CVE-2026-90226nfc: llcp: avoid userspace overflow on invalid optlen
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 42859562b7cc4313a84a584f338118edb7087066; from 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 598dcd53c52f8eeb9dd5382198c03960d5d40fcd; 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 builds before 7e40f2f5e7bc06c3ddef781180ce4f7994176547; from 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 35573c6cb081af2f4a7caeea291302aca5484526; from 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before b4c5abaea06292e1dddb70eac1b51589b32c77a3; 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 builds before 8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67; from 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before bd6f1277b62bc1df348ca21739df2bc546fcd493; from 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 before 99985bfa8336fadcc69190ba2dcbd5386af3d661 | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.