Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix TSO header length truncation stmmac_tso_xmit() stores the protocol header length returned by stmmac_tso_header_size() in a u8. stmmac_tso_valid_packet() admits headers up to 1023 bytes, so a header longer than 255 bytes wraps modulo 256 (486 becomes 230, 256 becomes 0). A TCP over IPv6 socket carrying a few hundred bytes of sticky destination/hop-by-hop options makes skb_tcp_all_headers() exceed 255 while staying below the 1023-byte limit, so such an skb reaches stmmac_tso_xmit(). Widen proto_hdr_len to unsigned int, which is sufficient since the value is bounded by the hardware limit, and adjust the debug print specifier accordingly.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9edfa7dab8112a012b349b7937f5444fdc21e8f9 before bcf6013c2b4d732c6e4bf4d0f6ae4a18d63d414b; affected 9edfa7dab8112a012b349b7937f5444fdc21e8f9 before 15989abd74f16f44bf953d056b95f1d2fda9b0cd |
| Linux / Linux | affected 4.13; unaffected 0 before 4.13; unaffected 7.2.8 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.