net/ipv6: ioam6: prevent schema length wraparound in trace fill
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.
CVE-2026-43341
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43341
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2",
"versionType": "git"
},
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "e96d48b37708d53cbdc47f6f60b0714fc4a5f596",
"versionType": "git"
},
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "d1b041080086e91d3733a5438a8c51ad5d3d8e09",
"versionType": "git"
},
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "77695a69baca9b99d95fad09fc78c2318736604f",
"versionType": "git"
},
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "184d2e9db27c0f76226b5cad16fe29510a5d2280",
"versionType": "git"
},
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d",
"versionType": "git"
},
{
"status": "affected",
"version": "8c6f6fa6772696be0c047a711858084b38763728",
"lessThan": "5e67ba9bb531e1ec6599a82a065dea9040b9ce50",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ioam6.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/ioam6.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43341
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40062 · Revision 1
- Added to Heist Feed
- Publisher date