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Linux Kernel CVE-2025-39941

| EUVDEUVD-2025-32389 MEDIUM
Race Condition (CWE-362)
2025-10-04 416baaa9-dc9f-4396-8d5f-8c081fb06d67
4.7
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.7 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
EUVD ID Assigned
Mar 13, 2026 - 19:56 euvd
EUVD-2025-32389
Analysis Generated
Mar 13, 2026 - 19:56 vuln.today
PoC Detected
Jan 23, 2026 - 20:37 vuln.today
Public exploit code
Patch released
Jan 23, 2026 - 20:37 nvd
Patch available
CVE Published
Oct 04, 2025 - 08:15 nvd
MEDIUM 4.7

DescriptionCVE.org

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

zram: fix slot write race condition

Parallel concurrent writes to the same zram index result in leaked zsmalloc handles. Schematically we can have something like this:

CPU0 CPU1 zram_slot_lock() zs_free(handle) zram_slot_lock() zram_slot_lock() zs_free(handle) zram_slot_lock()

compress compress handle = zs_malloc() handle = zs_malloc() zram_slot_lock zram_set_handle(handle) zram_slot_lock zram_slot_lock zram_set_handle(handle) zram_slot_lock

Either CPU0 or CPU1 zsmalloc handle will leak because zs_free() is done too early. In fact, we need to reset zram entry right before we set its new handle, all under the same slot lock scope.

Analysis

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

zram: fix slot write race condition

Parallel concurrent writes to the same zram index result in leaked zsmalloc handles. Schematically we can have something like this:

CPU0 CPU1 zram_slot_lock() zs_free(handle) zram_slot_lock() zram_slot_lock() zs_free(handle) zram_slot_lock()

compress compress handle = zs_malloc() handle = zs_malloc() zram_slot_lock zram_set_handle(handle) zram_slot_lock zram_slot_lock zram_set_handle(handle) zram_slot_lock

Either CPU0 or CPU1 zsmalloc handle will leak because zs_free() is done too early. In fact, we need to reset zram entry right before we set its new handle, all under the same slot lock scope.

Technical ContextAI

A race condition occurs when the behavior of software depends on the timing of events, such as the order of execution of threads or processes.

RemediationAI

A vendor patch is available — apply it immediately. Use proper synchronization mechanisms (locks, mutexes, atomic operations). Implement file locking for filesystem operations. Avoid TOCTOU patterns.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2025-39941 vulnerability details – vuln.today

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