CVE-2026-64055 (GCVE-0-2026-64055)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42
VLAI
Title
net: ethernet: cortina: Carry over frag counter
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: cortina: Carry over frag counter The gmac_rx() NAPI poll function assembles packets in an SKB from a ring buffer. If the ring buffer gets completely emptied during a poll cycle, we exit gmac_rx(), but the packet is not yet completely assembled in the SKB, yet the fragment counter frag_nr is reset to zero on the next invocation. Solve this by making the RX fragment counter a part of the port struct, and carry it over between invocations. Reset the fragment counter only right after calling napi_gro_frags(), on error (after calling napi_free_frags()) or if stopping the port. Reset it in some place where not strictly necessary just to emphasize what is going on. This was found by Sashiko during normal patch review.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < df31e3b64455293df1ea89c7da7d5c9bfbcdd253 (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < 7af1fabdee744b7995fe01b30b77dfc397657cb5 (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < 78cf08b3be47c28f07008a76c932bad7cdffa9d8 (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < c373b34877afea61c89e0dd2e38948c624249b9b (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < 46806096f35b8d3dfa2f321ddd77f597edcdb85f (git)
Affected: 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 , < ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 (git)
Create a notification for this product.
Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cortina/gemini.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "df31e3b64455293df1ea89c7da7d5c9bfbcdd253",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "7af1fabdee744b7995fe01b30b77dfc397657cb5",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "78cf08b3be47c28f07008a76c932bad7cdffa9d8",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "7123cf481e21b54eb6adc4cb0d8dc2876aeaee41",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "c373b34877afea61c89e0dd2e38948c624249b9b",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "46806096f35b8d3dfa2f321ddd77f597edcdb85f",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            },
            {
              "lessThan": "ebd8ec2b309e3a447851b456ccaf8fb39f3661e7",
              "status": "affected",
              "version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cortina/gemini.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.258",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: cortina: Carry over frag counter\n\nThe gmac_rx() NAPI poll function assembles packets in an\nSKB from a ring buffer.\n\nIf the ring buffer gets completely emptied during a poll cycle,\nwe exit gmac_rx(), but the packet is not yet completely\nassembled in the SKB, yet the fragment counter frag_nr is\nreset to zero on the next invocation.\n\nSolve this by making the RX fragment counter a part of the\nport struct, and carry it over between invocations.\n\nReset the fragment counter only right after calling\nnapi_gro_frags(), on error (after calling napi_free_frags())\nor if stopping the port.\n\nReset it in some place where not strictly necessary just to\nemphasize what is going on.\n\nThis was found by Sashiko during normal patch review."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:42:52.779Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253"
        },
        {
          "url": "https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5"
        },
        {
          "url": "https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0"
        },
        {
          "url": "https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41"
        },
        {
          "url": "https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f"
        },
        {
          "url": "https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7"
        }
      ],
      "title": "net: ethernet: cortina: Carry over frag counter",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64055",
    "datePublished": "2026-07-19T15:39:37.077Z",
    "dateReserved": "2026-07-19T07:54:57.030Z",
    "dateUpdated": "2026-07-20T13:42:52.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64055",
      "date": "2026-07-21",
      "epss": "0.00521",
      "percentile": "0.40846"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64055\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:45.930\",\"lastModified\":\"2026-07-20T15:17:05.973\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ethernet: cortina: Carry over frag counter\\n\\nThe gmac_rx() NAPI poll function assembles packets in an\\nSKB from a ring buffer.\\n\\nIf the ring buffer gets completely emptied during a poll cycle,\\nwe exit gmac_rx(), but the packet is not yet completely\\nassembled in the SKB, yet the fragment counter frag_nr is\\nreset to zero on the next invocation.\\n\\nSolve this by making the RX fragment counter a part of the\\nport struct, and carry it over between invocations.\\n\\nReset the fragment counter only right after calling\\nnapi_gro_frags(), on error (after calling napi_free_frags())\\nor if stopping the port.\\n\\nReset it in some place where not strictly necessary just to\\nemphasize what is going on.\\n\\nThis was found by Sashiko during normal patch review.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/ethernet/cortina/gemini.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"df31e3b64455293df1ea89c7da7d5c9bfbcdd253\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"7af1fabdee744b7995fe01b30b77dfc397657cb5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"78cf08b3be47c28f07008a76c932bad7cdffa9d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"7123cf481e21b54eb6adc4cb0d8dc2876aeaee41\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"c373b34877afea61c89e0dd2e38948c624249b9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"46806096f35b8d3dfa2f321ddd77f597edcdb85f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88\",\"lessThan\":\"ebd8ec2b309e3a447851b456ccaf8fb39f3661e7\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/ethernet/cortina/gemini.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:04:28+00:00",
      "cve": "CVE-2026-64055",
      "id": "CVE-2026-64055",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ethernet: cortina: Carry over frag counter",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64055.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.