CVE-2022-39842: Integer Overflow
First published: Mon Sep 05 2022(Updated: )
** DISPUTED ** An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Android | ||
| Linux Kernel | <5.19 | |
| Linux Kernel | =5.19-rc1 | |
| Linux Kernel | =5.19-rc2 | |
| Linux Kernel | =5.19-rc3 | |
| Debian Linux | =10.0 | |
| Debian Linux | =11.0 | |
| 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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Reference Links
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
- https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
- https://lore.kernel.org/all/YylaC1wHHyLw22D3@kadam/T/
- https://www.debian.org/security/2022/dsa-5257
- https://launchpad.net/bugs/cve/CVE-2022-39842
- https://lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/
- https://android.googlesource.com/kernel/common/+/d75ef462c3dbd5bb52313e32d545c8be7f79049d
- https://source.android.com/docs/security/bulletin/2023-02-01 (Advisory)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-39842
- https://nvd.nist.gov/vuln/detail/CVE-2022-39842
- https://security-tracker.debian.org/tracker/CVE-2022-39842
- https://ubuntu.com/security/CVE-2022-39842
- https://git.kernel.org/linus/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
Frequently Asked Questions
What is the severity of CVE-2022-39842?
CVE-2022-39842 is classified as a medium severity vulnerability due to the potential for integer overflow.
How do I fix CVE-2022-39842?
To mitigate CVE-2022-39842, upgrade to a kernel version that is 5.19 or higher, or apply the relevant patches provided by your distribution.
Which software versions are affected by CVE-2022-39842?
CVE-2022-39842 affects Linux kernel versions before 5.19, including specific release candidates and certain Debian Linux distributions.
What type of vulnerability is CVE-2022-39842?
CVE-2022-39842 is an integer overflow vulnerability in the pxa3xx_gcu_write function of the Linux kernel.
Is there a known exploit for CVE-2022-39842?
As of now, there are no publicly available exploits reported for CVE-2022-39842, but its nature could allow for potential future exploitation.
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