SB2026080614 - Double free in Linux kernel ipv6
Published: August 6, 2026
Security Bulletin ID
SB2026080614
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) Double free (CVE-ID: CVE-2026-64580)
CWE-ID: CWE-415 - Double Free
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 double free in xfrm6_fill_dst() when handling an error path after in6_dev_get(dev) returns NULL. A local user can trigger network operations that reach the affected code path to cause a denial of service.
The issue underflows a net_device reference count and can lead to kernel warnings while waiting for the device to become free.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2
- https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185
- https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf
- https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f
- https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6