Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
19cfe5843e86cc95542d9d875c9386e197956d75 to < 88b36d36e12c9ba76decdb580d9c1907c084e587affected19cfe5843e86cc95542d9d875c9386e197956d75 to < 587fc2a5a35b41883b22b8f808fe5d345208914baffected19cfe5843e86cc95542d9d875c9386e197956d75 to < f04ac9bf2379f3e2470c400c235eb12f74891befaffected19cfe5843e86cc95542d9d875c9386e197956d75 to < 02030f95820c42431280f4f945ff34247fb840ffaffected19cfe5843e86cc95542d9d875c9386e197956d75 to < 99fdb5c2522f365efa199d0117b641e35097041eaffected19cfe5843e86cc95542d9d875c9386e197956d75 to < 749a9048bf51a668ec3ab6c0392ba32325607281affected19cfe5843e86cc95542d9d875c9386e197956d75 to < eeb16fb24cfe67947b832fd9ada5f488afc72579affected19cfe5843e86cc95542d9d875c9386e197956d75 to < f4c7f37f0ab990952539dc68d931d65c3657600aaffected
Linux Linux
Default version status: affected
3.8affected0 to < 3.8unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587 ↗
- https://git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b ↗
- https://git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef ↗
- https://git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff ↗
- https://git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e ↗
- https://git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281 ↗
- https://git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579 ↗
- https://git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a ↗