CVE-2026-29004 (GCVE-0-2026-29004)
Vulnerability from cvelistv5 – Published: 2026-05-04 18:05 – Updated: 2026-07-15 01:10 X_Open Source
VLAI
EPSS
VEX
Title
BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS
Summary
BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-06 13:46 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-… | technical-descriptionexploit |
| https://github.com/vda-linux/busybox_mirror/commi… | patch |
| https://github.com/vda-linux/busybox_mirror/commi… | patch |
| https://busybox.net/ | product |
| https://www.vulncheck.com/advisories/busybox-dhcp… | third-party-advisory |
| https://access.redhat.com/security/cve/CVE-2026-29004 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2466526 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:30652 | vendor-advisoryx_refsource_REDHAT |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| vda-linux | busybox_mirror |
Affected:
0 , < 42202bfb1e6ac51fa995beda8be4d7b654aeee2a
(git)
|
guessed | |
| Red Hat | Red Hat Hardened Images |
Unaffected:
1.37.0-7.3.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
||
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
Date Public
2026-03-12 00:00
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],
"title": "BusyBox: BusyBox: Arbitrary Code Execution via DHCPv6 Client Heap Buffer Overflow",
"workarounds": [
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],
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"metrics": [
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"title": "BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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