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Linux Kernel CVE-2025-40053

HIGH
2025-10-28 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Denial Of Service Linux D-Link Red Hat Suse
7.5
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.9 MEDIUM

Trigger requires SKB allocation failure under memory pressure rather than an attacker-controlled packet, so AC:H; availability-only kernel crash gives A:H with C:N/I:N.

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

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 07:52 vuln.today
CVE Published
Oct 28, 2025 - 12:15 cve.org
HIGH 7.5

DescriptionCVE.org

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

net: dlink: handle copy_thresh allocation failure

The driver did not handle failure of netdev_alloc_skb_ip_align(). If the allocation failed, dereferencing skb->protocol could lead to a NULL pointer dereference.

This patch tries to allocate skb. If the allocation fails, it falls back to the normal path.

Tested-on: D-Link DGE-550T Rev-A3

AnalysisAI

Denial of service in the Linux kernel's D-Link dl2k Gigabit Ethernet driver (net/dlink, as used with hardware such as the D-Link DGE-550T) arises because the receive path did not check the return value of netdev_alloc_skb_ip_align() on the copy_thresh small-packet path; on allocation failure the code dereferenced skb->protocol, causing a NULL pointer dereference and kernel crash. Affected systems are Linux hosts using the dl2k driver for legacy D-Link Gigabit NICs. There is no public exploit identified at time of analysis and the vulnerability is not in CISA KEV; EPSS is low (0.21%, 11th percentile), consistent with a memory-pressure-dependent local DoS rather than a readily weaponizable remote flaw.

Technical ContextAI

The flaw lives in the mainline Linux dl2k driver (drivers/net/ethernet/dlink/dl2k.c), which supports older D-Link/Sundance-based Gigabit adapters like the DGE-550T. On the receive interrupt path, when an incoming frame is smaller than the copy_thresh threshold the driver copies it into a freshly allocated SKB via netdev_alloc_skb_ip_align(). That allocator can return NULL under memory pressure, and the original code proceeded to read skb->protocol without a NULL check - a classic CWE-476 (NULL Pointer Dereference) unchecked-return-value defect. Because it executes in softirq/interrupt context, a NULL dereference here panics or oopses the kernel rather than merely failing a single packet. The upstream fix reworks the path to attempt allocation and fall back to the normal (non-copy) receive path when allocation fails. CWE is not populated in the source data (CWE: N/A); NULL pointer dereference is inferred from the description.

Affected ProductsAI

The affected component is the Linux kernel's dl2k (D-Link) Ethernet driver, validated against D-Link DGE-550T Rev-A3 hardware per the commit. No exact vulnerable version range or CPE was provided in the source data; the seven git.kernel.org/stable commit references (5aa9b88, 7ed5010, 8169a60, 84fd710, 9d49e4b, ea87151, fd7b6b2) indicate the fix was backported across multiple stable kernel series, implying a broad range of prior kernels are affected. Any Linux system compiled with and using the dl2k driver for a supported D-Link/Sundance Gigabit NIC should be considered potentially affected; exact affected versions could not be confirmed from the available data.

RemediationAI

Upstream fix available (PR/commit); a released patched version is not independently confirmed from the provided data - apply the kernel stable update that includes the dl2k fix (see the git.kernel.org/stable commits, e.g. https://git.kernel.org/stable/c/5aa9b885602811a026a3f45c92ea2b4b04c54f09 and the six sibling backports 7ed5010, 8169a60, 84fd710, 9d49e4b, ea87151, fd7b6b2) by upgrading to your distribution's kernel package that incorporates them. Because the driver is only reachable when the dl2k module is loaded, the most effective compensating control on hosts not using legacy D-Link Gigabit NICs is to blacklist/unload the dl2k module (e.g. add it to modprobe blacklist), which fully removes the code path at the cost of disabling any DGE-550T-class adapter that relies on it. Reducing memory pressure and enabling watchdog/kdump for rapid recovery are secondary measures but do not eliminate the defect. Do not rely on network filtering, as the trigger is allocation failure rather than a specific packet.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:latest Container suse/sl-micro/6.1/baremetal-os-container:latest Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.95 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.80 Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.115 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.83 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.146 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.91 Affected
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

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CVE-2025-40053 vulnerability details – vuln.today
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