{"id":"CVE-2025-38040","state":"PUBLISHED","title":"serial: mctrl_gpio: split disable_ms into sync and no_sync APIs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: mctrl_gpio: split disable_ms into sync and no_sync APIs\n\nThe following splat has been observed on a SAMA5D27 platform using\natmel_serial:\n\nBUG: sleeping function called from invalid context at kernel/irq/manage.c:738\nin_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 27, name: kworker/u5:0\npreempt_count: 1, expected: 0\nINFO: lockdep is turned off.\nirq event stamp: 0\nhardirqs last  enabled at (0): [<00000000>] 0x0\nhardirqs last disabled at (0): [<c01588f0>] copy_process+0x1c4c/0x7bec\nsoftirqs last  enabled at (0): [<c0158944>] copy_process+0x1ca0/0x7bec\nsoftirqs last disabled at (0): [<00000000>] 0x0\nCPU: 0 UID: 0 PID: 27 Comm: kworker/u5:0 Not tainted 6.13.0-rc7+ #74\nHardware name: Atmel SAMA5\nWorkqueue: hci0 hci_power_on [bluetooth]\nCall trace:\n  unwind_backtrace from show_stack+0x18/0x1c\n  show_stack from dump_stack_lvl+0x44/0x70\n  dump_stack_lvl from __might_resched+0x38c/0x598\n  __might_resched from disable_irq+0x1c/0x48\n  disable_irq from mctrl_gpio_disable_ms+0x74/0xc0\n  mctrl_gpio_disable_ms from atmel_disable_ms.part.0+0x80/0x1f4\n  atmel_disable_ms.part.0 from atmel_set_termios+0x764/0x11e8\n  atmel_set_termios from uart_change_line_settings+0x15c/0x994\n  uart_change_line_settings from uart_set_termios+0x2b0/0x668\n  uart_set_termios from tty_set_termios+0x600/0x8ec\n  tty_set_termios from ttyport_set_flow_control+0x188/0x1e0\n  ttyport_set_flow_control from wilc_setup+0xd0/0x524 [hci_wilc]\n  wilc_setup [hci_wilc] from hci_dev_open_sync+0x330/0x203c [bluetooth]\n  hci_dev_open_sync [bluetooth] from hci_dev_do_open+0x40/0xb0 [bluetooth]\n  hci_dev_do_open [bluetooth] from hci_power_on+0x12c/0x664 [bluetooth]\n  hci_power_on [bluetooth] from process_one_work+0x998/0x1a38\n  process_one_work from worker_thread+0x6e0/0xfb4\n  worker_thread from kthread+0x3d4/0x484\n  kthread from ret_from_fork+0x14/0x28\n\nThis warning is emitted when trying to toggle, at the highest level,\nsome flow control (with serdev_device_set_flow_control) in a device\ndriver. At the lowest level, the atmel_serial driver is using\nserial_mctrl_gpio lib to enable/disable the corresponding IRQs\naccordingly.  The warning emitted by CONFIG_DEBUG_ATOMIC_SLEEP is due to\ndisable_irq (called in mctrl_gpio_disable_ms) being possibly called in\nsome atomic context (some tty drivers perform modem lines configuration\nin regions protected by port lock).\n\nSplit mctrl_gpio_disable_ms into two differents APIs, a non-blocking one\nand a blocking one. Replace mctrl_gpio_disable_ms calls with the\nrelevant version depending on whether the call is protected by some port\nlock.","publishedAt":"2025-06-18T09:33:25.720Z","updatedAt":"2026-05-11T21:20:07.627Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"68435c1fa3db696db4f480385db9e50e26691d0d","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"c504c11b94d6e4ad818ca5578dffa8ff29ad0f20","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"e6a46719a2369eb5186d4f7e6c0478720ca1ec3d","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"7187ec6b0b9ff22ebac2c3bb4178b7dbbdc0a55a","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"1bd2aad57da95f7f2d2bb52f7ad15c0f4993a685","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/driver-api/serial/driver.rst","drivers/tty/serial/8250/8250_port.c","drivers/tty/serial/atmel_serial.c","drivers/tty/serial/imx.c","drivers/tty/serial/serial_mctrl_gpio.c","drivers/tty/serial/serial_mctrl_gpio.h","drivers/tty/serial/sh-sci.c","drivers/tty/serial/stm32-usart.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"6.1.141","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.93","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.31","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.14.9","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/driver-api/serial/driver.rst","drivers/tty/serial/8250/8250_port.c","drivers/tty/serial/atmel_serial.c","drivers/tty/serial/imx.c","drivers/tty/serial/serial_mctrl_gpio.c","drivers/tty/serial/serial_mctrl_gpio.h","drivers/tty/serial/sh-sci.c","drivers/tty/serial/stm32-usart.c"]}],"references":["https://git.kernel.org/stable/c/68435c1fa3db696db4f480385db9e50e26691d0d","https://git.kernel.org/stable/c/c504c11b94d6e4ad818ca5578dffa8ff29ad0f20","https://git.kernel.org/stable/c/e6a46719a2369eb5186d4f7e6c0478720ca1ec3d","https://git.kernel.org/stable/c/7187ec6b0b9ff22ebac2c3bb4178b7dbbdc0a55a","https://git.kernel.org/stable/c/1bd2aad57da95f7f2d2bb52f7ad15c0f4993a685","https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38040.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38040","state":"PUBLISHED","datePublished":"2025-06-18T09:33:25.720Z","dateUpdated":"2026-05-11T21:20:07.627Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:23.978Z"},"containers":{"cna":{"title":"serial: mctrl_gpio: split disable_ms into sync and no_sync APIs","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: mctrl_gpio: split disable_ms into sync and no_sync APIs\n\nThe following splat has been observed on a SAMA5D27 platform using\natmel_serial:\n\nBUG: sleeping function called from invalid context at kernel/irq/manage.c:738\nin_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 27, name: kworker/u5:0\npreempt_count: 1, expected: 0\nINFO: lockdep is turned off.\nirq event stamp: 0\nhardirqs last  enabled at (0): [<00000000>] 0x0\nhardirqs last disabled at (0): [<c01588f0>] copy_process+0x1c4c/0x7bec\nsoftirqs last  enabled at (0): [<c0158944>] copy_process+0x1ca0/0x7bec\nsoftirqs last disabled at (0): [<00000000>] 0x0\nCPU: 0 UID: 0 PID: 27 Comm: kworker/u5:0 Not tainted 6.13.0-rc7+ #74\nHardware name: Atmel SAMA5\nWorkqueue: hci0 hci_power_on [bluetooth]\nCall trace:\n  unwind_backtrace from show_stack+0x18/0x1c\n  show_stack from dump_stack_lvl+0x44/0x70\n  dump_stack_lvl from __might_resched+0x38c/0x598\n  __might_resched from disable_irq+0x1c/0x48\n  disable_irq from mctrl_gpio_disable_ms+0x74/0xc0\n  mctrl_gpio_disable_ms from atmel_disable_ms.part.0+0x80/0x1f4\n  atmel_disable_ms.part.0 from atmel_set_termios+0x764/0x11e8\n  atmel_set_termios from uart_change_line_settings+0x15c/0x994\n  uart_change_line_settings from uart_set_termios+0x2b0/0x668\n  uart_set_termios from tty_set_termios+0x600/0x8ec\n  tty_set_termios from ttyport_set_flow_control+0x188/0x1e0\n  ttyport_set_flow_control from wilc_setup+0xd0/0x524 [hci_wilc]\n  wilc_setup [hci_wilc] from hci_dev_open_sync+0x330/0x203c [bluetooth]\n  hci_dev_open_sync [bluetooth] from hci_dev_do_open+0x40/0xb0 [bluetooth]\n  hci_dev_do_open [bluetooth] from hci_power_on+0x12c/0x664 [bluetooth]\n  hci_power_on [bluetooth] from process_one_work+0x998/0x1a38\n  process_one_work from worker_thread+0x6e0/0xfb4\n  worker_thread from kthread+0x3d4/0x484\n  kthread from ret_from_fork+0x14/0x28\n\nThis warning is emitted when trying to toggle, at the highest level,\nsome flow control (with serdev_device_set_flow_control) in a device\ndriver. At the lowest level, the atmel_serial driver is using\nserial_mctrl_gpio lib to enable/disable the corresponding IRQs\naccordingly.  The warning emitted by CONFIG_DEBUG_ATOMIC_SLEEP is due to\ndisable_irq (called in mctrl_gpio_disable_ms) being possibly called in\nsome atomic context (some tty drivers perform modem lines configuration\nin regions protected by port lock).\n\nSplit mctrl_gpio_disable_ms into two differents APIs, a non-blocking one\nand a blocking one. Replace mctrl_gpio_disable_ms calls with the\nrelevant version depending on whether the call is protected by some port\nlock."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"68435c1fa3db696db4f480385db9e50e26691d0d","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"c504c11b94d6e4ad818ca5578dffa8ff29ad0f20","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"e6a46719a2369eb5186d4f7e6c0478720ca1ec3d","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"7187ec6b0b9ff22ebac2c3bb4178b7dbbdc0a55a","versionType":"git"},{"version":"ce59e48fdbad2aa6609ceb87e1306ec69e577e05","status":"affected","lessThan":"1bd2aad57da95f7f2d2bb52f7ad15c0f4993a685","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/driver-api/serial/driver.rst","drivers/tty/serial/8250/8250_port.c","drivers/tty/serial/atmel_serial.c","drivers/tty/serial/imx.c","drivers/tty/serial/serial_mctrl_gpio.c","drivers/tty/serial/serial_mctrl_gpio.h","drivers/tty/serial/sh-sci.c","drivers/tty/serial/stm32-usart.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"6.1.141","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.93","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.31","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.14.9","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/driver-api/serial/driver.rst","drivers/tty/serial/8250/8250_port.c","drivers/tty/serial/atmel_serial.c","drivers/tty/serial/imx.c","drivers/tty/serial/serial_mctrl_gpio.c","drivers/tty/serial/serial_mctrl_gpio.h","drivers/tty/serial/sh-sci.c","drivers/tty/serial/stm32-usart.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/68435c1fa3db696db4f480385db9e50e26691d0d"},{"url":"https://git.kernel.org/stable/c/c504c11b94d6e4ad818ca5578dffa8ff29ad0f20"},{"url":"https://git.kernel.org/stable/c/e6a46719a2369eb5186d4f7e6c0478720ca1ec3d"},{"url":"https://git.kernel.org/stable/c/7187ec6b0b9ff22ebac2c3bb4178b7dbbdc0a55a"},{"url":"https://git.kernel.org/stable/c/1bd2aad57da95f7f2d2bb52f7ad15c0f4993a685"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:20:07.627Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.1.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.6.93"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.12.31"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.14.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T17:33:17.475Z"}}]}}}