Out-of-bounds Read in Google Android
CVE-2021-0942
The path in this case is a little bit convoluted. The end result is that via an ioctl an untrusted app can control the ui32PageIndex offset in the expression:sPA.uiAddr = page_to_phys(psOSPageArrayData->pagearray[ui32PageIndex]);With the current PoC this crashes as an OOB read. However, given that the OOB read value is ending up as the address field of a struct I think i seems plausible that this could lead to an OOB write if the attacker is able to cause the OOB read to pull an interesting kernel address. Regardless if this is a read or write, it is a High severity issue in the kernel.Product: AndroidVersions: Android SoCAndroid ID: A-238904312
Vulnerability class: Buffer Overflow
EPSS: 0.003 (25.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Google Android
- N/a Android — versions Android SoC
Weakness classification (CWE)
References
- security@android.com (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-0942?
- CVE-2021-0942 is a critical-severity vulnerability in Google Android, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2022-09-13.
- How severe is CVE-2021-0942?
- Critical severity. CVSS v3 base score is 9.8 out of 10.