Advisory Published
Updated

CVE-2024-56624: iommufd: Fix out_fput in iommufd_fault_alloc()

First published: Fri Dec 27 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix out_fput in iommufd_fault_alloc() As fput() calls the file->f_op->release op, where fault obj and ictx are getting released, there is no need to release these two after fput() one more time, which would result in imbalanced refcounts: refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 48 PID: 2369 at lib/refcount.c:31 refcount_warn_saturate+0x60/0x230 Call trace: refcount_warn_saturate+0x60/0x230 (P) refcount_warn_saturate+0x60/0x230 (L) iommufd_fault_fops_release+0x9c/0xe0 [iommufd] ... VFS: Close: file count is 0 (f_op=iommufd_fops [iommufd]) WARNING: CPU: 48 PID: 2369 at fs/open.c:1507 filp_flush+0x3c/0xf0 Call trace: filp_flush+0x3c/0xf0 (P) filp_flush+0x3c/0xf0 (L) __arm64_sys_close+0x34/0x98 ... imbalanced put on file reference count WARNING: CPU: 48 PID: 2369 at fs/file.c:74 __file_ref_put+0x100/0x138 Call trace: __file_ref_put+0x100/0x138 (P) __file_ref_put+0x100/0x138 (L) __fput_sync+0x4c/0xd0 Drop those two lines to fix the warnings above.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Kernel
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.128-1
6.12.20-1
6.12.21-1

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Frequently Asked Questions

  • What is the severity of CVE-2024-56624?

    CVE-2024-56624 is considered to have a moderate severity rating.

  • How do I fix CVE-2024-56624?

    To fix CVE-2024-56624, update to the latest version of the Linux kernel that includes the necessary patches.

  • What systems are affected by CVE-2024-56624?

    CVE-2024-56624 affects various versions of the Linux kernel, specifically those that utilize the iommufd subsystem.

  • Does CVE-2024-56624 allow for exploitation?

    CVE-2024-56624 does not directly allow for exploitation but can lead to potential instability in the affected kernel version.

  • Is there a workaround for CVE-2024-56624?

    Currently, there is no established workaround for CVE-2024-56624 other than applying the kernel patch.

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