CVE-2026-99041
Received
Received - Intake
Null Pointer Dereference in Linux Kernel ip6_gre Module
Vulnerability report for CVE-2026-99041, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-23
Last updated on: 2026-10-23
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
ip6_gre: remove obsolete ERSPAN PMTU update
A tc tunnel_key action can attach a METADATA_IP_TUNNEL dst to an skb,
and mirred can redirect it to a native ip6erspan device. The legacy PMTU
update in ip6erspan_tunnel_xmit() treats that metadata dst as a route.
Since it has no output device, dst_dev(dst)->mtu dereferences NULL.
On v7.2 with KASAN, an initial UID/GID 65534 process with CapEff 0 used
self-created user and network namespaces to trigger:
KASAN: null-ptr-deref
RIP: ip6erspan_tunnel_xmit+0x10fc/0x2cc0
Kernel panic - not syncing: Fatal exception in interrupt
The update is obsolete. Commit fe1a4ca0a2b7 ("ip6_gre: process toobig
in a better way") changed IPv6 GRE Too Big handling to update the
underlay route and removed the equivalent block from __gre6_xmit().
ip6_tnl_xmit() then propagates the underlay PMTU to the overlay route.
Remove the stale ERSPAN copy and its now-unused dst variable. This
eliminates the metadata-dst dereference and keeps ERSPAN aligned with
IPv6 GRE PMTU handling.
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 5a963eb61b7c39e6c422b6e48619d19d04719358 |
| Linux | Linux | 5a963eb61b7c39e6c422b6e48619d19d04719358 |
| Linux | Linux | 5a963eb61b7c39e6c422b6e48619d19d04719358 |
| Linux | Linux | 5a963eb61b7c39e6c422b6e48619d19d04719358 |
| Linux | Linux | 5a963eb61b7c39e6c422b6e48619d19d04719358 |
| Linux | Linux | 4.16 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
