{"id":"CVE-2026-64540","title":"kernel: usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup() (CVE-2026-64540)","summary":"A flaw was found in the Linux kernel's GeneLink (GL620A) USB network driver. A malicious GeneLink device can send specially crafted Universal Serial Bus (USB) packets that cause an out-of-bounds read vulnerability. This can lead to the dis…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-125","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9"],"published":"2026-07-27","updated":"2026-10-23","sourceUpdated":"2026-10-23T11:18:35+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64540.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64540.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64540"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507802"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64540"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64540"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072735-CVE-2026-64540-d315@gregkh/T"},{"url":"https://git.kernel.org/stable/c/255d03551f94c7bdd86c7d9181a70b21917d829f"},{"url":"https://git.kernel.org/stable/c/4359376e6238d89977a35086e47ca3b07f43e850"},{"url":"https://git.kernel.org/stable/c/8624e179fa3ce23c2fbd1a198ce30764b73f054a"},{"url":"https://git.kernel.org/stable/c/573418f7ea8f859a841417eb4b915594094fd967"},{"url":"https://git.kernel.org/stable/c/0575599e451aff3c5329922562374a2cab25fc51"},{"url":"https://git.kernel.org/stable/c/0a7d9c7c5f1f208c523abbb4db6aea7bc1fad3db"},{"url":"https://git.kernel.org/stable/c/3ef79fa3860e644c8de7834fa7300e1c58f38862"},{"url":"https://git.kernel.org/stable/c/8ff7f2a6da4fccaa5cc9be7251a24e71e29fbd1a"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00275,"epssPercentile":0.19773,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:42:07.103763Z"},"scores":{"vendor":5.5,"cna":8.1},"ingestedAt":"2026-10-16T17:24:46.830Z","slug":"CVE-2026-64540","body":"## Overview\n\nA flaw was found in the Linux kernel's GeneLink (GL620A) USB network driver. A malicious GeneLink device can send specially crafted Universal Serial Bus (USB) packets that cause an out-of-bounds read vulnerability. This can lead to the disclosure of sensitive kernel memory, potentially revealing confidential system information. No special privileges are required for an attacker to exploit this vulnerability.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64540.json)\n\n**kernel: usbnet: gl620a: fix out-of-bounds read in genelink_rx_fixup()** — rated Moderate by Red Hat. Released 2026-07-27, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":228077,"id":"CVE-2026-64540","ts":1792758071345,"field":"cvss","old":"8.1","new":"5.5"},{"seq":228076,"id":"CVE-2026-64540","ts":1792758071345,"field":"severity","old":"high","new":"medium"}]}