{"id":"CVE-2026-63958","state":"PUBLISHED","title":"usb: typec: ucsi: validate connector number in ucsi_connector_change()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_connector_change()\n\nThe connector number in a UCSI CCI notification is a 7-bit field\nsupplied by the PPM.  ucsi_connector_change() uses it to index the\nucsi->connector[] array without checking it against the number of\nconnectors the PPM reported at init time, so a buggy or malicious PPM\n(EC firmware, or an I2C-attached UCSI controller on the ccg / stm32g0 /\nglink transports) can drive schedule_work() on memory past the end of\nthe array.\n\nReject connector numbers that are zero or exceed cap.num_connectors\nbefore dereferencing the array.","publishedAt":"2026-07-19T14:55:48.835Z","updatedAt":"2026-07-20T06:41:38.075Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"cea949203faef9cb783adc7b978cce056271e057","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"156b6f0aec6108909b0c4aedc78865b12766b347","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"bd24d92af4ae021b6209f28e9a57e1bf2260d4fd","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"0edd1e21587b0483c7ceb993b9fb9668bbef7433","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"5af2719b460ab904c504fc069d1dd2a3aa2b22b0","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"288a81a8507052bcfbf884d39a463c44c42c5fd9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/typec/ucsi/ucsi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.13","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/typec/ucsi/ucsi.c"]}],"references":["https://git.kernel.org/stable/c/cea949203faef9cb783adc7b978cce056271e057","https://git.kernel.org/stable/c/156b6f0aec6108909b0c4aedc78865b12766b347","https://git.kernel.org/stable/c/bd24d92af4ae021b6209f28e9a57e1bf2260d4fd","https://git.kernel.org/stable/c/0edd1e21587b0483c7ceb993b9fb9668bbef7433","https://git.kernel.org/stable/c/5af2719b460ab904c504fc069d1dd2a3aa2b22b0","https://git.kernel.org/stable/c/288a81a8507052bcfbf884d39a463c44c42c5fd9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63958.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63958","state":"PUBLISHED","datePublished":"2026-07-19T14:55:48.835Z","dateUpdated":"2026-07-20T06:41:38.075Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.023Z"},"containers":{"cna":{"title":"usb: typec: ucsi: validate connector number in ucsi_connector_change()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_connector_change()\n\nThe connector number in a UCSI CCI notification is a 7-bit field\nsupplied by the PPM.  ucsi_connector_change() uses it to index the\nucsi->connector[] array without checking it against the number of\nconnectors the PPM reported at init time, so a buggy or malicious PPM\n(EC firmware, or an I2C-attached UCSI controller on the ccg / stm32g0 /\nglink transports) can drive schedule_work() on memory past the end of\nthe array.\n\nReject connector numbers that are zero or exceed cap.num_connectors\nbefore dereferencing the array."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"cea949203faef9cb783adc7b978cce056271e057","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"156b6f0aec6108909b0c4aedc78865b12766b347","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"bd24d92af4ae021b6209f28e9a57e1bf2260d4fd","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"0edd1e21587b0483c7ceb993b9fb9668bbef7433","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"5af2719b460ab904c504fc069d1dd2a3aa2b22b0","versionType":"git"},{"version":"c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f","status":"affected","lessThan":"288a81a8507052bcfbf884d39a463c44c42c5fd9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/typec/ucsi/ucsi.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.13","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/typec/ucsi/ucsi.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cea949203faef9cb783adc7b978cce056271e057"},{"url":"https://git.kernel.org/stable/c/156b6f0aec6108909b0c4aedc78865b12766b347"},{"url":"https://git.kernel.org/stable/c/bd24d92af4ae021b6209f28e9a57e1bf2260d4fd"},{"url":"https://git.kernel.org/stable/c/0edd1e21587b0483c7ceb993b9fb9668bbef7433"},{"url":"https://git.kernel.org/stable/c/5af2719b460ab904c504fc069d1dd2a3aa2b22b0"},{"url":"https://git.kernel.org/stable/c/288a81a8507052bcfbf884d39a463c44c42c5fd9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-20T06:41:38.075Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.12.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"7.0.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}