CVE - CVE-2024-35977

CVE-ID
CVE-2024-35977	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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: <TASK> ... ? 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().
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/5e700b384ec13f5bcac9855cb28fcc674f1d3593 URL:https://git.kernel.org/stable/c/5e700b384ec13f5bcac9855cb28fcc674f1d3593 MISC:https://git.kernel.org/stable/c/9e9bb74a93b7daa32313ccaefd0edc529d40daf8 URL:https://git.kernel.org/stable/c/9e9bb74a93b7daa32313ccaefd0edc529d40daf8 MISC:https://git.kernel.org/stable/c/cfd758041d8b79aa8c3f811b6bd6105379f2f702 URL:https://git.kernel.org/stable/c/cfd758041d8b79aa8c3f811b6bd6105379f2f702
Assigning CNA
kernel.org
Date Record Created
20240517	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240517)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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