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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 5.19-rc1 | 5.19-rc1.x |
| linux / linux_kernel | - | 5.19 |
| linux / linux_kernel | 5.19-rc2 | 5.19-rc2.x |
| linux / linux_kernel | 5.19-rc3 | 5.19-rc3.x |
| debian / debian_linux | 10.0 | 10.0.x |
| debian / debian_linux | 11.0 | 11.0.x |
- 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://lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/
- https://www.debian.org/security/2022/dsa-5257
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