Medium severity6.1NVD Advisory· Published Sep 5, 2022· Updated Jun 17, 2026
CVE-2022-39842
CVE-2022-39842
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 5 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: <5.19
- cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*
- (no CPE)
- (no CPE)range: <5.19
Patches
Vulnerability mechanics
References
6- github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7nvdPatchThird Party Advisory
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19nvdRelease NotesVendor Advisory
- lists.debian.org/debian-lts-announce/2022/10/msg00000.htmlnvdMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/11/msg00001.htmlnvdMailing ListThird Party Advisory
- www.debian.org/security/2022/dsa-5257nvdThird Party Advisory
- lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/nvd
News mentions
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