{"id":"CVE-2026-90226","title":"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 regardle…","summary":"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 regardle…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 42859562b7cc4313a84a584f338118edb7087066","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 598dcd53c52f8eeb9dd5382198c03960d5d40fcd","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 7e40f2f5e7bc06c3ddef781180ce4f7994176547","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 35573c6cb081af2f4a7caeea291302aca5484526","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < b4c5abaea06292e1dddb70eac1b51589b32c77a3","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < bd6f1277b62bc1df348ca21739df2bc546fcd493","Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 99985bfa8336fadcc69190ba2dcbd5386af3d661","Linux 3.10"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:18.270","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90226","references":[{"url":"https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-17T16:21:47.853Z","epss":0.0021,"epssPercentile":0.10003,"slug":"CVE-2026-90226","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}