What’s Vulnerable › Vulnerabilities

CVE-2026-90392: bpf: Fix potential UAF when reading bpf link info

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF when reading bpf link info In bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is accessed without holding any locks. If the prog is concurrently replaced via bpf_link_update, the old prog can be freed, leading to a potential UAF issue. Fix this by accessing link->prog under RCU protection to safely fetch the pointer and guarantee its lifetime while reading its fields.

Affected products

• Linux: 5.7 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4c8432a332d4a24dc2742f56062a53d8fad36f53
• https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f
• https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3
• https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b
• https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b
• https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e

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