Linux Kernel up to 5.18 pxa3xx-gcu.c pxa3xx_gcu_write count integer overflow
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
6.5 | $0-$5k | 0.00 |
A vulnerability classified as critical has been found in Linux Kernel up to 5.18 (Operating System). This affects the function pxa3xx_gcu_write
of the file drivers/video/fbdev/pxa3xx-gcu.c. The manipulation of the argument count
with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. 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 can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:
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.
The weakness was published 09/05/2022 as a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2022-39842 since 09/05/2022. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/13/2022).
Upgrading to version 5.19 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying the patch a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 6.6VulDB Meta Temp Score: 6.5
VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 7.8
NVD Vector: 🔍
CVSSv2
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Class: Integer overflowCWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Partially
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Upgrade: Kernel 5.19
Patch: a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
Timeline
09/05/2022 🔍09/05/2022 🔍
09/05/2022 🔍
10/13/2022 🔍
Sources
Vendor: kernel.orgAdvisory: a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7
Status: Confirmed
CVE: CVE-2022-39842 (🔍)
Entry
Created: 09/05/2022 12:53Updated: 10/13/2022 08:38
Changes: 09/05/2022 12:53 (47), 10/13/2022 08:38 (11)
Complete: 🔍
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