Bug 2536155 (CVE-2026-90392) - CVE-2026-90392 kernel: bpf: Fix potential UAF when reading bpf link info
Summary: CVE-2026-90392 kernel: bpf: Fix potential UAF when reading bpf link info
Keywords:
Status: NEW
Alias: CVE-2026-90392
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 16:40 UTC by OSIDB Bzimport
Modified: 2026-10-20 11:01 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-17 16:40:58 UTC 
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.
Comment 1 gkamathe 2026-09-21 08:29:23 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90392.mbox
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