CVE-2026-43042
- Source
- https://cve.org/CVERecord?id=CVE-2026-43042
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43042.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-43042
- Downstream
- Related
- Published
- 2026-05-01T14:15:38Z
- Modified
- 2026-08-12T03:51:23Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
- Summary
- mpls: add seqcount to protect the platform_label{,s} pair
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mpls: add seqcount to protect the platform_label{,s} pair
The RCU-protected codepaths (mpls_forward, mpls_dump_routes) can have an inconsistent view of platform_labels vs platform_label in case of a concurrent resize (resize_platform_label_table, under platform_mutex). This can lead to OOB accesses.
This patch adds a seqcount, so that we get a consistent snapshot.
Note that mpls_label_ok is also susceptible to this, so the check against RTA_DST in rtm_to_route_config, done outside platform_mutex, is not sufficient. This value gets passed to mpls_label_ok once more in both mpls_route_add and mpls_route_del, so there is no issue, but that additional check must not be removed.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43042.json" }- References
-
- https://git.kernel.org/stable/c/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9ef
- https://git.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43042.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-43042
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git