UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
8 explicit affected versions
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50 explicit affected versions
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16 explicit affected versions
13 explicit affected versions
5 explicit affected versions
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38 explicit affected versions
9 explicit affected versions
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49 explicit affected versions
4 explicit affected versions
38 explicit affected versions
1 explicit affected versions
26 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
- https://git.kernel.org/linus/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
- https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
- https://ubuntu.com/security/CVE-2022-39842
- https://ubuntu.com/security/notices/USN-5791-1
- https://ubuntu.com/security/notices/USN-5791-2
- https://ubuntu.com/security/notices/USN-5791-3
- https://ubuntu.com/security/notices/USN-5792-1
- https://ubuntu.com/security/notices/USN-5792-2
- https://ubuntu.com/security/notices/USN-5815-1
- https://ubuntu.com/security/notices/USN-5854-1
- https://ubuntu.com/security/notices/USN-5861-1
- https://ubuntu.com/security/notices/USN-5862-1
- https://ubuntu.com/security/notices/USN-5865-1
- https://ubuntu.com/security/notices/USN-5877-1
- https://ubuntu.com/security/notices/USN-5883-1
- https://ubuntu.com/security/notices/USN-5924-1
- https://ubuntu.com/security/notices/USN-5975-1
- https://ubuntu.com/security/notices/USN-6007-1
- https://www.cve.org/CVERecord?id=CVE-2022-39842