Signed to Unsigned Conversion Error in Linux kernel - CVE-2026-64089

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Main Vulnerability Database Vulnerabilities #VU138552

Signed to Unsigned Conversion Error in Linux kernel - CVE-2026-64089

Published: July 20, 2026


Vulnerability identifier: #VU138552
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64089
CWE-ID: CWE-195
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an integer signedness error in batadv_send_my_tt_response() and batadv_tt_prepare_tvlv_local_data() when processing a translation table changeset length value larger than 32767. A local user can trigger the vulnerable code path to disclose sensitive information.

The issue occurs because a negative sign-extended length can cause a full-sized buffer to be allocated while only a small portion is populated, leaving the remaining bytes uninitialized.


Affected software

Linux kernel
Ubuntu
openEuler
kernel-source
bpftool-debuginfo
bpftool
kernel
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
kernel-extra-modules
linux-ibm (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-64089

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-source - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
bpftool-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
bpftool - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-debugsource - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-devel - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-headers - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-tools - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-tools-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
kernel-tools-devel - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
perf - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
perf-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
python3-perf - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
python3-perf-debuginfo - addressed in versions 5.10.0-331.0.0.232, 6.6.0-145.3.29.160
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1117.126
kernel-extra-modules - update to 6.6.0-145.3.29.160
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins