CVE-2026-90226

Summary

In the Linux kernel, the following vulnerability has been resolved:

nfc: llcp: avoid userspace overflow on invalid optlen

nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so the kernel always stores 4 bytes regardless of the caller-supplied optlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length reported back to userspace; it does not constrain the store. A call with optlen < 4 therefore writes past the user buffer, violating the getsockopt(2) contract for all five supported optnames.

Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a plain size comparison would promote a negative optlen to size_t and slip past the check; an explicit 'len < 0' test is added first to catch negative values before the size compare.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 42859562b7cc4313a84a584f338118edb7087066affected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 598dcd53c52f8eeb9dd5382198c03960d5d40fcdaffected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 7e40f2f5e7bc06c3ddef781180ce4f7994176547affected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 35573c6cb081af2f4a7caeea291302aca5484526affected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < b4c5abaea06292e1dddb70eac1b51589b32c77a3affected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67affected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < bd6f1277b62bc1df348ca21739df2bc546fcd493affected
LinuxLinux26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 < 99985bfa8336fadcc69190ba2dcbd5386af3d661affected
LinuxLinux3.10affected
LinuxLinux0 < 3.10unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References