CVE-2026-46233
Analyzed Analyzed - Analysis Complete
Memory Leak in Linux Kernel batman-adv BLA Component

Publication date: 2026-05-28

Last updated on: 2026-06-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: only purge non-released claims When batadv_bla_purge_claims() goes through the list of claims, it is only traversing the hash list with an rcu_read_lock(). Due to a potential parallel batadv_claim_put(), it can happen that it encounters a claim which was actually in the process of being released+freed by batadv_claim_release(). In this case, backbone_gw is set to NULL before the delayed RCU kfree is started. Calling batadv_bla_claim_get_backbone_gw() is then no longer allowed because it would cause a NULL-ptr derefence. To avoid this, only claims with a valid reference counter must be purged. All others are already taken care of.
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Meta Information
Published
2026-05-28
Last Modified
2026-06-10
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46233
EUVD
EUVD-2026-32751
Affected Vendors & Products
Showing 10 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel From 5.16 (inc) to 6.1.175 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.209 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.140 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.32 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.90 (exc)
linux linux_kernel From 6.19 (inc) to 7.0.9 (exc)
linux linux_kernel From 3.5 (inc) to 5.10.258 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability exists in the Linux kernel's batman-adv component, specifically in the handling of claims within the bla (batadv_bla) module.

The function batadv_bla_purge_claims() traverses a list of claims using an rcu_read_lock(). However, due to concurrent operations by batadv_claim_put(), it may encounter a claim that is in the process of being released and freed by batadv_claim_release().

In such cases, the backbone_gw pointer is set to NULL before the delayed RCU kfree is executed. If batadv_bla_claim_get_backbone_gw() is called on such a claim, it results in a NULL pointer dereference, causing a potential crash or undefined behavior.

The fix ensures that only claims with a valid reference counter are purged, preventing access to claims that are already being freed.

Impact Analysis

This vulnerability can lead to a NULL pointer dereference in the Linux kernel's batman-adv module.

Such a NULL pointer dereference can cause the kernel to crash or behave unpredictably, potentially leading to denial of service (DoS) conditions on affected systems.

Systems relying on the batman-adv module for mesh networking or related functionality may experience instability or outages due to this issue.

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