net: stmmac: fix TSO header length truncation

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Summary

CVECVE-2026-98288
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:19 UTC
Updated2026-10-06 09:18:19 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001620000 probability, percentile 0.048430000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9edfa7dab8112a012b349b7937f5444fdc21e8f9 bcf6013c2b4d732c6e4bf4d0f6ae4a18d63d414b git Not specified
CNA Linux Linux affected 9edfa7dab8112a012b349b7937f5444fdc21e8f9 15989abd74f16f44bf953d056b95f1d2fda9b0cd git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bcf6013c2b4d732c6e4bf4d0f6ae4a18d63d414b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/15989abd74f16f44bf953d056b95f1d2fda9b0cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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