In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets…
A vulnerability in the Linux kernel's batman-adv component allowed oversized TVLV packets to cause a buffer overflow due to an integer overflow in size calculation. This could lead to kernel memory corruption. The issue was fixed by changing the size calculation to use a wider type and adding checks to prevent oversized allocations.
AI Analysis
Technical Summary
The Linux kernel's batman-adv module had a vulnerability where the function batadv_tvlv_container_list_size() used a 16-bit unsigned integer (u16) to accumulate the size of TVLV packet sections. If the total size exceeded the maximum value of u16, the size would wrap around, causing an undersized memory allocation in batadv_tvlv_container_ogm_append(). Subsequent memory copy operations would then write beyond the allocated buffer, corrupting kernel memory. The fix involved changing the return type to size_t and adding a check against U16_MAX to abort processing if the size limit is exceeded.
Potential Impact
This vulnerability allows an attacker to cause kernel memory corruption by sending oversized TVLV packets, potentially leading to denial of service or arbitrary code execution with kernel privileges. The CVSS vector indicates the attack can be performed remotely with low complexity and no privileges or user interaction, impacting confidentiality, integrity, and availability with high severity.
Mitigation Recommendations
A fix is available that changes the size calculation type and adds boundary checks to prevent buffer overflows. Users should update their Linux kernel to versions 7.0.0-28.28~24.04.1 or later, as versions prior to these are affected. No additional mitigations are specified beyond applying the official patch.
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets…
Description
A vulnerability in the Linux kernel's batman-adv component allowed oversized TVLV packets to cause a buffer overflow due to an integer overflow in size calculation. This could lead to kernel memory corruption. The issue was fixed by changing the size calculation to use a wider type and adding checks to prevent oversized allocations.
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 had a vulnerability where the function batadv_tvlv_container_list_size() used a 16-bit unsigned integer (u16) to accumulate the size of TVLV packet sections. If the total size exceeded the maximum value of u16, the size would wrap around, causing an undersized memory allocation in batadv_tvlv_container_ogm_append(). Subsequent memory copy operations would then write beyond the allocated buffer, corrupting kernel memory. The fix involved changing the return type to size_t and adding a check against U16_MAX to abort processing if the size limit is exceeded.
Potential Impact
This vulnerability allows an attacker to cause kernel memory corruption by sending oversized TVLV packets, potentially leading to denial of service or arbitrary code execution with kernel privileges. The CVSS vector indicates the attack can be performed remotely with low complexity and no privileges or user interaction, impacting confidentiality, integrity, and availability with high severity.
Mitigation Recommendations
A fix is available that changes the size calculation type and adds boundary checks to prevent buffer overflows. Users should update their Linux kernel to versions 7.0.0-28.28~24.04.1 or later, as versions prior to these are affected. No additional mitigations are specified beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-52934
- 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: 6a5a017491ae9bcd3f8043c6
Added to database: 07/17/2026, 10:18:28 UTC
Last enriched: 07/30/2026, 15:39:20 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 1
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