PatchTheCVECVE-2026-10773: The DHCPv4 client helper net_dhcpv4_msg_type_name() in subsys/net/lib/dhcpv4/dhcpv4.c indexes a static 8-eleme
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Routine
MEDIUM 5.4UPGRADE
CVE-2026-10773 is a medium-severity flaw (CVSS 5.4) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The DHCPv4 client helper net_dhcpv4_msg_type_name() in subsys/net/lib/dhcpv4/dhcpv4.c indexes a static 8-element const char * name table after a faulty bounds check. The guard used msg_type <= sizeof(name) instead of msg_type <= ARRAY_SIZE(name); sizeof returns the byte size of the pointer array (32 on 32-bit, 64 on 64-bit targets) rather than the element count of 8, so message-type values from 9 up to that byte size pass the check and cause name
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Publisher (CNA): Zephyr Project · Vendor: zephyrproject
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
zephyrproject zephyr UPGRADE
Affected: >= 3.6.0 and < 4.5.0
Fixed in: 4.5.0
Safe to downgrade to: a release before 3.6.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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