In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop caching unowned originator pointers in BAT IV BAT IV keeps the… (CVE-2026-46238)
In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop caching unowned originator pointers in BAT IV BAT IV keeps the last-hop neighbor address in each neigh_node, but some paths also cache an originator pointer derived from a temporary lookup. That pointer is not owned by the neigh_node and may no longer refer to a live originator entry after purge handling runs. Stop storing the auxiliary originator pointer in the BAT IV neighbor state. When BAT IV needs the neighbor originator data, resolve it from the stored neighbor address and drop the reference again after use. [sven: avoid bonding logic for outgoing OGM]
AI Analysis
Technical Summary
The Linux kernel's batman-adv module for BAT IV previously cached originator pointers in neighbor state structures that were not owned by those structures and could become stale after purge operations. This could lead to use of invalid pointers. The vulnerability was addressed by removing the caching of these auxiliary originator pointers and resolving originator data dynamically from the neighbor address when needed, dropping references immediately after use. This change prevents potential issues caused by stale or invalid originator pointers in the BAT IV implementation.
Potential Impact
The vulnerability could allow unauthorized access or manipulation of network routing data within the batman-adv mesh networking protocol due to stale or invalid originator pointers being used. The CVSS vector indicates a critical severity with high impact on confidentiality, integrity, and availability. However, no known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later patched versions. Users should update their Linux kernel to these or newer versions to remediate this vulnerability. Since this is not a cloud service, manual patching is required. Patch status is confirmed by the presence of fixed versions in the affectedVersions list.
In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop caching unowned originator pointers in BAT IV BAT IV keeps the… (CVE-2026-46238)
Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop caching unowned originator pointers in BAT IV BAT IV keeps the last-hop neighbor address in each neigh_node, but some paths also cache an originator pointer derived from a temporary lookup. That pointer is not owned by the neigh_node and may no longer refer to a live originator entry after purge handling runs. Stop storing the auxiliary originator pointer in the BAT IV neighbor state. When BAT IV needs the neighbor originator data, resolve it from the stored neighbor address and drop the reference again after use. [sven: avoid bonding logic for outgoing OGM]
CVSS v3.1
Score 8.8high
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's batman-adv module for BAT IV previously cached originator pointers in neighbor state structures that were not owned by those structures and could become stale after purge operations. This could lead to use of invalid pointers. The vulnerability was addressed by removing the caching of these auxiliary originator pointers and resolving originator data dynamically from the neighbor address when needed, dropping references immediately after use. This change prevents potential issues caused by stale or invalid originator pointers in the BAT IV implementation.
Potential Impact
The vulnerability could allow unauthorized access or manipulation of network routing data within the batman-adv mesh networking protocol due to stale or invalid originator pointers being used. The CVSS vector indicates a critical severity with high impact on confidentiality, integrity, and availability. However, no known exploits in the wild have been reported.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later patched versions. Users should update their Linux kernel to these or newer versions to remediate this vulnerability. Since this is not a cloud service, manual patching is required. Patch status is confirmed by the presence of fixed versions in the affectedVersions list.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46238
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a01a091ae9bcd3f805937
Added to database: 07/17/2026, 10:19:12 UTC
Last enriched: 07/30/2026, 14:53:56 UTC
Last updated: 07/31/2026, 19:30:21 UTC
Views: 2
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