{"id":"CVE-2026-93119","state":"PUBLISHED","title":"usb: ljca: bound bank_num in ljca_enumerate_gpio()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: ljca: bound bank_num in ljca_enumerate_gpio()\n\nljca_enumerate_gpio() reads desc->bank_num from the device and loops\nvalid_pin[i] = get_unaligned_le32(...) for i < bank_num. valid_pin[]\nholds only LJCA_MAX_GPIO_NUM / 32 = 2 entries.\n\nTwo checks run before the loop. The reply length must match\nstruct_size(desc, bank_desc, bank_num). The product\npins_per_bank * bank_num must not exceed LJCA_MAX_GPIO_NUM. Neither one\nbounds bank_num against the size of valid_pin[]. The reply is capped at\nLJCA_MAX_PAYLOAD_SIZE (60) bytes, so the struct_size check limits\nbank_num to 9. A device that reports bank_num 9 with pins_per_bank 7\nstill passes both checks. gpio_num is 63 and the reply is 56 bytes. The\nloop then writes nine u32 into the two entry array and overruns\nvalid_pin[] on the stack.\n\nA broken or malicious LJCA device can therefore overflow the stack.\nReject a bank_num that does not fit valid_pin[].","publishedAt":"2026-09-17T16:11:25.867Z","updatedAt":"2026-10-19T09:05:52.849Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"0069593170a3d177de793c9a0b36989c4f069111","versionType":"git"},{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"aed958c4f784a29cf42abb3e54af51a16bddde46","versionType":"git"},{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"9c4bc8f7426aa001387800bf0140bfc5087a6de3","versionType":"git"},{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"dd9483726d0f16c1a56879c3edb65128259a4e2b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/usb-ljca.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.7","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/usb-ljca.c"]}],"references":["https://git.kernel.org/stable/c/0069593170a3d177de793c9a0b36989c4f069111","https://git.kernel.org/stable/c/aed958c4f784a29cf42abb3e54af51a16bddde46","https://git.kernel.org/stable/c/9c4bc8f7426aa001387800bf0140bfc5087a6de3","https://git.kernel.org/stable/c/dd9483726d0f16c1a56879c3edb65128259a4e2b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93119.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93119","state":"PUBLISHED","datePublished":"2026-09-17T16:11:25.867Z","dateUpdated":"2026-10-19T09:05:52.849Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.086Z"},"containers":{"cna":{"title":"usb: ljca: bound bank_num in ljca_enumerate_gpio()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: ljca: bound bank_num in ljca_enumerate_gpio()\n\nljca_enumerate_gpio() reads desc->bank_num from the device and loops\nvalid_pin[i] = get_unaligned_le32(...) for i < bank_num. valid_pin[]\nholds only LJCA_MAX_GPIO_NUM / 32 = 2 entries.\n\nTwo checks run before the loop. The reply length must match\nstruct_size(desc, bank_desc, bank_num). The product\npins_per_bank * bank_num must not exceed LJCA_MAX_GPIO_NUM. Neither one\nbounds bank_num against the size of valid_pin[]. The reply is capped at\nLJCA_MAX_PAYLOAD_SIZE (60) bytes, so the struct_size check limits\nbank_num to 9. A device that reports bank_num 9 with pins_per_bank 7\nstill passes both checks. gpio_num is 63 and the reply is 56 bytes. The\nloop then writes nine u32 into the two entry array and overruns\nvalid_pin[] on the stack.\n\nA broken or malicious LJCA device can therefore overflow the stack.\nReject a bank_num that does not fit valid_pin[]."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"0069593170a3d177de793c9a0b36989c4f069111","versionType":"git"},{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"aed958c4f784a29cf42abb3e54af51a16bddde46","versionType":"git"},{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"9c4bc8f7426aa001387800bf0140bfc5087a6de3","versionType":"git"},{"version":"acd6199f195d6de814ac4090ce0864a613b1580e","status":"affected","lessThan":"dd9483726d0f16c1a56879c3edb65128259a4e2b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/usb-ljca.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.7","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/misc/usb-ljca.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0069593170a3d177de793c9a0b36989c4f069111"},{"url":"https://git.kernel.org/stable/c/aed958c4f784a29cf42abb3e54af51a16bddde46"},{"url":"https://git.kernel.org/stable/c/9c4bc8f7426aa001387800bf0140bfc5087a6de3"},{"url":"https://git.kernel.org/stable/c/dd9483726d0f16c1a56879c3edb65128259a4e2b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:05:52.849Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}