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firewire: net: Fix fragmented datagram reassembly

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-68354

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68354

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "drivers/firewire/net.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.31"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.31",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/firewire/net.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68354

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41705 · Revision 1
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Publisher date
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