CVE-2024-46706 Affecting kernel-coco_debug-devel package, versions <6.4.0-15061.6.coco15sp6.1


Severity

Recommended
low

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-SLES156-KERNELCOCODEBUGDEVEL-8170791
  • published9 Oct 2024
  • disclosed8 Oct 2024

Introduced: 8 Oct 2024

CVE-2024-46706  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade SLES:15.6 kernel-coco_debug-devel to version 6.4.0-15061.6.coco15sp6.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-coco_debug-devel package and not the kernel-coco_debug-devel package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

tty: serial: fsl_lpuart: mark last busy before uart_add_one_port

With "earlycon initcall_debug=1 loglevel=8" in bootargs, kernel sometimes boot hang. It is because normal console still is not ready, but runtime suspend is called, so early console putchar will hang in waiting TRDE set in UARTSTAT.

The lpuart driver has auto suspend delay set to 3000ms, but during uart_add_one_port, a child device serial ctrl will added and probed with its pm runtime enabled(see serial_ctrl.c). The runtime suspend call path is: device_add |-> bus_probe_device |->device_initial_probe |->__device_attach |-> pm_runtime_get_sync(dev->parent); |-> pm_request_idle(dev); |-> pm_runtime_put(dev->parent);

So in the end, before normal console ready, the lpuart get runtime suspended. And earlycon putchar will hang.

To address the issue, mark last busy just after pm_runtime_enable, three seconds is long enough to switch from bootconsole to normal console.

CVSS Scores

version 3.1