CVE-2024-56712: udmabuf: fix memory leak on last export_udmabuf() error path
First published: Sun Dec 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: udmabuf: fix memory leak on last export_udmabuf() error path In export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a dma_buf owning the udmabuf has already been created; but the error handling in udmabuf_create() will tear down the udmabuf without doing anything about the containing dma_buf. This leaves a dma_buf in memory that contains a dangling pointer; though that doesn't seem to lead to anything bad except a memory leak. Fix it by moving the dma_buf_fd() call out of export_udmabuf() so that we can give it different error handling. Note that the shape of this code changed a lot in commit 5e72b2b41a21 ("udmabuf: convert udmabuf driver to use folios"); but the memory leak seems to have existed since the introduction of udmabuf.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.20<6.12.7 | |
| Linux Kernel | =6.13-rc1 | |
| Linux Kernel | =6.13-rc2 | |
| Linux Kernel | =6.13-rc3 | |
| debian/linux | <=5.10.223-1<=5.10.234-1<=6.1.129-1<=6.1.128-1 | 6.12.21-1 |
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Reference Links
- https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf
- https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439e
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56712
- https://nvd.nist.gov/vuln/detail/CVE-2024-56712
- https://launchpad.net/bugs/cve/CVE-2024-56712
- https://security-tracker.debian.org/tracker/CVE-2024-56712
- https://ubuntu.com/security/CVE-2024-56712
- https://git.kernel.org/linus/f49856f525acd5bef52ae28b7da2e001bbe7439e
Frequently Asked Questions
What is the severity of CVE-2024-56712?
CVE-2024-56712 has been classified as a moderate severity vulnerability due to its potential impact on system stability.
How do I fix CVE-2024-56712?
To fix CVE-2024-56712, update your Linux kernel to version 6.12.8 or later.
Which versions of the Linux kernel are affected by CVE-2024-56712?
CVE-2024-56712 affects Linux kernel versions from 4.20 up to 6.12.7 and specific release candidates of version 6.13.
What type of issue is CVE-2024-56712?
CVE-2024-56712 is a memory leak vulnerability that occurs during error handling in the export_udmabuf() functionality.
Is CVE-2024-56712 exploitable remotely?
CVE-2024-56712 is not considered remotely exploitable as it requires local access to the affected system.
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