Bug 2528742 (CVE-2026-80865)

Summary: CVE-2026-80865 kernel: bpf: Add missing access_ok call to copy_user_syms
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) tracing component. A missing access check in the `copy_user_syms` function, specifically the absence of an `access_ok` call before using `__get_user` on a user space pointer, could allow a local attacker to read sensitive kernel memory. This could lead to information disclosure or potentially cause a system crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-09-04 17:17:55 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Add missing access_ok call to copy_user_syms

As reported by sashiko we use __get_user without prior access_ok call on the
user space pointer. Adding the missing call for the whole pointer array.

Plus removing the err check in the error path, because it's not needed and
also we can return -ENOMEM directly from the first kvmalloc_array fail path.

[1] https://lore.kernel.org/bpf/20260611115503.AC16D1F00893@smtp.kernel.org/
Comment 1 Mauro Matteo Cascella 2026-09-08 10:31:38 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80865.mbox