{"id":"CVE-2026-90226","published":"2026-09-17T17:17:18.270","lastModified":"2026-09-17T17:17:18.270","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526","tags":[]},{"url":"https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066","tags":[]},{"url":"https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd","tags":[]},{"url":"https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547","tags":[]},{"url":"https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67","tags":[]},{"url":"https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661","tags":[]},{"url":"https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3","tags":[]},{"url":"https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}