Bug 2516995 (CVE-2026-74548)

Summary: CVE-2026-74548 kernel: forcedeth: fix UAF of txrx_stats in nv_remove
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
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Hardware: All   
OS: Linux   
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A flaw was found in the `forcedeth` component of the Linux kernel. The `nv_remove()` function frees the `per-CPU txrx_stats` before `unregister_netdev()` completes. This timing issue allows other functions, such as `ndo_get_stats64`, the NAPI/xmit data path, and `nv_close()/drain`, to access the freed memory, leading to a use-after-free vulnerability. This could potentially lead to system instability or denial of service.
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Description OSIDB Bzimport 2026-08-15 12:43:25 UTC 
In the Linux kernel, the following vulnerability has been resolved:

forcedeth: fix UAF of txrx_stats in nv_remove

nv_remove() frees the per-CPU txrx_stats before unregister_netdev().
Until unregister completes, ndo_get_stats64, the NAPI/xmit data path,
and nv_close()/drain may still access txrx_stats, leading to a
use-after-free.

Free the stats only after unregister_netdev().
Comment 1 gkamathe 2026-08-21 10:17:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081550-CVE-2026-74548-2ddc@gregkh/T