{"schema_version":"1.9.0","id":"CVE-2026-63964","published":"2026-07-19T14:55:53.115Z","modified":"2026-08-31T18:26:05.149243592Z","related":["SUSE-SU-2026:23066-1","SUSE-SU-2026:23068-1","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23221-1","SUSE-SU-2026:23231-1","SUSE-SU-2026:23237-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3790-1","SUSE-SU-2026:3810-1","openSUSE-SU-2026:21555-1"],"summary":"usb: typec: ucsi: ccg: reject firmware images without a ':' record header","details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401"},{"fixed":"b41dfc033fe594e152648050e95b9489cd53e9e3"},{"fixed":"2f395ca1263bd181995eb829f5943a83a20db213"},{"fixed":"6526f8684f72391138353642af908803ba70795e"},{"fixed":"3f432b8203066c26770fe6ea591361f10021dd6b"},{"fixed":"c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb"},{"fixed":"a38ed87818b2419090fb1a6338ddce6842b65dfa"},{"fixed":"c8460de584fe5415d212cfdd127d4db90835a450"},{"fixed":"d7486952bf74e546ee3748fb14b2d07881fa6273"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63964.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.2.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63964.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63964.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63964"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63964.json"}}