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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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xdp/xdp_umem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "341ac980eab90ac1f6c22ee9f9da83ed9604d899",
              "versionType": "git"
            },
            {
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
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                  "versionStartIncluding": "6.8",
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                },
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                  "vulnerable": true
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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": [
        {
          "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": {
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      "date": "2026-09-18",
      "epss": "0.00129",
      "percentile": "0.02871"
    },
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                "programFiles": [
                  "net/xdp/xdp_umem.c"
                ],
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        "cveTags": [],
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          {
            "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."
          }
        ],
        "id": "CVE-2026-74710",
        "lastModified": "2026-08-25T06:18:55.687",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "published": "2026-08-22T16:16:45.743",
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        "vulnStatus": "Received"
      }
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      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:16:06Z",
      "cve": "CVE-2026-74710",
      "id": "CVE-2026-74710",
      "initial_release_date": "2026-08-23T00:04:11Z",
      "product_status:known_affected": "118",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74710",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74710.json",
      "version": "6"
    }
  }
}



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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

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.