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Fencer Vulns
high 7.8

CVE-2025-38172 json

erofs: avoid using multiple devices with different type

published 2025-07-03 16 mo ago modified 2026-08-05 3 mo ago also EUVD-2025-19772

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

erofs: avoid using multiple devices with different type

For multiple devices, both primary and extra devices should be the same type. `erofs_init_device` has already guaranteed that if the primary is a file-backed device, extra devices should also be regular files.

However, if the primary is a block device while the extra device is a file-backed device, `erofs_init_device` will get an ENOTBLK, which is not treated as an error in `erofs_fc_get_tree`, and that leads to an UAF:

erofs_fc_get_tree get_tree_bdev_flags(erofs_fc_fill_super) erofs_read_superblock erofs_init_device // sbi->dif0 is not inited yet, // return -ENOTBLK deactivate_locked_super free(sbi) if (err is -ENOTBLK) sbi->dif0.file = filp_open() // sbi UAF

So if -ENOTBLK is hitted in `erofs_init_device`, it means the primary device must be a block device, and the extra device is not a block device. The error can be converted to -EINVAL.

Patch / fix

  • Linux Linux 6.12.34, 6.15.3, 6.16
  • linux Debian 14, Debian 13 6.12.35-1

debian advisories DEBIAN-CVE-2025-38172

  • linux-aws-6.14 Ubuntu 24.04 LTS 6.14.0-1013.13~24.04.1
  • linux-gcp-6.14 Ubuntu 24.04 LTS 6.14.0-1016.17~24.04.1
  • linux-oem-6.14 Ubuntu 24.04 LTS 6.14.0-1012.12
  • linux-riscv-6.14 Ubuntu 24.04 LTS 6.14.0-32.32.1~24.04.1
  • linux-oracle-6.14 Ubuntu 24.04 LTS 6.14.0-1013.13~24.04.1
  • linux-azure-nvidia-6.14 Ubuntu 24.04 LTS 6.14.0-1007.7
  • linux-realtime-6.14 Ubuntu Pro Realtime 24.04 LTS 6.14.0-1012.12~24.04.1

ubuntu advisories UBUNTU-CVE-2025-38172

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.1 6.12.0-124.38.1.el10_1
  • rv RHEL 10.1 6.12.0-124.38.1.el10_1
  • perf RHEL 10.1 6.12.0-124.38.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.38.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.38.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.38.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.38.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.38.1.el10_1

red hat advisories RHSA-2026:2721RHSA-2026:1727

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel-abi-stablelists AlmaLinux 10 6.12.0-124.38.1.el10_1

almalinux advisories ALSA-2026:2721

  • kernel Rocky Linux 10 6.12.0-124.38.1.el10_1

rocky linux advisories RLSA-2026:2721

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-38172 updated cvss 7.3

kernel: Linux kernel erofs: Use-After-Free due to device type mismatch

  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.38.1.el10_1, perf 6.12.0-124.38.1.el10_1, rtla 6.12.0-124.38.1.el10_1, python3-perf 6.12.0-124.38.1.el10_1, kernel-devel-matched 6.12.0-124.38.1.el10_1, kernel-64k-devel-matched 6.12.0-124.38.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.58.1.el10_0, perf 6.12.0-55.58.1.el10_0, rtla 6.12.0-55.58.1.el10_0, python3-perf 6.12.0-55.58.1.el10_0, kernel-devel-matched 6.12.0-55.58.1.el10_0, kernel-64k-devel-matched 6.12.0-55.58.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.38.1.el10_1, kernel-64k 6.12.0-124.38.1.el10_1, kernel-core 6.12.0-124.38.1.el10_1, kernel-tools 6.12.0-124.38.1.el10_1, kernel-modules 6.12.0-124.38.1.el10_1, kernel-64k-core 6.12.0-124.38.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.58.1.el10_0, kernel-64k 6.12.0-55.58.1.el10_0, kernel-core 6.12.0-55.58.1.el10_0, kernel-tools 6.12.0-55.58.1.el10_0, kernel-modules 6.12.0-55.58.1.el10_0, kernel-64k-core 6.12.0-55.58.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.38.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.38.1.el10_1
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.58.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.58.1.el10_0
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.38.1.el10_1, kernel-rt-64k 6.12.0-124.38.1.el10_1, kernel-rt-core 6.12.0-124.38.1.el10_1, kernel-rt-modules 6.12.0-124.38.1.el10_1, kernel-rt-64k-core 6.12.0-124.38.1.el10_1, kernel-rt-debug-core 6.12.0-124.38.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.58.1.el10_0, kernel-rt-64k 6.12.0-55.58.1.el10_0, kernel-rt-core 6.12.0-55.58.1.el10_0, kernel-rt-modules 6.12.0-55.58.1.el10_0, kernel-rt-64k-core 6.12.0-55.58.1.el10_0, kernel-rt-debug-core 6.12.0-55.58.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:1727
show 3 more
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.38.1.el10_1, kernel-rt-core 6.12.0-124.38.1.el10_1, kernel-rt-modules 6.12.0-124.38.1.el10_1, kernel-rt-debug-core 6.12.0-124.38.1.el10_1, kernel-rt-modules-core 6.12.0-124.38.1.el10_1, kernel-rt-debug-modules 6.12.0-124.38.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:2721
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.58.1.el10_0, kernel-rt-kvm 6.12.0-55.58.1.el10_0, kernel-rt-core 6.12.0-55.58.1.el10_0, kernel-rt-modules 6.12.0-55.58.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.58.1.el10_0, kernel-rt-debug-core 6.12.0-55.58.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:1727
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.