Vulnerability Details : 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.
Vulnerability category: Overflow
Products affected by CVE-2022-39842
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- 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:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2022-39842
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 16 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2022-39842
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.1
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |
1.8
|
4.2
|
NIST |
CWE ids for CVE-2022-39842
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by: nvd@nist.gov (Primary)
References for CVE-2022-39842
-
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
Release Notes;Vendor Advisory
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https://lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/
Re: [PATCH] pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write
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https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
[SECURITY] [DLA 3131-1] linux security updateMailing List;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
[SECURITY] [DLA 3173-1] linux-5.10 security updateMailing List;Third Party Advisory
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https://lore.kernel.org/all/YylaC1wHHyLw22D3@kadam/T/
Re: [PATCH] pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_writeMailing List;Patch;Vendor Advisory
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https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write · torvalds/linux@a09d2d0 · GitHubPatch;Third Party Advisory
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https://www.debian.org/security/2022/dsa-5257
Debian -- Security Information -- DSA-5257-1 linuxThird Party Advisory
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