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Vulnerability record · CVE-2026-43341 · published 8 May 2026

CVE-2026-43341: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.77% · top 46.0%
9.8CVSS 3.1 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
19 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-43341), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.