High 7.3Published Jul 9, 2025

CVE-2025-38257s390/pkey: Prevent overflow in size calculation for memdup_user()

Updated under an hour ago (Oct 28, 2026, 12:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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).

CVSS: 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d before ad1bdd24a02d5a8d119af8e4cd50933780a6d29f; from f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d before faa1ab4a23c42e34dc000ef4977b751d94d5148c; from f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d before 88f3869649edbc4a13f6c2877091f81cd5a50f05; from f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d before f855b119e62b004a5044ed565f2a2b368c4d3f16; from f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d before 73483ca7e07a5e39bdf612eec9d3d293e8bef649; from f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d before 7360ee47599af91a1d5f4e74d635d9408a54e489	CNA record
linux linux_kernel linux:linux_kernel	from 5.4 before 5.15.187; from 5.16 before 6.1.143; from 6.2 before 6.6.96; from 6.7 before 6.12.36; from 6.13 before 6.15.5; 6.16; 6.16; 6.16	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f	patch
https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c	patch
https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05	patch
https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16	patch
https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649	patch
https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.