FKIE_CVE-2026-68354

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-19 17:20
Severity
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0177e578d7a885037b0fb82286c12e9d0360cc10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a219b2a01b4fe93706717e3bcacf7f62967b26f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1aaf16031d65ccd4576451a79f7dabbec994c111
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22e05b8ddbcf7d22c7f1598786e86635547e554d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/268cea3800eda5fa3ee04a49ee2973b8766a8df3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7d633c7c92321be98724b1d365e8ce507f2f349
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d52a13adbb8ccbab99cd3bad36804e87d8b5c052
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firewire/net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1aaf16031d65ccd4576451a79f7dabbec994c111",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "0a219b2a01b4fe93706717e3bcacf7f62967b26f",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "268cea3800eda5fa3ee04a49ee2973b8766a8df3",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "b7d633c7c92321be98724b1d365e8ce507f2f349",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "22e05b8ddbcf7d22c7f1598786e86635547e554d",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "0177e578d7a885037b0fb82286c12e9d0360cc10",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            },
            {
              "lessThan": "d52a13adbb8ccbab99cd3bad36804e87d8b5c052",
              "status": "affected",
              "version": "c76acec6d55107b652a37c90b36c00bc8b04dabb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firewire/net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.31"
            },
            {
              "lessThan": "2.6.31",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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\u0027s 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."
    }
  ],
  "id": "CVE-2026-68354",
  "lastModified": "2026-08-19T17:20:45.020",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-10T13:20:27.820",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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