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The vulnerable path is reachable through local SPI-memory reads, including read(2) on an accessible file in a TI QSPI-backed JFFS2 or UBIFS filesystem.\nAC:L - Once memory pressure causes the coherent-buffer allocation failure, ordinary flash reads deterministically reuse the released channel without requiring a race or uncontrollable heap layout.\nPR:L - An ordinary unprivileged user can trigger flash I/O by reading a permitted file on a mounted QSPI-backed filesystem, with no capability check in the read path.\nUI:N - The attacker directly initiates the read and requires no action from another user.\nS:U - The resulting kernel and DMA corruption remains within the host kernel's security authority and does not inherently cross a VM or IOMMU boundary.\nC:H - Reuse of the released DMA channel can transfer data from unintended physical addresses into kernel buffers, enabling serious kernel-memory disclosure.\nI:H - Stale DMA submissions or a second channel release can corrupt DMA state, interfere with a reassigned client, and plausibly provide memory-corruption or code-execution primitives.\nA:H - 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{"bugzilla": {"description": "kernel: spi: ti-qspi: fix use-after-free after DMA setup failure", "id": "2506812", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506812"}, "csaw": false, "cwe": "CWE-825", "details": ["No description is available for this CVE."], "name": "CVE-2026-64221", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64221\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64221\nhttps://lore.kernel.org/linux-cve-announce/2026072416-CVE-2026-64221-299d@gregkh/T"]}