CVE-2025-38257
Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Prevent overflow in size calculation for memdup_user() Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow. In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later. Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations. Found by Linux Verification Center (linuxtesting.org).
How to fix
- linux linux_kernel5.15.187, 6.1.143, 6.6.96, 6.12.36, 6.15.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.4 ≤ v < 5.15.187, 5.16 ≤ v < 6.1.143, 6.2 ≤ v < 6.6.96, 6.7 ≤ v < 6.12.36, 6.13 ≤ v < 6.15.5, 6.16 | 5.15.187, 6.1.143, 6.6.96, 6.12.36, 6.15.5 |
| debian debian_linux | 11.0 | — |
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