CVE-2025-38686

EUVD-2025-26783
In the Linux kernel, the following vulnerability has been resolved:

userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry

When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with
obtaining a folio and accessing it even though the entry is swp_entry_t. 
Add the missing check and let split_huge_pmd() handle migration entries. 
While at it also remove unnecessary folio check.

[surenb@google.com: remove extra folio check, per David]
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.5 MEDIUM
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 4%
Affected Products (NVD)
VendorProductVersion
linuxlinux_kernel
6.8 ≤
𝑥
< 6.12.43
linuxlinux_kernel
6.13 ≤
𝑥
< 6.15.11
linuxlinux_kernel
6.16 ≤
𝑥
< 6.16.2
linuxlinux_kernel
6.17:rc1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bookworm
6.1.176-1
fixed
bookworm (security)
6.1.176-1
fixed
bullseye
5.10.223-1
fixed
bullseye (security)
5.10.259-1
fixed
forky
7.1.3-1
fixed
sid
7.1.3-1
fixed
trixie
6.12.94-1
fixed
trixie (security)
6.12.95-1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
bpftool6.12
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
bpftool6.12-debuginfo
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel-livepatch-6.12.46-66.121
Amazon Linux 2023
1:1.0-0.amzn2023
fixed
kernel6.12
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-debuginfo
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-debuginfo-common-aarch64
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-debuginfo-common-x86_64
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-devel
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-headers
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-libbpf
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-libbpf-debuginfo
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-libbpf-devel
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-libbpf-static
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-modules-extra
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-modules-extra-common
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-tools
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-tools-debuginfo
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
kernel6.12-tools-devel
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
perf6.12
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
perf6.12-debuginfo
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
python3-perf6.12
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
python3-perf6.12-debuginfo
Amazon Linux 2023
1:6.12.46-66.121.amzn2023
fixed
References
https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4
https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f
https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446
https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a