CVE-2026-98434 sysctl: Check range in proc_dointvec_ms_jiffies_minmax
A missing range check in the Linux kernel sysctl handler allows local attackers to bypass security constraints, potentially leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98434?
CVE-2026-98434 is a missing authorization vulnerability in Linux, published on 18 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
sysctl: Check range in proc_dointvec_ms_jiffies_minmax
Add the range check to do_proc_int_conv_ms_jiffies_minmax that commit d174174c6776 ("sysctl: replace SYSCTL_INT_CONV_CUSTOM macro with functions") incorrectly removed.
Which versions are affected by CVE-2026-98434?
How do I fix CVE-2026-98434?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-98434 being exploited?
There is no known exploitation of CVE-2026-98434 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-98434, GHSA-62hw-vfc3-fh7q, UBUNTU-CVE-2026-98434.