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Linux Kernel CVE-2025-38382

MEDIUM
Use of Uninitialized Resource (CWE-908)
2025-07-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Debian Red Hat Debian Linux Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

Local triggering via btrfs log replay requires low privilege; sole impact is kernel crash with no data exposure or scope change.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
4.1 MEDIUM
AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:55 vuln.today
CVE Published
Jul 25, 2025 - 13:15 nvd
MEDIUM 5.5

DescriptionNVD

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

btrfs: fix iteration of extrefs during log replay

At __inode_add_ref() when processing extrefs, if we jump into the next label we have an undefined value of victim_name.len, since we haven't initialized it before we did the goto. This results in an invalid memory access in the next iteration of the loop since victim_name.len was not initialized to the length of the name of the current extref.

Fix this by initializing victim_name.len with the current extref's name length.

AnalysisAI

Btrfs log replay in the Linux kernel crashes due to use of an uninitialized variable in extended reference (extref) iteration, causing a kernel denial of service for local users. In __inode_add_ref(), a goto jump skips the initialization of victim_name.len, so the next loop iteration reads an undefined stack value and performs an invalid memory access. No public exploit code exists and EPSS places exploitation probability at 0.16% (5th percentile), confirming negligible active-exploitation risk; this is not listed in the CISA KEV catalog.

Technical ContextAI

Btrfs (B-tree filesystem) implements a write-ahead log used to replay journaled operations after an unclean shutdown. During log replay, __inode_add_ref() iterates over extended references (extrefs), a btrfs data structure used when an inode's hardlink count exceeds the inline reference limit. A goto statement within the iteration loop bypasses the line that initializes victim_name.len with the current extref's name length. On the subsequent iteration, the uninitialized len field - containing arbitrary stack data - drives a memory access, constituting a CWE-908 (Use of Uninitialized Resource) flaw. Affected CPEs cover multiple Linux kernel stable branches (cpe:2.3:o:linux:linux_kernel) as well as release candidates 6.16-rc1 through 6.16-rc4, and Debian Linux 11.0 LTS.

RemediationAI

The primary fix is to apply the upstream kernel stable patches. Five commits have been published: 2d11d274e2e1d7c79e2ca8461ce3ff3a95c11171, 539969fc472886a1d63565459514d47e27fef461, 54a7081ed168b72a8a2d6ef4ba3a1259705a2926, 7ac790dc2ba00499a8d671d4a24de4d4ad27e234, and aee57a0293dca675637e5504709f9f8fd8e871be - all available at git.kernel.org/stable. Debian Bullseye LTS administrators should apply the update announced at lists.debian.org/debian-lts-announce/2025/10/msg00008.html. No patched release version number is independently confirmed from available data; consult kernel.org or your distribution's security tracker for the minimum fixed release on your stable branch. As a partial compensating control where patching is not immediately possible, ensuring btrfs volumes are cleanly unmounted before shutdown reduces the likelihood of triggering log replay, though this is unreliable in crash scenarios and not a substitute for patching.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.6.17.8.103 Image SLES15-SP6 Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-BYOS-GCE Image SLES15-SP6-CHOST-BYOS Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-EC2 Image SLES15-SP6-CHOST-BYOS-GCE Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-EC2 Image SLES15-SP6-EC2-ECS-HVM Image SLES15-SP6-GCE Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-BYOS-GCE Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-HPC-GCE Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-Hardened-BYOS-GCE Image SLES15-SP6-SAP Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAP-GCE Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP6-SAPCAL-EC2 Image SLES15-SP6-SAPCAL-GCE Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.44 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.67 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.76 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 Affected
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-CHOST-BYOS-Aliyun Image SLES-CHOST-BYOS-Azure Image SLES-CHOST-BYOS-EC2 Image SLES-CHOST-BYOS-GCE Image SLES-CHOST-BYOS-GDC Image SLES-CHOST-BYOS-SAP-CCloud Image SLES-EC2 Image SLES-EC2-ECS Image SLES-GCE Image SLES-GCE-3P Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected

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CVE-2025-38382 vulnerability details – vuln.today
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