CVE-2026-90223
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
In the Linux kernel NFC LLCP subsystem, nfc_llcp_recv_snl() walks the SNL TLV list without bounding reads to the actual skb data, causing length underflow, out-of-bounds reads, and a bug in strncmp()/nfc_llcp_sock_from_sn(). A nearby NFC device can reach this without authentication since LLCP link activation happens automatically after NFC-DEP. The fix walks the TLV list by pointer bounded by skb_tail_pointer() and validates lengths.
Risk Assessment
An attacker within NFC range could trigger an out-of-bounds read in the kernel without authentication, potentially leading to a system crash or data disclosure. The risk affects devices with NFC and LLCP enabled.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-90223. If NFC is not used, consider disabling NFC interfaces on devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: bound SNL TLV parsing to the skb and add length checks nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length pair derived from skb->len, without bounding reads to the actual skb data. Three problems followed: - For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed. - The per-TLV header (type, length) was read without checking that two bytes remained. - A declared TLV length could run past the end of the buffer, and an SDREQ with length == 0 made "service_name_len = length - 1" underflow (size_t), driving an out-of-bounds read in the following strncmp() / nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3] without a length check. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Walk the TLV list by pointer, bounded by skb_tail_pointer() over the linear skb data, and validate each TLV declared length before use. Add explicit length checks for SDREQ (>= 1) and SDRES (exactly 2). Found by 0sec automated security-research tooling (https://0sec.ai).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS