CVE-2026-90393
UnknownSummary
In the Linux kernel, bpf_netns_link_update_prog performs checks for old_prog and prog type locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a use-after-free (UAF) when two threads concurrently execute BPF_LINK_UPDATE on the same netns link. The fix moves the checks inside the netns_bpf_mutex critical section.
Risk Assessment
A use-after-free in the BPF subsystem may cause kernel crashes or potential privilege escalation. Systems using BPF and network namespaces are at risk.
Recommendation
Update the Linux kernel to a version with the fix that moves the checks into the netns_bpf_mutex critical section. Restrict BPF_LINK_UPDATE operations to trusted users.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS