cbcvebase.
CVE-2024-35977
published 2024-05-20

CVE-2024-35977: In the Linux kernel, the following vulnerability has been resolved: platform/chrome: cros_ec_uart: properly fix race condition The cros_ec_uart_probe()…

PriorityP415medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.17%
6.9th percentile
In the Linux kernel, the following vulnerability has been resolved: platform/chrome: cros_ec_uart: properly fix race condition The cros_ec_uart_probe() function calls devm_serdev_device_open() before it calls serdev_device_set_client_ops(). This can trigger a NULL pointer dereference: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... Call Trace: ... ? ttyport_receive_buf A simplified version of crashing code is as follows: static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl, const u8 *data, size_t count) { struct serdev_device *serdev = ctrl->serdev; if (!serdev || !serdev->ops->receive_buf) // CRASH! return 0; return serdev->ops->receive_buf(serdev, data, count); } It assumes that if SERPORT_ACTIVE is set and serdev exists, serdev->ops will also exist. This conflicts with the existing cros_ec_uart_probe() logic, as it first calls devm_serdev_device_open() (which sets SERPORT_ACTIVE), and only later sets serdev->ops via serdev_device_set_client_ops(). Commit 01f95d42b8f4 ("platform/chrome: cros_ec_uart: fix race condition") attempted to fix a similar race condition, but while doing so, made the window of error for this race condition to happen much wider. Attempt to fix the race condition again, making sure we fully setup before calling devm_serdev_device_open().

Affected

11 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.8.9-1 (forky)linux 6.8.9-1 (forky)
linuxlinux
linuxlinux>= 01f95d42b8f4e88f20d68791b0a85dbb9e3d1ac9 < cfd758041d8b79aa8c3f811b6bd6105379f2f702cfd758041d8b79aa8c3f811b6bd6105379f2f702
linuxlinux>= 01f95d42b8f4e88f20d68791b0a85dbb9e3d1ac9 < 9e9bb74a93b7daa32313ccaefd0edc529d40daf89e9bb74a93b7daa32313ccaefd0edc529d40daf8
linuxlinux>= 01f95d42b8f4e88f20d68791b0a85dbb9e3d1ac9 < 5e700b384ec13f5bcac9855cb28fcc674f1d35935e700b384ec13f5bcac9855cb28fcc674f1d3593
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.8.9-16.8.9-1
linuxlinux_kernel>= 0 < 6.8.9-16.8.9-1
linuxlinux_kernel>= 0 < 6.8.0-38.386.8.0-38.38
linuxlinux_kernel>= 6.3 < 6.6.286.6.28
linuxlinux_kernel>= 6.7 < 6.8.76.8.7

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv6.8MEDIUM
vendor_debian4.7LOW
vendor_redhat4.7MEDIUM
vendor_ubuntu4.6MEDIUM
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