{"id":"CVE-2026-90226","state":"PUBLISHED","title":"nfc: llcp: avoid userspace overflow on invalid optlen","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: avoid userspace overflow on invalid optlen\n\nnfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so\nthe kernel always stores 4 bytes regardless of the caller-supplied\noptlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length\nreported back to userspace; it does not constrain the store. A call with\noptlen < 4 therefore writes past the user buffer, violating the\ngetsockopt(2) contract for all five supported optnames.\n\nReject any call with optlen < sizeof(u32) up front. 'len' is int, so a\nplain size comparison would promote a negative optlen to size_t and slip\npast the check; an explicit 'len < 0' test is added first to catch\nnegative values before the size compare.","publishedAt":"2026-09-17T16:07:35.322Z","updatedAt":"2026-10-19T09:00:02.755Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"42859562b7cc4313a84a584f338118edb7087066","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"598dcd53c52f8eeb9dd5382198c03960d5d40fcd","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"7e40f2f5e7bc06c3ddef781180ce4f7994176547","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"35573c6cb081af2f4a7caeea291302aca5484526","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"b4c5abaea06292e1dddb70eac1b51589b32c77a3","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"bd6f1277b62bc1df348ca21739df2bc546fcd493","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"99985bfa8336fadcc69190ba2dcbd5386af3d661","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_sock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","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/llcp_sock.c"]}],"references":["https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066","https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd","https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547","https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526","https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3","https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67","https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493","https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90226.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90226","state":"PUBLISHED","datePublished":"2026-09-17T16:07:35.322Z","dateUpdated":"2026-10-19T09:00:02.755Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.794Z"},"containers":{"cna":{"title":"nfc: llcp: avoid userspace overflow on invalid optlen","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: avoid userspace overflow on invalid optlen\n\nnfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so\nthe kernel always stores 4 bytes regardless of the caller-supplied\noptlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length\nreported back to userspace; it does not constrain the store. A call with\noptlen < 4 therefore writes past the user buffer, violating the\ngetsockopt(2) contract for all five supported optnames.\n\nReject any call with optlen < sizeof(u32) up front. 'len' is int, so a\nplain size comparison would promote a negative optlen to size_t and slip\npast the check; an explicit 'len < 0' test is added first to catch\nnegative values before the size compare."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"42859562b7cc4313a84a584f338118edb7087066","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"598dcd53c52f8eeb9dd5382198c03960d5d40fcd","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"7e40f2f5e7bc06c3ddef781180ce4f7994176547","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"35573c6cb081af2f4a7caeea291302aca5484526","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"b4c5abaea06292e1dddb70eac1b51589b32c77a3","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"bd6f1277b62bc1df348ca21739df2bc546fcd493","versionType":"git"},{"version":"26fd76cab2e61cedc5c25f7151fb31b57ddc53c7","status":"affected","lessThan":"99985bfa8336fadcc69190ba2dcbd5386af3d661","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/nfc/llcp_sock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.10","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","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/llcp_sock.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066"},{"url":"https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd"},{"url":"https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547"},{"url":"https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526"},{"url":"https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3"},{"url":"https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67"},{"url":"https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493"},{"url":"https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:00:02.755Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}