SB2026080619 - Use of Uninitialized Variable in Linux kernel ipv4
Published: August 6, 2026
Security Bulletin ID
SB2026080619
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of Uninitialized Variable (CVE-ID: CVE-2026-64576)
CWE-ID: CWE-457 - Use of Uninitialized Variable
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use of uninitialized memory in nh_res_bucket_migrate() when handling rtnetlink nexthop operations. A local user can send a specially crafted netlink message to cause a denial of service.
The issue can lead to a general protection fault and kernel panic when an error path dereferences an uninitialized extack message pointer.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66
- https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d
- https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e
- https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1
- https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715