{"api_version":"1","generated_at":"2026-07-23T12:37:28+00:00","cve":"CVE-2026-64055","urls":{"html":"https://cve.report/CVE-2026-64055","api":"https://cve.report/api/cve/CVE-2026-64055.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64055","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64055"},"summary":{"title":"net: ethernet: cortina: Carry over frag counter","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:45","updated_at":"2026-07-20 15:17:05"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0","name":"https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5","name":"https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8","name":"https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f","name":"https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b","name":"https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253","name":"https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7","name":"https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41","name":"https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64055","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64055","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 df31e3b64455293df1ea89c7da7d5c9bfbcdd253 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 7af1fabdee744b7995fe01b30b77dfc397657cb5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 78cf08b3be47c28f07008a76c932bad7cdffa9d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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"},"nvd":{"publishedDate":"2026-07-19 16:17:45","lastModifiedDate":"2026-07-20 15:17:05","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64055","Ordinal":"1","Title":"net: ethernet: cortina: Carry over frag counter","CVE":"CVE-2026-64055","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64055","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"net: ethernet: cortina: Carry over frag counter"}]}}}