CVE-2026-98113 ksmbd: rate limit unmapped SID errors

What is CVE-2026-98113?

CVE-2026-98113 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: rate limit unmapped SID errors

A client can include many structurally valid but unmapped SIDs in a DACL. Logging every mapping failure lets one request generate hundreds of kernel error messages.

Rate limit the message to prevent an authenticated client from flooding the kernel log.

Weakness: CWE-770

Which versions are affected by CVE-2026-98113?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-98113?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-98113 being exploited?

There is no known exploitation of CVE-2026-98113 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-104607, BELL-CVE-2026-98113, DEBIAN-CVE-2026-98113, GHSA-vpc3-747g-g72v, UBUNTU-CVE-2026-98113.