CVE-2026-52931 Details
Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.
A vulnerability exists in the Linux kernel's batman-adv module, specifically within the throughput meter implementation. The issue arises because the functions batadv_tp_recv_ack() and batadv_tp_stop() are designed to operate only with tp_vars assigned the BATADV_TP_SENDER role. When these functions are mistakenly called with a BATADV_TP_RECEIVER role, they access sender-specific data that has not been initialized, resulting in undefined behavior. This vulnerability can be exploited when a node acting as a receiver in an active tp_meter session receives a crafted ACK packet. The vulnerability has been addressed by adding a check for tp_vars->role right after the lookup, ensuring that the function exits if the role is not BATADV_TP_SENDER, before accessing any sender-specific data.
Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for updating the kernel can be found in the official Linux documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee | kernel.org | Patch |
| https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b | kernel.org | Patch |
| https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142 | kernel.org | Patch |
| https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d | kernel.org | Patch |
| https://git.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91 | kernel.org | Patch |
| https://git.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.8, < 5.10.258 >= 5.11, < 5.15.209 >= 5.16, < 6.1.175 >= 6.2, < 6.6.142 >= 6.7, < 6.12.92 >= 6.13, < 6.18.34 >= 6.19, < 7.0.11 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jun 28, 2026 | CVE Modified | kernel.org |
| Jun 24, 2026 | New CVE Received | kernel.org |