{"cve":"CVE-2023-52516","nvd":{"published":"2024-03-02T22:15:47.870","modified":"2026-06-17T06:42:54.713","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndma-debug: don't call __dma_entry_alloc_check_leak() under free_entries_lock\n\n__dma_entry_alloc_check_leak() calls into printk -> serial console\noutput (qcom geni) and grabs port->lock under free_entries_lock\nspin lock, which is a reverse locking dependency chain as qcom_geni\nIRQ handler can call into dma-debug code and grab free_entries_lock\nunder port->lock.\n\nMove __dma_entry_alloc_check_leak() call out of free_entries_lock\nscope so that we don't acquire serial console's port->lock under it.\n\nTrimmed-down lockdep splat:\n\n The existing dependency chain (in reverse order) is:\n\n               -> #2 (free_entries_lock){-.-.}-{2:2}:\n        _raw_spin_lock_irqsave+0x60/0x80\n        dma_entry_alloc+0x38/0x110\n        debug_dma_map_page+0x60/0xf8\n        dma_map_page_attrs+0x1e0/0x230\n        dma_map_single_attrs.constprop.0+0x6c/0xc8\n        geni_se_rx_dma_prep+0x40/0xcc\n        qcom_geni_serial_isr+0x310/0x510\n        __handle_irq_event_percpu+0x110/0x244\n        handle_irq_event_percpu+0x20/0x54\n        handle_irq_event+0x50/0x88\n        handle_fasteoi_irq+0xa4/0xcc\n        handle_irq_desc+0x28/0x40\n        generic_handle_domain_irq+0x24/0x30\n        gic_handle_irq+0xc4/0x148\n        do_interrupt_handler+0xa4/0xb0\n        el1_interrupt+0x34/0x64\n        el1h_64_irq_handler+0x18/0x24\n        el1h_64_irq+0x64/0x68\n        arch_local_irq_enable+0x4/0x8\n        ____do_softirq+0x18/0x24\n        ...\n\n               -> #1 (&port_lock_key){-.-.}-{2:2}:\n        _raw_spin_lock_irqsave+0x60/0x80\n        qcom_geni_serial_console_write+0x184/0x1dc\n        console_flush_all+0x344/0x454\n        console_unlock+0x94/0xf0\n        vprintk_emit+0x238/0x24c\n        vprintk_default+0x3c/0x48\n        vprintk+0xb4/0xbc\n        _printk+0x68/0x90\n        register_console+0x230/0x38c\n        uart_add_one_port+0x338/0x494\n        qcom_geni_serial_probe+0x390/0x424\n        platform_probe+0x70/0xc0\n        really_probe+0x148/0x280\n        __driver_probe_device+0xfc/0x114\n        driver_probe_device+0x44/0x100\n        __device_attach_driver+0x64/0xdc\n        bus_for_each_drv+0xb0/0xd8\n        __device_attach+0xe4/0x140\n        device_initial_probe+0x1c/0x28\n        bus_probe_device+0x44/0xb0\n        device_add+0x538/0x668\n        of_device_add+0x44/0x50\n        of_platform_device_create_pdata+0x94/0xc8\n        of_platform_bus_create+0x270/0x304\n        of_platform_populate+0xac/0xc4\n        devm_of_platform_populate+0x60/0xac\n        geni_se_probe+0x154/0x160\n        platform_probe+0x70/0xc0\n        ...\n\n               -> #0 (console_owner){-...}-{0:0}:\n        __lock_acquire+0xdf8/0x109c\n        lock_acquire+0x234/0x284\n        console_flush_all+0x330/0x454\n        console_unlock+0x94/0xf0\n        vprintk_emit+0x238/0x24c\n        vprintk_default+0x3c/0x48\n        vprintk+0xb4/0xbc\n        _printk+0x68/0x90\n        dma_entry_alloc+0xb4/0x110\n        debug_dma_map_sg+0xdc/0x2f8\n        __dma_map_sg_attrs+0xac/0xe4\n        dma_map_sgtable+0x30/0x4c\n        get_pages+0x1d4/0x1e4 [msm]\n        msm_gem_pin_pages_locked+0x38/0xac [msm]\n        msm_gem_pin_vma_locked+0x58/0x88 [msm]\n        msm_ioctl_gem_submit+0xde4/0x13ac [msm]\n        drm_ioctl_kernel+0xe0/0x15c\n        drm_ioctl+0x2e8/0x3f4\n        vfs_ioctl+0x30/0x50\n        ...\n\n Chain exists of:\n   console_owner --> &port_lock_key --> free_entries_lock\n\n  Possible unsafe locking scenario:\n\n        CPU0                    CPU1\n        ----                    ----\n   lock(free_entries_lock);\n                                lock(&port_lock_key);\n                                lock(free_entries_lock);\n   lock(console_owner);\n\n                *** DEADLOCK ***\n\n Call trace:\n  dump_backtrace+0xb4/0xf0\n  show_stack+0x20/0x30\n  dump_stack_lvl+0x60/0x84\n  dump_stack+0x18/0x24\n  print_circular_bug+0x1cc/0x234\n  check_noncircular+0x78/0xac\n  __lock_acquire+0xdf8/0x109c\n  lock_acquire+0x234/0x284\n  console_flush_all+0x330/0x454\n  consol\n---truncated---","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/ac0d068099349cbca3d93f2e3b15bb329364b08c","https://git.kernel.org/stable/c/be8f49029eca3efbad0d74dbff3cb9129994ffab","https://git.kernel.org/stable/c/c79300599923daaa30f417c75555d5566b3d31ae","https://git.kernel.org/stable/c/fb5a4315591dae307a65fc246ca80b5159d296e1","https://git.kernel.org/stable/c/fe2b811a02c3244ebf6059039e4a9e715e26a9e3"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:46:54.846886191+00:00"},"epss":{"cve":"CVE-2023-52516","score":0.00171,"percentile":0.06482,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}