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CVE Record

CVE-2026-46208: batman-adv: stop tp_meter sessions during mesh teardown

In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop tp_meter sessions during mesh teardown TP meter sessions remain linked on bat_priv->tp_list after the netlink request has already finished. When the mesh interface is removed, batadv_mesh_free() currently tears down the mesh without first draining these sessions. A running sender thread or a late incoming tp_meter packet can then keep processing against a mesh instance which is already shutting down. Synchronize tp_meter with the mesh lifetime by stopping all active sessions from batadv_mesh_free() and waiting for sender threads to exit before teardown continues.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux batman-adv mesh can continue handling throughput-meter sessions while the mesh interface is being removed. That lifetime mismatch may let local, low-privileged activity affect confidentiality, integrity, or availability. Systems not using the affected batman-adv functionality are unlikely to be exposed.

Executive priority

Prioritize affected multi-user or otherwise locally accessible mesh systems. Patch through normal expedited kernel maintenance after confirming vendor applicability. Internet-only exposure is not supported by the supplied local-attack vector.

Technical view

Active tp_meter sessions remain linked after their netlink request completes. During batadv_mesh_free(), a sender thread or late tp_meter packet may continue processing against a mesh instance already shutting down. The kernel fix stops active sessions and waits for sender threads before teardown proceeds.

Likely exposure

Exposure requires an affected Linux kernel using batman-adv, with tp_meter activity overlapping mesh-interface teardown. The supplied CVSS vector indicates local access and low privileges are required, without user interaction. The bundle's version data is ambiguous, so exact kernel and distribution builds require branch-specific verification.

Exploitation context

The supplied CVSS score is 7.8. CISA KEV status is false, and the supplied sources provide no evidence of active exploitation or a public exploit. Practical exploitability and demonstrated impact are not established by this bundle.

Researcher notes

This is a mesh-lifetime synchronization flaw involving tp_list, sender threads, late packets, and batadv_mesh_free(). The description does not explicitly classify the resulting memory-safety condition, and no CWE is supplied. Avoid assigning a more specific weakness without additional evidence.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable referenced stable fix.
  • Consult the Linux distribution or kernel vendor for exact fixed-build guidance.
  • Until patched, restrict low-privileged access to systems using batman-adv mesh functionality.
  • Where operationally feasible, avoid tp_meter activity during mesh-interface teardown.

Validation and detection

  • Inventory running kernel builds and identify systems using batman-adv mesh interfaces.
  • Compare each exact build with vendor guidance and the applicable stable commit.
  • Verify the patched teardown stops active tp_meter sessions and waits for sender threads.
  • Test mesh teardown during tp_meter activity in an isolated environment for faults or instability.
Prepared
Confidence
medium
Sources
10

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

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.

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CVE-2026-46208 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

1CVSS vectors
3Timeline events
0ADP providers
9Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-46208Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, 33a3bb4a3345bb511f9c69c913da95d4693e2a4eunaffected
LinuxLinux4.8, 0, 5.10.259, 5.15.210, 6.1.176, 6.6.140, 6.12.90, 6.18.32, 7.0.9, 7.1affected
Weakness

CWE details

No CWE listed

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