Loading vulnerability…
CVE-2026-23209 is a use-after-free vulnerability in the Linux kernel's macvlan implementation caused by incomplete error recovery in macvlan_common_newlink(). Creating a source-mode macvlan interface with MACVLAN_MACADDR_ADD or MACVLAN_MACADDR_SET adds source-address entries referencing the new interface's private data before device registration succeeds. If the lower device already has a macvlan port and register_netdevice() fails, free_netdev() frees the network device without removing those references from vlan_source_hash. Subsequent packets with a matching source MAC address access freed memory in macvlan_forward_source(), potentially crashing the kernel.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
53 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in Linux kernel macvlan handling occurs when network-device registration fails after source-MAC entries have been added. Incomplete cleanup leaves dangling references that subsequent packets can access. The content provides a kernel-crash reproducer and assigns a CVSS v3 base score of 7.8, while explicitly reporting no known exploits.
A Linux kernel macvlan use-after-free caused by incomplete error recovery in macvlan_common_newlink(). Failed creation of a source-mode macvlan interface leaves a reference to freed memory, allowing subsequent matching packets to crash the kernel. The advisory provides a crash reproducer, rates the vulnerability CVSS v3 7.8, and explicitly reports no known exploits.
A Linux kernel macvlan use-after-free vulnerability caused by incomplete cleanup when creation of a source-mode macvlan interface fails. A source-hash entry retains a reference to freed network-device memory, and subsequent matching packets can trigger a kernel crash. The content includes a crash reproducer and reports a CVSS v3 base score of 7.8, with local access and low privileges required. The fix flushes source entries during the error-recovery path.
A use-after-free vulnerability in the Linux kernel's macvlan error-recovery path. Creating a source-mode macvlan link with source MAC entries and causing device registration to fail can leave dangling references, allowing subsequent packets to crash the kernel. The content includes a crash reproducer and rates the vulnerability High, with a CVSS v3 base score of 7.8. The fix flushes source entries on the relevant error path; the recommended package update is version 6.1.164-1 or later.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.