UBUNTU-CVE-2025-38040: Medium severity ubuntu/linux-aws vulnerability
In the Linux kernel, the following vulnerability has been resolved: serial: mctrlgpio: split disablems into sync and nosync APIs The following splat has been observed on a SAMA5D27 platform using atmelserial: BUG: sleeping function called from invalid context at kernel/irq/manage.c:738 inatomic(): 1, irqsdisabled(): 128, nonblock: 0, pid: 27, name: kworker/u5:0 preemptcount: 1, expected: 0 INFO: lockdep is turned off. irq event stamp: 0 hardirqs last enabled at (0): [<00000000>] 0x0 hardirqs last disabled at (0): [<c01588f0>] copyprocess+0x1c4c/0x7bec softirqs last enabled at (0): [<c0158944>] copyprocess+0x1ca0/0x7bec softirqs last disabled at (0): [<00000000>] 0x0 CPU: 0 UID: 0 PID: 27 Comm: kworker/u5:0 Not tainted 6.13.0-rc7+ #74 Hardware name: Atmel SAMA5 Workqueue: hci0 hcipoweron [bluetooth] Call trace: unwindbacktrace from showstack+0x18/0x1c showstack from dumpstacklvl+0x44/0x70 dumpstacklvl from mightresched+0x38c/0x598 mightresched from disableirq+0x1c/0x48 disableirq from mctrlgpiodisablems+0x74/0xc0 mctrlgpiodisablems from atmeldisablems.part.0+0x80/0x1f4 atmeldisablems.part.0 from atmelsettermios+0x764/0x11e8 atmelsettermios from uartchangelinesettings+0x15c/0x994 uartchangelinesettings from uartsettermios+0x2b0/0x668 uartsettermios from ttysettermios+0x600/0x8ec ttysettermios from ttyportsetflowcontrol+0x188/0x1e0 ttyportsetflowcontrol from wilcsetup+0xd0/0x524 [hciwilc] wilcsetup [hciwilc] from hcidevopensync+0x330/0x203c [bluetooth] hcidevopensync [bluetooth] from hcidevdoopen+0x40/0xb0 [bluetooth] hcidevdoopen [bluetooth] from hcipoweron+0x12c/0x664 [bluetooth] hcipoweron [bluetooth] from processonework+0x998/0x1a38 processonework from workerthread+0x6e0/0xfb4 workerthread from kthread+0x3d4/0x484 kthread from retfromfork+0x14/0x28 This warning is emitted when trying to toggle, at the highest level, some flow control (with serdevdevicesetflowcontrol) in a device driver. At the lowest level, the atmelserial driver is using serialmctrlgpio lib to enable/disable the corresponding IRQs accordingly. The warning emitted by CONFIGDEBUGATOMICSLEEP is due to disableirq (called in mctrlgpiodisablems) being possibly called in some atomic context (some tty drivers perform modem lines configuration in regions protected by port lock). Split mctrlgpiodisablems into two differents APIs, a non-blocking one and a blocking one. Replace mctrlgpiodisablems calls with the relevant version depending on whether the call is protected by some port lock.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1046.49~22.04.1 - Upgrade
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ubuntu/linux-azure-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1051.57~22.04.1 - Upgrade
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ubuntu/linux-azure-fde-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1046.53~22.04.1 - Upgrade
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ubuntu/linux-gcp-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1047.50~22.04.2 - Upgrade
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ubuntu/linux-hwe-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-100.100~22.04.1 - Upgrade
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ubuntu/linux-ibm-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1044.44~22.04.1 - Upgrade
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ubuntu/linux-lowlatency-hwe-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-100.100.1~22.04.1 - Upgrade
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ubuntu/linux-nvidia-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1046.49~22.04.1 - Upgrade
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ubuntu/linux-oracle-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1043.44~22.04.1 - Upgrade
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ubuntu/linux-riscv-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-100.100~22.04.1 - Upgrade
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ubuntu/linux-realtime-6.8to a version that resolves this vulnerability.Fixed in 6.8.1-1041.42~22.04.1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.8.0-100.100 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1046.49 - Upgrade
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ubuntu/linux-aws-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1013.13~24.04.1 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.8.0-1046.52 - Upgrade
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ubuntu/linux-azure-fdeto a version that resolves this vulnerability.Fixed in 6.8.0-1046.53 - Upgrade
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ubuntu/linux-azure-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1039.42 - Upgrade
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ubuntu/linux-azure-nvidia-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1007.7 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.8.0-1047.50 - Upgrade
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ubuntu/linux-gcp-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1016.17~24.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1043.48 - Upgrade
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ubuntu/linux-gkeopto a version that resolves this vulnerability.Fixed in 6.8.0-1030.33 - Upgrade
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ubuntu/linux-ibmto a version that resolves this vulnerability.Fixed in 6.8.0-1044.44 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-100.100.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1046.49 - Upgrade
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ubuntu/linux-nvidia-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-1046.49.1 - Upgrade
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ubuntu/linux-nvidia-tegrato a version that resolves this vulnerability.Fixed in 6.8.0-1020.20 - Upgrade
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ubuntu/linux-oem-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1012.12 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1043.44 - Upgrade
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ubuntu/linux-oracle-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1013.13~24.04.1 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.8.0-1047.51 - Upgrade
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ubuntu/linux-riscv-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-32.32.1~24.04.1 - Upgrade
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ubuntu/linux-xilinxto a version that resolves this vulnerability.Fixed in 6.8.0-1023.24 - Upgrade
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ubuntu/linux-bluefieldto a version that resolves this vulnerability.Fixed in 6.8.0-1016.20 - Upgrade
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ubuntu/linux-raspi-realtimeto a version that resolves this vulnerability.Fixed in 6.8.0-2037.38 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.8.1-1041.42 - Upgrade
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ubuntu/linux-realtime-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1012.12~24.04.1 - Upgrade
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1046.49+fips1 - Upgrade
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ubuntu/linux-azure-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1046.52+fips1 - Upgrade
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-100.100+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1047.50+fips1 - Compensating control
Replace mctrl_gpio_disable_ms calls with the appropriate new blocking or non-blocking API: use the non-blocking variant when the call is protected by a port lock or otherwise occurs in atomic context, and the blocking variant otherwise.