CVE-2026-43341net/ipv6: ioam6: prevent schema length wraparound in trace fill
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8c6f6fa6772696be0c047a711858084b38763728 before d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2; from 8c6f6fa6772696be0c047a711858084b38763728 before e96d48b37708d53cbdc47f6f60b0714fc4a5f596; from 8c6f6fa6772696be0c047a711858084b38763728 before d1b041080086e91d3733a5438a8c51ad5d3d8e09; from 8c6f6fa6772696be0c047a711858084b38763728 before 77695a69baca9b99d95fad09fc78c2318736604f; from 8c6f6fa6772696be0c047a711858084b38763728 before 184d2e9db27c0f76226b5cad16fe29510a5d2280; from 8c6f6fa6772696be0c047a711858084b38763728 before d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d; 8c6f6fa6772696be0c047a711858084b38763728 builds before 5e67ba9bb531e1ec6599a82a065dea9040b9ce50 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; 7.0; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2
- https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596patch
- https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09patch
- https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604fpatch
- https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280patch
- https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7dpatch
- https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.