Security readout for executives and security teams
Plain-English summary
A Linux networking flaw can crash the kernel when GRE tunneling is combined with dynamically changing team or bonding interfaces. A crash could interrupt services or reboot a host. The supplied evidence does not establish remote reachability, required privileges, or data compromise.
Executive priority
Prioritize assessment and patching for network appliances, virtualization hosts, and critical Linux servers using these interface combinations. Treat this as an availability risk requiring timely remediation, but the supplied evidence does not justify an emergency, enterprise-wide response based on active exploitation.
Technical view
A packet buffer can be allocated with insufficient headroom before an IP GRE device changes interface header requirements. ipgre_header() may then push beyond the reserved buffer, triggering skb_under_panic and a kernel BUG.
Likely exposure
Potential exposure is limited to affected Linux kernels where IP GRE and dynamically changing team or bonding interfaces are used. The supplied version data is ambiguous, so distribution-specific kernel packages and backports require vendor confirmation.
Exploitation context
The crash was produced by syzbot under a constructed interface-change condition. The bundle reports no KEV listing and provides no evidence of active exploitation. It does not establish whether an unprivileged or remote attacker can trigger the flaw.
Researcher notes
The record provides a concrete kernel panic trace and multiple stable-tree fixes, but no CVSS, CWE, validated attack vector, privilege requirement, or reliable package-level affected matrix. The repeated commit hashes and mixed version entries should not be interpreted as definitive distribution exposure.
Mitigation direction
- Upgrade to a vendor-supported kernel containing the applicable upstream stable fix or backport.
- Reboot affected hosts after updating and confirm the patched kernel is running.
- If patching is delayed, consult vendor guidance before changing GRE, team, or bonding configurations.
Validation and detection
- Inventory running kernel versions and systems using IP GRE, team, or bonding interfaces.
- Confirm each kernel package contains the applicable fix through vendor advisories or changelogs.
- Check kernel logs for skb_under_panic, ipgre_header, or related kernel BUG events.
- Verify updated hosts booted into the intended patched kernel.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2026-23011 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
SSVC decision data
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/eeb9a521de40c6fadccc12fa5205e5a1b364d5a8CVE reference, Linux
- https://git.kernel.org/stable/c/8d5b6b2d79c1c22a5b0db1187a6439dff375a022CVE reference, Linux
- https://git.kernel.org/stable/c/2ecf0aa7cc262472a9599cc51ba02ada0897a17aCVE reference, Linux
- https://git.kernel.org/stable/c/06fe0801396a36cab865b34f666de1d65bc5ce8eCVE reference, Linux
- https://git.kernel.org/stable/c/aa57bfea4674e6da8104fa3a37760a6f5f255dadCVE reference, Linux
- https://git.kernel.org/stable/c/554201ed0a8f4d32e719f42caeaeb2735a9ed6caCVE reference, Linux
- https://git.kernel.org/stable/c/e67c577d89894811ce4dcd1a9ed29d8b63476667CVE reference, Linux
- https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlCVE reference, siemens-SADP
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.