medium 5.5

CVE-2025-71135 json

md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()

published 2026-01-14 9 mo ago modified 2026-11-05 3 d ago also EUVD-2026-2467

cvss: 5.5; version 3.1, NVD
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

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

The variable mddev->private is first assigned to conf and then checked:

conf = mddev->private; if (!conf) ...

If conf is NULL, then mddev->private is also NULL. In this case, null-pointer dereferences can occur when calling raid5_quiesce():

raid5_quiesce(mddev, true); raid5_quiesce(mddev, false);

since mddev->private is assigned to conf again in raid5_quiesce(), and conf is dereferenced in several places, for example:

conf->quiesce = 0; wake_up(&conf->wait_for_quiescent);

To fix this issue, the function should unlock mddev and return before invoking raid5_quiesce() when conf is NULL, following the existing pattern in raid5_change_consistency_policy().

Patch / fix

fixed in 1 distros 4 links 3

Linux Linux 6.12.64, 6.18.4, 6.19

debian ubuntu suse opensuse

linux Debian 13 6.12.69-1
linux Debian 14 6.18.5-1

debian advisories DEBIAN-CVE-2025-71135

linux Ubuntu 24.04 LTS 6.8.0-110.110
linux Ubuntu 25.10 6.17.0-22.22
linux-aws Ubuntu 24.04 LTS 6.8.0-1052.55
linux-aws Ubuntu 25.10 6.17.0-1012.12
linux-gcp Ubuntu 24.04 LTS 6.8.0-1054.57
linux-gcp Ubuntu 25.10 6.17.0-1012.12
linux-gke Ubuntu 24.04 LTS 6.8.0-1050.56
linux-ibm Ubuntu 24.04 LTS 6.8.0-1051.51

ubuntu advisories UBUNTU-CVE-2025-71135

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-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-40.1
kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-40.1
kernel-rt Linux Micro 6.2 6.12.0-160000.26.1
kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.26.1
kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.26.1
kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.26.1
kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.26.1.160000.2.7
kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.26.1

suse advisories SUSE-SU-2026:20845-1 SUSE-SU-2026:20876-1 SUSE-SU-2026:20555-1 SUSE-SU-2026:20599-1 SUSE-SU-2026:20615-1 SUSE-SU-2026:20570-1

kernel-rt openSUSE Leap 16.0 6.12.0-160000.26.1
dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.26.1
kernel-64kb openSUSE Leap 16.0 6.12.0-160000.26.1
kernel-syms openSUSE Leap 16.0 6.12.0-160000.26.1
kernel-azure openSUSE Leap 16.0 6.12.0-160000.26.1
kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.26.1
kernel-source openSUSE Leap 16.0 6.12.0-160000.26.1
kernel-default openSUSE Leap 16.0 6.12.0-160000.26.1

opensuse advisories openSUSE-SU-2026:20287-1

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-2025-71135 updated 2026-11-05 cvss 5.5

kernel: md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()

Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
affected: no fix planned “Out of support scope”
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 Red Hat Enterprise Linux 10 kernel
affected: no fix available
Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 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

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 d ago (2026-11-05)

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
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

Linux Linux

Classification

Weakness

CWE-476 NULL Pointer Dereference

Technology feeds

Linux kernel rss critical rss

References

Sources

CVE List CVE-2025-71135
NVD CVE-2025-71135

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.

Summary