CVE-2026-74559 (GCVE-0-2026-74559)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-17 05:21
VLAI
Title
xsk: drain continuation descs after overflow in xsk_build_skb()
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: drain continuation descs after overflow in xsk_build_skb() Fix generic xmit path multi-buffer logic when packets are either too big (count of descriptors exceed MAX_SKB_FRAGS) or an invalid descriptor is included in fragmented packet. Introduce xdp_sock::drain_cont and act upon this flag - when it is set, keep on consuming descriptors from AF_XDP Tx ring and put them directly onto Cq. Previously these descriptors were silently lost and could never be reached again.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cf24f5a5feeaae34c1a34d1e04f8ac697290427a , < ceb00cb87a22c42d20c39336213db2b843ca9e34 (git)
Affected: cf24f5a5feeaae34c1a34d1e04f8ac697290427a , < 5e94d74e4f3baebaa083288f33b4be7ce0a34982 (git)
Affected: cf24f5a5feeaae34c1a34d1e04f8ac697290427a , < bd44a6dcd4248883de90f5dad53ae80066e27096 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/xdp_sock.h",
            "net/xdp/xsk.c"
          ],
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              "versionType": "git"
            },
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              "versionType": "git"
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "6.6"
            },
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              "version": "6.18.44",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
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              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: drain continuation descs after overflow in xsk_build_skb()\n\nFix generic xmit path multi-buffer logic when packets are either too big\n(count of descriptors exceed MAX_SKB_FRAGS) or an invalid descriptor is\nincluded in fragmented packet. Introduce xdp_sock::drain_cont and act\nupon this flag - when it is set, keep on consuming descriptors from\nAF_XDP Tx ring and put them directly onto Cq. Previously these\ndescriptors were silently lost and could never be reached again."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:21:46.240Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ceb00cb87a22c42d20c39336213db2b843ca9e34"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e94d74e4f3baebaa083288f33b4be7ce0a34982"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd44a6dcd4248883de90f5dad53ae80066e27096"
        }
      ],
      "title": "xsk: drain continuation descs after overflow in xsk_build_skb()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74559",
    "datePublished": "2026-08-15T12:28:03.279Z",
    "dateReserved": "2026-08-15T05:44:03.916Z",
    "dateUpdated": "2026-08-17T05:21:46.240Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74559",
      "date": "2026-08-18",
      "epss": "0.00166",
      "percentile": "0.06307"
    },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-15T23:50:15Z",
      "cve": "CVE-2026-74559",
      "id": "CVE-2026-74559",
      "initial_release_date": "2026-08-15T23:50:15Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74559",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74559.json",
      "version": "2"
    }
  }
}



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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.