Bug 2482557 (CVE-2026-46188)

Summary: CVE-2026-46188 kernel: octeon_ep_vf: add NULL check for napi_build_skb()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, 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. Specifically, within the `octeon_ep_vf` driver, the `__octep_vf_oq_process_rx()` function fails to check for a NULL return value from `napi_build_skb()` during memory allocation. This oversight can lead to a NULL pointer dereference, allowing a local attacker to potentially cause a denial of service by crashing the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-28 11:03:08 UTC 
In the Linux kernel, the following vulnerability has been resolved:

octeon_ep_vf: add NULL check for napi_build_skb()

napi_build_skb() can return NULL on allocation failure. In
__octep_vf_oq_process_rx(), the result is used directly without a NULL
check in both the single-buffer and multi-fragment paths, leading to a
NULL pointer dereference.

Add NULL checks after both napi_build_skb() calls, properly advancing
descriptors and consuming remaining fragments on failure.
Comment 1 Keith Grant 2026-05-28 14:16:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052831-CVE-2026-46188-7083@gregkh/T