reads/writes past the declared 8-byte metadata headroom.\nPR:L - AF_XDP socket creation requires CAP_NET_RAW (xsk_create()); per kernel CNA guidance this is Low because unprivileged processes can obtain it inside user/network namespaces (e.g., unshare -Urn).\nUI:N - No victim action is required; the attacker configures their own AF_XDP socket, UMEM, rings, and TX descriptors to trigger the faulty metadata handling during transmit.\nS:U - Impact is confined to kernel processing of attacker-supplied AF_XDP metadata and pinned UMEM frames; it does not cross VM, hypervisor, or IOMMU isolation boundaries.\nC:H - With only 8 bytes registered, the kernel still dereferences xsk_tx_metadata request fields (checksum, launch time) beyond the metadata area; this out-of-bounds read can cross chunk/UMEM boundaries and expose adjacent memory.\nI:H - TX timestamp completion writes through meta-\u003ecompletion.tx_timestamp when only 8 bytes of metadata were reserved, causing an out-of-bounds write past the registered metadata headroom that can corrupt adjacent memory or be leveraged further.\nA:H - Reading or writing metadata fields beyond the registered length at chunk/UMEM edges can access unmapped pages and trigger kernel faults; out-of-bounds kernel accesses in this path can cause oops/panic-level denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:52.464Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/21b8536aee819792f1b4b38b9aacf2a073025d49"
        },
        {
          "url": "https://git.kernel.org/stable/c/642c6e73fce17fdca93a5793c4d22359fda866d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfb9d2976b277e554e28c165e3eff4b4a8ea10bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/1bb30b181d9f0484e141f8411e15ed906d5c6780"
        }
      ],
      "title": "xsk: require at least 16 bytes of TX metadata",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74710",
    "datePublished": "2026-08-22T15:33:07.172Z",
    "dateReserved": "2026-08-15T05:44:03.928Z",
    "dateUpdated": "2026-08-25T05:41:52.464Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-01",
      "epss": "0.00129",
      "percentile": "0.02792"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74710\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:45.743\",\"lastModified\":\"2026-08-25T06:18:55.687\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxsk: require at least 16 bytes of TX metadata\\n\\nAF_XDP accepts a TX metadata length as small as eight bytes, but every\\nsupported request needs the flags plus at least one eight-byte request\\nfield. Such short metadata also lets the kernel read beyond the registered\\narea.\\n\\nRequire 16 bytes rather than sizeof(struct xsk_tx_metadata) to preserve\\ncompatibility with applications that do not use launch-time metadata.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xdp/xdp_umem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"341ac980eab90ac1f6c22ee9f9da83ed9604d899\",\"lessThan\":\"21b8536aee819792f1b4b38b9aacf2a073025d49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"341ac980eab90ac1f6c22ee9f9da83ed9604d899\",\"lessThan\":\"642c6e73fce17fdca93a5793c4d22359fda866d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"341ac980eab90ac1f6c22ee9f9da83ed9604d899\",\"lessThan\":\"cfb9d2976b277e554e28c165e3eff4b4a8ea10bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"341ac980eab90ac1f6c22ee9f9da83ed9604d899\",\"lessThan\":\"1bb30b181d9f0484e141f8411e15ed906d5c6780\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xdp/xdp_umem.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.8\",\"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/1bb30b181d9f0484e141f8411e15ed906d5c6780\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/21b8536aee819792f1b4b38b9aacf2a073025d49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/642c6e73fce17fdca93a5793c4d22359fda866d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cfb9d2976b277e554e28c165e3eff4b4a8ea10bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:55:14+00:00",
      "cve": "CVE-2026-74710",
      "id": "CVE-2026-74710",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xsk: require at least 16 bytes of TX metadata",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74710.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.
  • 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.