{"api_version":"1","generated_at":"2026-07-23T23:10:34+00:00","cve":"CVE-2026-63964","urls":{"html":"https://cve.report/CVE-2026-63964","api":"https://cve.report/api/cve/CVE-2026-63964.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63964","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63964"},"summary":{"title":"usb: typec: ucsi: ccg: reject firmware images without a ':' record header","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:15","updated_at":"2026-07-20 07:16:41"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213","name":"https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa","name":"https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3","name":"https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb","name":"https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b","name":"https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273","name":"https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450","name":"https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e","name":"https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63964","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63964","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 b41dfc033fe594e152648050e95b9489cd53e9e3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 2f395ca1263bd181995eb829f5943a83a20db213 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 6526f8684f72391138353642af908803ba70795e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 3f432b8203066c26770fe6ea591361f10021dd6b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 a38ed87818b2419090fb1a6338ddce6842b65dfa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 c8460de584fe5415d212cfdd127d4db90835a450 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5c9ae5a87573d38cfc4c740aafda2fa6ce06e401 d7486952bf74e546ee3748fb14b2d07881fa6273 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63964","cve":"CVE-2026-63964","epss":"0.002100000","percentile":"0.113690000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/typec/ucsi/ucsi_ccg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b41dfc033fe594e152648050e95b9489cd53e9e3","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"2f395ca1263bd181995eb829f5943a83a20db213","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"6526f8684f72391138353642af908803ba70795e","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"3f432b8203066c26770fe6ea591361f10021dd6b","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"a38ed87818b2419090fb1a6338ddce6842b65dfa","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"c8460de584fe5415d212cfdd127d4db90835a450","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"},{"lessThan":"d7486952bf74e546ee3748fb14b2d07881fa6273","status":"affected","version":"5c9ae5a87573d38cfc4c740aafda2fa6ce06e401","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/typec/ucsi/ucsi_ccg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.2"},{"lessThan":"5.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"5.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-07-20T06:41:45.132Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b41dfc033fe594e152648050e95b9489cd53e9e3"},{"url":"https://git.kernel.org/stable/c/2f395ca1263bd181995eb829f5943a83a20db213"},{"url":"https://git.kernel.org/stable/c/6526f8684f72391138353642af908803ba70795e"},{"url":"https://git.kernel.org/stable/c/3f432b8203066c26770fe6ea591361f10021dd6b"},{"url":"https://git.kernel.org/stable/c/c4ee519b06389e59ba2d6aa722fcc4a02a8bbcbb"},{"url":"https://git.kernel.org/stable/c/a38ed87818b2419090fb1a6338ddce6842b65dfa"},{"url":"https://git.kernel.org/stable/c/c8460de584fe5415d212cfdd127d4db90835a450"},{"url":"https://git.kernel.org/stable/c/d7486952bf74e546ee3748fb14b2d07881fa6273"}],"title":"usb: typec: ucsi: ccg: reject firmware images without a ':' record header","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63964","datePublished":"2026-07-19T14:55:53.115Z","dateReserved":"2026-07-19T07:54:57.024Z","dateUpdated":"2026-07-20T06:41:45.132Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:15","lastModifiedDate":"2026-07-20 07:16:41","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63964","Ordinal":"1","Title":"usb: typec: ucsi: ccg: reject firmware images without a ':' reco","CVE":"CVE-2026-63964","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63964","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"usb: typec: ucsi: ccg: reject firmware images without a ':' reco"}]}}}