CVE-2026-43341

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2affected
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < e96d48b37708d53cbdc47f6f60b0714fc4a5f596affected
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < d1b041080086e91d3733a5438a8c51ad5d3d8e09affected
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < 77695a69baca9b99d95fad09fc78c2318736604faffected
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < 184d2e9db27c0f76226b5cad16fe29510a5d2280affected
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7daffected
LinuxLinux8c6f6fa6772696be0c047a711858084b38763728 < 5e67ba9bb531e1ec6599a82a065dea9040b9ce50affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References