Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 19cfe5843e86cc95542d9d875c9386e197956d75 before 88b36d36e12c9ba76decdb580d9c1907c084e587; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before 587fc2a5a35b41883b22b8f808fe5d345208914b; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before f04ac9bf2379f3e2470c400c235eb12f74891bef; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before 02030f95820c42431280f4f945ff34247fb840ff; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before 99fdb5c2522f365efa199d0117b641e35097041e; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before 749a9048bf51a668ec3ab6c0392ba32325607281; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before eeb16fb24cfe67947b832fd9ada5f488afc72579; affected 19cfe5843e86cc95542d9d875c9386e197956d75 before f4c7f37f0ab990952539dc68d931d65c3657600a |
| Linux / Linux | affected 3.8; unaffected 0 before 3.8; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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