CVE-2024-35824 Affecting kernel-rt-debug-kvm package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS7-KERNELRTDEBUGKVM-6882088
- published18 May 2024
- disclosed17 May 2024
Introduced: 17 May 2024
CVE-2024-35824 (opens in a new tab)How to fix?
There is no fixed version for Centos:7 kernel-rt-debug-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
misc: lis3lv02d_i2c: Fix regulators getting en-/dis-abled twice on suspend/resume
When not configured for wakeup lis3lv02d_i2c_suspend() will call lis3lv02d_poweroff() even if the device has already been turned off by the runtime-suspend handler and if configured for wakeup and the device is runtime-suspended at this point then it is not turned back on to serve as a wakeup source.
Before commit b1b9f7a49440 ("misc: lis3lv02d_i2c: Add missing setting of the reg_ctrl callback"), lis3lv02d_poweroff() failed to disable the regulators which as a side effect made calling poweroff() twice ok.
Now that poweroff() correctly disables the regulators, doing this twice triggers a WARN() in the regulator core:
unbalanced disables for regulator-dummy WARNING: CPU: 1 PID: 92 at drivers/regulator/core.c:2999 _regulator_disable ...
Fix lis3lv02d_i2c_suspend() to not call poweroff() a second time if already runtime-suspended and add a poweron() call when necessary to make wakeup work.
lis3lv02d_i2c_resume() has similar issues, with an added weirness that it always powers on the device if it is runtime suspended, after which the first runtime-resume will call poweron() again, causing the enabled count for the regulator to increase by 1 every suspend/resume. These unbalanced regulator_enable() calls cause the regulator to never be turned off and trigger the following WARN() on driver unbind:
WARNING: CPU: 1 PID: 1724 at drivers/regulator/core.c:2396 _regulator_put
Fix this by making lis3lv02d_i2c_resume() mirror the new suspend().
References
- https://access.redhat.com/security/cve/CVE-2024-35824
- https://git.kernel.org/stable/c/4154e767354140db7804207117e7238fb337b0e7
- https://git.kernel.org/stable/c/997ca415384612c8df76d99d9a768e0b3f42b325
- https://git.kernel.org/stable/c/ac3e0384073b2408d6cb0d972fee9fcc3776053d
- https://git.kernel.org/stable/c/f6df761182fc953907b18aba5049fc2a044ecb45