CVE-2026-68123 (GCVE-0-2026-68123)
Vulnerability from cvelistv5
Published
2026-08-10 11:58
Modified
2026-10-19 20:58
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/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: openvswitch: fix GSO userspace truncation underflow OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb length in OVS_CB(skb)->cutlen. When a later userspace action segments a GSO skb, queue_gso_packets() reuses that delta for each smaller segment. A segment can then reach queue_userspace_packet() with cutlen greater than skb->len, underflowing the length passed to skb_zerocopy(). Store the maximum preserved length instead and bound each consumer against the current skb length. Use U32_MAX as the no-truncation sentinel so the value remains valid if skb geometry changes before a consumer handles it.
References
Impacted products
Vendor Product Version
Linux Linux Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
Version: f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1
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When a later userspace action segments a\\nGSO skb, queue_gso_packets() reuses that delta for each smaller segment.\\nA segment can then reach queue_userspace_packet() with cutlen greater\\nthan skb-\u003elen, underflowing the length passed to skb_zerocopy().\\n\\nStore the maximum preserved length instead and bound each consumer\\nagainst the current skb length. Use U32_MAX as the no-truncation\\nsentinel so the value remains valid if skb geometry changes before a\\nconsumer handles it.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:29:34.391Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68123\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:51.936Z\", \"dateReserved\": \"2026-07-30T09:28:09.369Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T11:58:43.727Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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