Information disclosure in Linux kernel - CVE-2026-99201
Published: October 29, 2026
Vulnerability identifier: #VU158376
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99201
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose the kernel address of init_net.
The vulnerability exists due to information exposure through hashing a raw network namespace pointer in the netlink rhashtable key when exposing hash table bucket order through /proc/net/netlink and socket diagnostics. A local user can bind and rebind chosen NETLINK_USERSOCK port IDs to identify matching buckets, recover low bits of the Jenkins hash, and search the hash seed and possible kernel-image slides offline to recover the address of init_net.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99201
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2