جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer. Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.

• https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2
• https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596
• https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09
• https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f
• https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280
• https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d
• https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50