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CVE-2026-68354

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: firewire: net: Fix fragmented datagram reassembly fwnet_frag_new() keeps a sorted list of received fragments for a partial datagram. When a new fragment is adjacent to an existing fragment, the code checks whether the new fragment also closes the gap to the next or previous list entry. Those neighbor lookups currently assume that the current fragment always has a real next or previous fragment. At a list edge, the next or previous entry is the list head, not a struct fwnet_fragment_info. The gap checks also compare against the old edge of the current fragment instead of the edge after adding the new fragment. As a result, a fragment that bridges two existing ranges may leave two adjacent ranges unmerged, so fwnet_pd_is_complete() can miss a complete datagram. Check for the list head before looking up the neighboring fragment, and compare the neighbor against the new fragment's far edge when deciding whether to merge all three ranges. This issue was found by a static analysis checker and confirmed by manual source review.

Severity
HIGH
CVSS score
8.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-10 13:20:27.820000
Last modified
2026-10-19 22:17:14.737000
View original CVE JSON 
{
  "id": "CVE-2026-68354",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-10T13:20:27.820",
  "lastModified": "2026-10-19T22:17:14.737",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirewire: net: Fix fragmented datagram reassembly\n\nfwnet_frag_new() keeps a sorted list of received fragments for a partial\ndatagram. When a new fragment is adjacent to an existing fragment, the\ncode checks whether the new fragment also closes the gap to the next or\nprevious list entry.\n\nThose neighbor lookups currently assume that the current fragment always\nhas a real next or previous fragment. At a list edge, the next or\nprevious entry is the list head, not a struct fwnet_fragment_info.\n\nThe gap checks also compare against the old edge of the current fragment\ninstead of the edge after adding the new fragment. As a result, a\nfragment that bridges two existing ranges may leave two adjacent ranges\nunmerged, so fwnet_pd_is_complete() can miss a complete datagram.\n\nCheck for the list head before looking up the neighboring fragment, and\ncompare the neighbor against the new fragment's far edge when deciding\nwhether to merge all three ranges.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/firewire/net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "1aaf16031d65ccd4576451a79f7dabbec994c111",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "0a219b2a01b4fe93706717e3bcacf7f62967b26f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "268cea3800eda5fa3ee04a49ee2973b8766a8df3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "b7d633c7c92321be98724b1d365e8ce507f2f349",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "22e05b8ddbcf7d22c7f1598786e86635547e554d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "0177e578d7a885037b0fb82286c12e9d0360cc10",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "lessThan": "d52a13adbb8ccbab99cd3bad36804e87d8b5c052",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/firewire/net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2.6.31",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "2.6.31",
              "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": "6.6.148",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.101",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.42",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.6",
              "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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T15:47:28.340038Z",
          "id": "CVE-2026-68354",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0177e578d7a885037b0fb82286c12e9d0360cc10",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0a219b2a01b4fe93706717e3bcacf7f62967b26f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1aaf16031d65ccd4576451a79f7dabbec994c111",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/22e05b8ddbcf7d22c7f1598786e86635547e554d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/268cea3800eda5fa3ee04a49ee2973b8766a8df3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b7d633c7c92321be98724b1d365e8ce507f2f349",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d52a13adbb8ccbab99cd3bad36804e87d8b5c052",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}