CVE-2026-90392

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux0c991ebc8c69d29b7fc44db17075c5aa5253e2ab < a5c936ac904767fc1d943d40b0308bcb2ae2509baffected
LinuxLinux0c991ebc8c69d29b7fc44db17075c5aa5253e2ab < d7d7208e2603b45724b684f4df73904fb347741eaffected
LinuxLinux0c991ebc8c69d29b7fc44db17075c5aa5253e2ab < 85cf991c881e7198be32be05a9daa2625390c8b3affected
LinuxLinux0c991ebc8c69d29b7fc44db17075c5aa5253e2ab < 79347e42cfbc9e78872922e8f08a70609c9af82faffected
LinuxLinux0c991ebc8c69d29b7fc44db17075c5aa5253e2ab < 863f3ddd0b8ac65abfb50d3be0869268ac0e277baffected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References