CVE-2024-38605: ALSA: core: Fix NULL module pointer assignment at card init
First published: Wed Jun 19 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.10.219 | 5.10.219 |
| redhat/kernel | <5.15.161 | 5.15.161 |
| redhat/kernel | <6.1.93 | 6.1.93 |
| redhat/kernel | <6.6.33 | 6.6.33 |
| redhat/kernel | <6.8.12 | 6.8.12 |
| redhat/kernel | <6.9.3 | 6.9.3 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/39381fe7394e5eafac76e7e9367e7351138a29c1
- https://git.kernel.org/stable/c/6b8374ee2cabcf034faa34e69a855dc496a9ec12
- https://git.kernel.org/stable/c/c935e72139e6d523defd60fe875c01eb1f9ea5c5
- https://git.kernel.org/stable/c/d7ff29a429b56f04783152ad7bbd7233b740e434
- https://git.kernel.org/stable/c/e007476725730c1a68387b54b7629486d8a8301e
- https://git.kernel.org/stable/c/e644036a3e2b2c9b3eee3c61b5d31c2ca8b5ba92
- https://git.kernel.org/stable/c/e7e0ca200772bdb2fdc6d43d32d341e87a36f811
- https://launchpad.net/bugs/cve/CVE-2024-38605
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38605
- https://nvd.nist.gov/vuln/detail/CVE-2024-38605
- https://security-tracker.debian.org/tracker/CVE-2024-38605
- https://ubuntu.com/security/CVE-2024-38605
- https://git.kernel.org/linus/39381fe7394e5eafac76e7e9367e7351138a29c1
- https://access.redhat.com/security/cve/CVE-2024-38605
- https://lore.kernel.org/linux-cve-announce/2024061925-CVE-2024-38605-3dc4@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2293359
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