{"cve":"CVE-2026-63964","nvd":{"published":"2026-07-19T16:17:15.370","modified":"2026-10-30T17:29:01.400","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: ccg: reject firmware images without a ':' record header\n\ndo_flash() locates the first .cyacd record with\n\n\tp = strnchr(fw->data, fw->size, ':');\n\twhile (p < eof) {\n\t\ts = strnchr(p + 1, eof - p - 1, ':');\n\t\t...\n\t}\n\nIf the firmware image contains no ':' byte,  strnchr() returns NULL.\nNULL compares less than the valid kernel pointer eof, so the loop body\nruns and strnchr() is called with p + 1 == (void *)1 and a length of\nroughly (unsigned long)eof, causing a wonderful crash.\n\nThe not_signed_fw fallthrough earlier in do_flash() and the chip-state\nbranches in ccg_fw_update_needed() allow an unsigned blob to reach this\nloop, so a root user who can place a crafted file under /lib/firmware\nand write the do_flash sysfs attribute can trigger the oops.\n\nBail out with -EINVAL when the initial strnchr() returns NULL.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213","https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b","https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e","https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa","https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-30T17:45:53.525042316+00:00"},"epss":{"cve":"CVE-2026-63964","score":0.00211,"percentile":0.11341,"date":"2026-10-30"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}