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A use-after-free vulnerability in the Linux kernel macvlan subsystem arises from incomplete error recovery in macvlan_common_newlink(). When source-mode macvlan creation adds source-MAC entries to an existing lower device's macvlan port, then device registration fails, the failed device is freed while its private macvlan data remains referenced by the port's source-vlan hash. Subsequent packet processing in macvlan_forward_source() can dereference the stale reference when traffic matches the configured source MAC address. The upstream fix flushes source entries on the relevant macvlan-port destruction error path regardless of the creation-state value.
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Referenced as one of many CVEs addressed by SUSE kernel security updates; no vulnerability details are provided in the content.
A Linux kernel macvlan use-after-free vulnerability caused by improper error recovery in macvlan_common_newlink() when register_netdevice() fails during creation of a macvlan link in source mode.
Listed as one of 206 vulnerabilities addressed by a SUSE kernel security update; no per-CVE technical detail is provided in the content.
A specific vulnerability identified as CVE-2026-23209 is referenced in a kernelCTF-related conversation, with mentions of an exploit.md file being added. The content does not provide technical details about the flaw itself.
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Cross-references every affected SKU, including bundled OEM variants.
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