net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak When processing Router Advertisements with user options the kernel builds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct has three padding fields that are never zeroed and can leak kernel data The fix is simple, just zeroes the padding fields.
CVE-2026-43040
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-2026-43040
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": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "11d7fe97421cfc81549940c20ed5ac9472d6db05",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "7f56d87e527bb5a13c3e8b0d5840cb6332822f6d",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "4f810c686fde509d1cdaa706322d9d2531f8f1a4",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "b485eef3d97b7aae55ce669b6de555ec81f3d21c",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "ef3645606e4a635d5062a492f22b7f490852ee67",
"versionType": "git"
},
{
"status": "affected",
"version": "31910575a9de61e78065e93846e8e7a4894a18bf",
"lessThan": "ae05340ccaa9d347fe85415609e075545bec589f",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ndisc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.24",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"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/ndisc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43040
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28341 · Revision 1
- Added to Heist Feed
- Publisher date