CVE-2025-38257

Summary

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).

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < ad1bdd24a02d5a8d119af8e4cd50933780a6d29faffected
LinuxLinuxf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < faa1ab4a23c42e34dc000ef4977b751d94d5148caffected
LinuxLinuxf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < 88f3869649edbc4a13f6c2877091f81cd5a50f05affected
LinuxLinuxf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < f855b119e62b004a5044ed565f2a2b368c4d3f16affected
LinuxLinuxf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < 73483ca7e07a5e39bdf612eec9d3d293e8bef649affected
LinuxLinuxf2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < 7360ee47599af91a1d5f4e74d635d9408a54e489affected
LinuxLinux5.4affected
LinuxLinux0 < 5.4unaffected
LinuxLinux5.15.187 <= 5.15.*unaffected
LinuxLinux6.1.143 <= 6.1.*unaffected
LinuxLinux6.6.96 <= 6.6.*unaffected
LinuxLinux6.12.36 <= 6.12.*unaffected
LinuxLinux6.15.5 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References