MEDIUM 6.1 Microsoft
CVE-2022-39842
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.
Microsoft Security Update 2022-Sep: 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.
Affected Products
- cm1 kernel 5.10.145.1-1 on CBL Mariner 1.0
- cbl2 kernel 5.15.70.1-1 on CBL Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-39842
- https://nvd.nist.gov/vuln/detail/CVE-2022-39842
This medium severity vulnerability with a CVSS score of 6.1 was published on 2022-09-13 via Microsoft. Affected: cm1 kernel 5.10.145.1-1 on CBL Mariner 1.0, cbl2 kernel 5.15.70.1-1 on CBL Mariner 2.0.
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