CVE-2026-43040

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Source
https://cve.org/CVERecord?id=CVE-2026-43040
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43040.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-43040
Downstream
Related
Published
2026-05-01T14:15:37.364Z
Modified
2026-07-03T18:29:25.805031908Z
Summary
net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak
Details

In the Linux kernel, the following vulnerability has been resolved:

net: ipv6: ndisc: fix ndiscrauseropt 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43040.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
31910575a9de61e78065e93846e8e7a4894a18bf
Fixed
1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c
Fixed
2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648
Fixed
11d7fe97421cfc81549940c20ed5ac9472d6db05
Fixed
7f56d87e527bb5a13c3e8b0d5840cb6332822f6d
Fixed
4f810c686fde509d1cdaa706322d9d2531f8f1a4
Fixed
b485eef3d97b7aae55ce669b6de555ec81f3d21c
Fixed
ef3645606e4a635d5062a492f22b7f490852ee67
Fixed
ae05340ccaa9d347fe85415609e075545bec589f

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43040.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.24
Fixed
5.10.253
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.203
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.168
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.134
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.81
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.22
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
6.19.12

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43040.json"