ZDI-26-686: Linux Kernel nftables Race Condition Local Privilege Escalation Vulnerability
ZDI discloses CVE-2026-74565, a CVSS 7.8 nftables race condition letting local low-privileged attackers escalate privileges on Linux.
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: make nft_object rhltable per table The nft_object rhltable is global, this allows for accessing objects that are being dismangled from lookup path by other existing netns. Given the nft_obj_destroy() releases the object inmediately, this might lead to use-after-free of these objects that are being released. Make the existing rhltable per table to address this issue to deal with with the nft_rcv_nl_event() path too. Update nft_obj_lookup() to take the table as non-const, otherwise, compiler complains when passing the objname_ht to rhltable_lookup().
ZDI discloses CVE-2026-74565, a CVSS 7.8 nftables race condition letting local low-privileged attackers escalate privileges on Linux.
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