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CVE-2026-90392

HIGHCVSS 7.8/10

Last modified

CVE-2026-90392 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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..

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < a5c936ac904767fc1d943d40b0308bcb2ae2509b; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < d7d7208e2603b45724b684f4df73904fb347741e; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 85cf991c881e7198be32be05a9daa2625390c8b3; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 79347e42cfbc9e78872922e8f08a70609c9af82f; >= 0c991ebc8c69d29b7fc44db17075c5aa5253e2ab, < 863f3ddd0b8ac65abfb50d3be0869268ac0e277b
LinuxLinux5.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90392?
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.
How severe is CVE-2026-90392?
CVE-2026-90392 has a CVSS score of 7.8/10 (HIGH severity).
How do I fix CVE-2026-90392?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST