Ubuntu: (Multiple Advisories) (CVE-2024-38605): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: core: Fix NULL module pointer assignment at card init The commit 81033c6b584b ("ALSA: core: Warn on empty module") introduced a WARN_ON() for a NULL module pointer passed at snd_card object creation, and it also wraps the code around it with '#ifdef MODULE'. This works in most cases, but the devils are always in details. "MODULE" is defined when the target code (i.e. the sound core) is built as a module; but this doesn't mean that the caller is also built-in or not. Namely, when only the sound core is built-in (CONFIG_SND=y) while the driver is a module (CONFIG_SND_USB_AUDIO=m), the passed module pointer is ignored even if it's non-NULL, and card->module remains as NULL. This would result in the missing module reference up/down at the device open/close, leading to a race with the code execution after the module removal. For addressing the bug, move the assignment of card->module again out of ifdef. The WARN_ON() is still wrapped with ifdef because the module can be really NULL when all sound drivers are built-in. Note that we keep 'ifdef MODULE' for WARN_ON(), otherwise it would lead to a false-positive NULL module check. Admittedly it won't catch perfectly, i.e. no check is performed when CONFIG_SND=y. But, it's no real problem as it's only for debugging, and the condition is pretty rare.
Solution(s)
- ubuntu-upgrade-linux-image-6-8-0-1008-gke
- ubuntu-upgrade-linux-image-6-8-0-1009-raspi
- ubuntu-upgrade-linux-image-6-8-0-1010-ibm
- ubuntu-upgrade-linux-image-6-8-0-1010-oem
- ubuntu-upgrade-linux-image-6-8-0-1010-oracle
- ubuntu-upgrade-linux-image-6-8-0-1010-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1012-gcp
- ubuntu-upgrade-linux-image-6-8-0-1013-aws
- ubuntu-upgrade-linux-image-6-8-0-40-generic
- ubuntu-upgrade-linux-image-6-8-0-40-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-40-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-40-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-6-8
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-nvidia-64k-6-8
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-oem-24-04
- ubuntu-upgrade-linux-image-oem-24-04a
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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