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CVE Record

CVE-2025-22103: net: fix NULL pointer dereference in l3mdev_l3_rcv

In the Linux kernel, the following vulnerability has been resolved: net: fix NULL pointer dereference in l3mdev_l3_rcv When delete l3s ipvlan: ip link del link eth0 ipvlan1 type ipvlan mode l3s This may cause a null pointer dereference: Call trace: ip_rcv_finish+0x48/0xd0 ip_rcv+0x5c/0x100 __netif_receive_skb_one_core+0x64/0xb0 __netif_receive_skb+0x20/0x80 process_backlog+0xb4/0x204 napi_poll+0xe8/0x294 net_rx_action+0xd8/0x22c __do_softirq+0x12c/0x354 This is because l3mdev_l3_rcv() visit dev->l3mdev_ops after ipvlan_l3s_unregister() assign the dev->l3mdev_ops to NULL. The process like this: (CPU1) | (CPU2) l3mdev_l3_rcv() | check dev->priv_flags: | master = skb->dev; | | | ipvlan_l3s_unregister() | set dev->priv_flags | dev->l3mdev_ops = NULL; | visit master->l3mdev_ops | To avoid this by do not set dev->l3mdev_ops when unregister l3s ipvlan.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2025-22103 is a Linux kernel networking bug that can cause a NULL pointer dereference when an L3S ipvlan interface is deleted. The likely business impact is availability disruption on systems using this specialized networking feature. Public sources do not report active exploitation or data compromise.

Executive priority

Treat as a targeted availability risk, not a broad emergency. Patch in normal high-priority kernel maintenance windows, faster for container or network infrastructure using ipvlan L3S.

Technical view

The issue is a race in l3mdev_l3_rcv(): it checks device flags, while ipvlan_l3s_unregister() can set dev->l3mdev_ops to NULL before it is accessed. The upstream fix avoids clearing dev->l3mdev_ops during L3S ipvlan unregister. CVE data lists Linux kernel exposure and links stable kernel commits.

Likely exposure

Exposure is most relevant to Linux hosts using ipvlan in L3S mode. Container, virtualization, or network automation hosts that create and delete ipvlan interfaces should be reviewed first. Systems not using L3S ipvlan are less likely to be affected.

Exploitation context

The public record describes a crash condition during deletion of an L3S ipvlan interface. CISA KEV is false in the provided bundle, and no cited source reports active exploitation. Required privileges are not stated in the sources.

Researcher notes

The source bundle lacks CVSS, CWE, detailed version ranges, and privilege analysis. The safest validation path is commit-based or vendor-package confirmation. Avoid assuming exploitability beyond the documented NULL dereference during L3S ipvlan deletion.

Mitigation direction

  • Apply kernel updates that include the linked upstream stable fixes.
  • Prioritize Linux hosts using ipvlan L3S networking.
  • If packaged kernels are used, follow the Linux distribution vendor advisory.
  • Reduce unnecessary L3S ipvlan creation and deletion until patched.

Validation and detection

  • Inventory Linux kernel versions on hosts using ipvlan.
  • Check whether ipvlan L3S interfaces are deployed.
  • Confirm the running kernel includes one of the linked stable fixes.
  • Review kernel logs for NULL pointer dereference traces in l3mdev_l3_rcv or ipvlan unregister paths.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxc675e06a98a474f7ad0af32ce467613da818da52, c675e06a98a474f7ad0af32ce467613da818da52, c675e06a98a474f7ad0af32ce467613da818da52, c675e06a98a474f7ad0af32ce467613da818da52unaffected
LinuxLinux5.1, 0, 6.6.117, 6.12.46, 6.14.2, 6.15affected
Weakness

CWE details

No CWE listed

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