Integer Overflow or Wraparound Affecting kernel package, versions <0:4.14.296-222.539.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNEL-3110283
- published 9 Nov 2022
- disclosed 5 Sep 2022
Introduced: 5 Sep 2022
CVE-2022-39842 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.296-222.539.amzn2 or higher.
This issue was patched in ALAS2-2022-1876.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-39842
- 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://lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/