Bug 2454825 (CVE-2026-23453)

Summary: CVE-2026-23453 kernel: net: ti: icssg-prueth: Fix memory leak in XDP_DROP for non-zero-copy mode
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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A flaw was found in the Linux kernel's net: ti: icssg-prueth network driver. When XDP (eXpress Data Path) programs drop packets in non-zero-copy mode, memory pages are not properly returned to the system's page pool. This memory leak can lead to Out of Memory (OOM) conditions, causing a Denial of Service (DoS) on the affected system.
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Description OSIDB Bzimport 2026-04-03 16:02:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: ti: icssg-prueth: Fix memory leak in XDP_DROP for non-zero-copy mode

Page recycling was removed from the XDP_DROP path in emac_run_xdp() to
avoid conflicts with AF_XDP zero-copy mode, which uses xsk_buff_free()
instead.

However, this causes a memory leak when running XDP programs that drop
packets in non-zero-copy mode (standard page pool mode). The pages are
never returned to the page pool, leading to OOM conditions.

Fix this by handling cleanup in the caller, emac_rx_packet().
When emac_run_xdp() returns ICSSG_XDP_CONSUMED for XDP_DROP, the
caller now recycles the page back to the page pool. The zero-copy
path, emac_rx_packet_zc() already handles cleanup correctly with
xsk_buff_free().
Comment 1 Jon Moroney 2026-04-03 18:47:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040317-CVE-2026-23453-c4f8@gregkh/T