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PatchSiren cyber security CVE debrief

CVE-2026-10637 zephyrproject CVE debrief

CVE-2026-10637 is a remotely triggerable denial of service vulnerability in the Zephyr networking stack. The vulnerability exists in the `mld_send()` function, which reads the packet interface after `net_send_data(pkt)` has returned successfully. This is problematic because `net_send_data(pkt)` transfers ownership of the `net_pkt` to the L2 driver, which frees it upon success. As a result, the subsequent `net_pkt_iface(pkt)` call reads a freed object, leading to a potential NULL-pointer dereference or memory corruption when `CONFIG_NET_STATISTICS_PER_INTERFACE` is enabled. The vulnerability can be triggered by sending a valid MLDv2 General Query to the local link without authentication.

Vendor
zephyrproject
Product
zephyr
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-07-14
Advisory published
2026-06-16
Advisory updated
2026-07-14

Who should care

Users of Zephyr's IPv6 MLD functionality, especially those who enable `CONFIG_NET_STATISTICS_PER_INTERFACE`, should be aware of this vulnerability. It could lead to a denial of service or, in some cases, memory corruption.

Technical summary

The vulnerability is caused by a misuse of the `net_pkt` object after it has been freed. The fix involves caching the interface in a local variable before sending the packet and not touching the packet after `net_send_data()`.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply the fix from Zephyr's commit [ref-4](https://github.com/zephyrproject-rtos/zephyr/commit/3159c53e8e7d233c2a85a0798cf25ac441db6dae).
  • Review and apply advisory [ref-5](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-m23w-34pp-4h92) for additional guidance.

Evidence notes

The CVE record [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-10637) and NVD detail [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-10637) provide additional context and information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-10637 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-10637

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-10637 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-10637

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.