{"id":"CVE-2026-90221","state":"PUBLISHED","title":"nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing\n\nnci_core_init_rsp_packet_v1() and nci_core_init_rsp_packet_v2() parse\nthe CORE_INIT_RSP packet without validating that the skb contains\nenough data. A malformed response (e.g. injected via virtual_ncidev)\ncan declare a large num_supported_rf_interfaces while providing\ninsufficient data, causing reads of uninitialized slab memory. This\nis later used in nci_init_complete_req(), triggering a KMSAN\nuninit-value warning.\n\nAdd skb length checks before accessing packet fields:\n- Validate the skb has at least 1 byte for the status field.\n- Validate the skb can hold the fixed-size header before parsing.\n- In v2, bounds-check each variable-length rf_interface entry and its\n  extension parameters within the parsing loop.\n- In v1, verify the skb is large enough for both the variable-length\n  rf_interfaces array and the trailing rsp_2 structure.","publishedAt":"2026-09-17T16:07:32.070Z","updatedAt":"2026-10-19T08:59:57.703Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"baed3fdf6ed2195c56f25ae18a086b938dcd3983","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"2f434478771a4ebdd535033561c0590bcde39753","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"4f0483bbcdaccc9d4aee30df7351863334cecfa7","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"7d44b897bff84edcd4814899314d661ad4956a8e","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"d56575a2595ee1f597f39e8a1cfb67ed3501678d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/nci/rsp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","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":["net/nfc/nci/rsp.c"]}],"references":["https://git.kernel.org/stable/c/baed3fdf6ed2195c56f25ae18a086b938dcd3983","https://git.kernel.org/stable/c/2f434478771a4ebdd535033561c0590bcde39753","https://git.kernel.org/stable/c/5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31","https://git.kernel.org/stable/c/bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e","https://git.kernel.org/stable/c/4f0483bbcdaccc9d4aee30df7351863334cecfa7","https://git.kernel.org/stable/c/7d44b897bff84edcd4814899314d661ad4956a8e","https://git.kernel.org/stable/c/d56575a2595ee1f597f39e8a1cfb67ed3501678d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90221.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90221","state":"PUBLISHED","datePublished":"2026-09-17T16:07:32.070Z","dateUpdated":"2026-10-19T08:59:57.703Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.793Z"},"containers":{"cna":{"title":"nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing\n\nnci_core_init_rsp_packet_v1() and nci_core_init_rsp_packet_v2() parse\nthe CORE_INIT_RSP packet without validating that the skb contains\nenough data. A malformed response (e.g. injected via virtual_ncidev)\ncan declare a large num_supported_rf_interfaces while providing\ninsufficient data, causing reads of uninitialized slab memory. This\nis later used in nci_init_complete_req(), triggering a KMSAN\nuninit-value warning.\n\nAdd skb length checks before accessing packet fields:\n- Validate the skb has at least 1 byte for the status field.\n- Validate the skb can hold the fixed-size header before parsing.\n- In v2, bounds-check each variable-length rf_interface entry and its\n  extension parameters within the parsing loop.\n- In v1, verify the skb is large enough for both the variable-length\n  rf_interfaces array and the trailing rsp_2 structure."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"baed3fdf6ed2195c56f25ae18a086b938dcd3983","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"2f434478771a4ebdd535033561c0590bcde39753","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"4f0483bbcdaccc9d4aee30df7351863334cecfa7","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"7d44b897bff84edcd4814899314d661ad4956a8e","versionType":"git"},{"version":"bcd684aace34fedbd473fbd9b21ed06b0c2d2212","status":"affected","lessThan":"d56575a2595ee1f597f39e8a1cfb67ed3501678d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/nci/rsp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","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":["net/nfc/nci/rsp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/baed3fdf6ed2195c56f25ae18a086b938dcd3983"},{"url":"https://git.kernel.org/stable/c/2f434478771a4ebdd535033561c0590bcde39753"},{"url":"https://git.kernel.org/stable/c/5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31"},{"url":"https://git.kernel.org/stable/c/bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e"},{"url":"https://git.kernel.org/stable/c/4f0483bbcdaccc9d4aee30df7351863334cecfa7"},{"url":"https://git.kernel.org/stable/c/7d44b897bff84edcd4814899314d661ad4956a8e"},{"url":"https://git.kernel.org/stable/c/d56575a2595ee1f597f39e8a1cfb67ed3501678d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:59:57.703Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}