{"id":"CVE-2026-64055","summary":"net: ethernet: cortina: Carry over frag counter","details":"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.","modified":"2026-07-22T05:29:40.066333610Z","published":"2026-07-19T15:39:37.077Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64055.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64055.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64055"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88"},{"fixed":"df31e3b64455293df1ea89c7da7d5c9bfbcdd253"},{"fixed":"7af1fabdee744b7995fe01b30b77dfc397657cb5"},{"fixed":"75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0"},{"fixed":"78cf08b3be47c28f07008a76c932bad7cdffa9d8"},{"fixed":"7123cf481e21b54eb6adc4cb0d8dc2876aeaee41"},{"fixed":"c373b34877afea61c89e0dd2e38948c624249b9b"},{"fixed":"46806096f35b8d3dfa2f321ddd77f597edcdb85f"},{"fixed":"ebd8ec2b309e3a447851b456ccaf8fb39f3661e7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64055.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.16.0"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64055.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}