Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() ipv4_sysctl_exit_net() is currently freeing net->ipv4.sysctl_local_reserved_ports too soon. Only after unregister_net_sysctl_table() we can be sure no threads can possibly use the sysctls, including /proc/sys/net/ipv4/ip_local_reserved_ports.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/155f90be5ee8be5b110ebc0b7da33c54c83b0208 Patch
- git.kernel.org/stable/c/5b23a2ff379e70b6b9ff744a972b63e1f8f4d996 Patch
- git.kernel.org/stable/c/6512c57c4638ddec113bf42439361ba85a12048d Patch
- git.kernel.org/stable/c/87a1e0fe7776da7ab411be332b4be58ac8840d10 Patch
- git.kernel.org/stable/c/8e59d4d0dcde2dfb07a7ef855c849a2a0560aa57 Patch
- git.kernel.org/stable/c/a0ffc6081a8b27082dd5eae5aa1e3f59bbecf06c Patch
- git.kernel.org/stable/c/a7f4eefb6e1458431eef9fa20fb363320d185f76 Patch
- git.kernel.org/stable/c/ecf45080a4d3f4526cacb8b14060fe3b49a6913b Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 14 November 2026
- CWE
- CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.