Bug 2541185 (CVE-2026-98046)

Summary: CVE-2026-98046 kernel: bpf: Mark bpf_btf_find_by_name_kind() as sleepable
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
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
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. The bpf_btf_find_by_name_kind() helper function was not properly marked as sleepable (capable of pausing execution while waiting for resources), allowing it to be executed in non-sleepable contexts such as timer callbacks. A local user with permissions to load BPF programs can exploit this issue to trigger a sleep operation during an atomic context. This can lead to kernel instability or a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-25 10:55:55 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Mark bpf_btf_find_by_name_kind() as sleepable

When bpf_btf_find_by_name_kind() finds a type in module BTF, it
returns a new BTF object fd through __btf_new_fd(). This reaches
anon_inode_getfd(), which can sleep while allocating or expanding the
current task fd table.

The helper prototype does not set might_sleep, so the verifier allows
the helper in non-sleepable contexts such as BPF timer callbacks. The
fd allocation can then sleep in softirq context and install the fd into
the interrupted task.

Mark the helper as sleepable. This preserves calls from the main body
of a sleepable syscall program while rejecting calls from its
non-sleepable regions.
Comment 1 Keith Grant 2026-09-28 23:16:22 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98046.mbox