net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path

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Summary

CVECVE-2026-31501
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:48 UTC
Updated2026-04-22 14:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path cppi5_hdesc_get_psdata() returns a pointer into the CPPI descriptor. In both emac_rx_packet() and emac_rx_packet_zc(), the descriptor is freed via k3_cppi_desc_pool_free() before the psdata pointer is used by emac_rx_timestamp(), which dereferences psdata[0] and psdata[1]. This constitutes a use-after-free on every received packet that goes through the timestamp path. Defer the descriptor free until after all accesses through the psdata pointer are complete. For emac_rx_packet(), move the free into the requeue label so both early-exit and success paths free the descriptor after all accesses are done. For emac_rx_packet_zc(), move the free to the end of the loop body after emac_dispatch_skb_zc() (which calls emac_rx_timestamp()) has returned.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 46eeb90f03e03d5e8f7f9f1f0eb0792104fc5f86 d5827316debcb677679bb014885d7be92c410e11 git Not specified
CNA Linux Linux affected 46eeb90f03e03d5e8f7f9f1f0eb0792104fc5f86 eb8c426c9803beb171f89d15fea17505eb517714 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d5827316debcb677679bb014885d7be92c410e11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb8c426c9803beb171f89d15fea17505eb517714 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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