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the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: cavium/cpt - fix DMA cleanup using wrong loop index\n\nThe sg_cleanup error path used list[i] instead of list[j] when unmapping\nDMA buffers, leaking successfully mapped entries and repeatedly unmapping\nthe failed one."}],"metrics":[{"cvssV3_1":{"baseScore":10,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - On Cavium Thunder appliances the CPT VF skcipher driver is selected for in-kernel crypto on network-facing workloads (IPsec/xfrm ESP decrypt, NFS/RPC GSS-Kerberos), so remote peers can drive setup_sgio_components() by sending traffic that triggers hardware-accelerated AES/DES operations.\nAC:L - An attacker can reliably force the error path by fragmenting crypto buffers to raise incnt/outcnt and flooding concurrent encrypt/decrypt requests to exhaust IOMMU IOVAs, causing dma_map_single() to fail mid-loop; no uncontrollable victim state or race is required.\nPR:N - Exploitation requires no root or capabilities on the victim host; remote network peers sending IPsec or authenticated RPC traffic, or any local process using the kernel crypto API via AF_ALG sockets, can trigger the faulty DMA cleanup without admin privileges.\nUI:N - Exploitation is fully attacker-driven through automated network traffic or programmatic crypto requests and does not require any victim user action such as opening files or mounting filesystems.\nS:C - Leaked DMA mappings let the CPT PCI function continue bus-mastering kernel pages after software teardown, bypassing intended kernel DMA lifecycle and IOMMU-enforced device isolation boundaries when stale mappings target freed or repurposed memory.\nC:H - Unmapping failures leave active DMA translations while dma_addr metadata is cleared, allowing the CPT hardware to read kernel memory from freed or reallocated pages, providing a memory-corruption primitive that can disclose sensitive data.\nI:H - Stale bidirectional DMA mappings combined with bogus unmaps on DMA_MAPPING_ERROR can corrupt IOMMU state and let the accelerator write into kernel pages no longer owned by the request, enabling control of kernel memory contents.\nA:H - Repeated dma_unmap_single() on DMA_MAPPING_ERROR triggers WARN_ON in iommu_dma_unmap_phys, and accumulating leaked IOMMU mappings can exhaust DMA resources or panic the kernel during subsequent crypto operations."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:45:20.085Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/23c6174e48f66fc10b998b0acdb406cb0caf5c80"},{"url":"https://git.kernel.org/stable/c/23d3a7e896a1fe2d7a6bcb42f093948b79f8a198"},{"url":"https://git.kernel.org/stable/c/28141f95ae93b18f9bfde953cb787fcb151fb9da"},{"url":"https://git.kernel.org/stable/c/8afd1007ef79898a6e010eaade97097e49405fce"},{"url":"https://git.kernel.org/stable/c/3b8a1e1f4e4071a62b20374028744e8cc8310d48"},{"url":"https://git.kernel.org/stable/c/fb4d57b83356d4bd411b45ede3024e0ff42c9b5e"},{"url":"https://git.kernel.org/stable/c/d319b83b97b3585550d9ae592dfa78c755b6129e"},{"url":"https://git.kernel.org/stable/c/9dbf173bd32d5f81b005008b682bfb50aa093455"}],"title":"crypto: cavium/cpt - fix DMA cleanup using wrong loop 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leaking successfully mapped entries and repeatedly unmapping\nthe failed one.","Type":"Description","Title":"crypto: cavium/cpt - fix DMA cleanup using wrong loop index"}]}}}