CVE-2026-90393

CVE CVE-2026-90393EUVD EUVD-2026-82054Published 2026-09-17T16:09:26.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 5.10.270; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <79a66fd997d4eecf17302d613194879eb32e0986; patch: 0; patch: 5.15.221; 5.8; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <5c5997836381010fc5907b36bc17d3b19407e933; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <277168cb9d153ce8e9c3f9275670e32ae61b41d6; patch: 7.3-rc1; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <d462b5481d77ce7df8a5ff89a699386f00c9214d; patch: 6.6.157; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <f4ce6803df4095777191d800bebc50219b615ca0; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bda86e9f31b9a296b6e64a51c91dc776fc9f613e; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <bdddf3e1493ee973619c154a57071ce67f78598b; 7f045a49fee04b5662cbdeaf0838f9322ae8c63a <923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7; patch: 7.2.6; patch: 6.12.110; patch: 6.1.188; patch: 6.18.52

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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