CVE-2026-90223

Summary

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).

Affected Software

VendorProductVersion RangeStatus
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < 88b36d36e12c9ba76decdb580d9c1907c084e587affected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < 587fc2a5a35b41883b22b8f808fe5d345208914baffected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < f04ac9bf2379f3e2470c400c235eb12f74891befaffected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < 02030f95820c42431280f4f945ff34247fb840ffaffected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < 99fdb5c2522f365efa199d0117b641e35097041eaffected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < 749a9048bf51a668ec3ab6c0392ba32325607281affected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < eeb16fb24cfe67947b832fd9ada5f488afc72579affected
LinuxLinux19cfe5843e86cc95542d9d875c9386e197956d75 < f4c7f37f0ab990952539dc68d931d65c3657600aaffected
LinuxLinux3.8affected
LinuxLinux0 < 3.8unaffected
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