CVE-2026-98113: Linux kernel · ksmbd: rate limit unmapped SID errors
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:55 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that implements rate limiting on unmapped SID error messages in the ksmbd component of the Linux kernel. Users should apply the updated kernel versions that include this fix to prevent log flooding by authenticated clients.
Description
A vulnerability in the Linux kernel's ksmbd component allowed an authenticated client to flood the kernel log by including many structurally valid but unmapped SIDs in a DACL, causing excessive logging of mapping failures. This issue has been resolved by implementing rate limiting on these error messages to prevent log flooding.
References
- ubuntu.com/security/CVE-2026-98113 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98113 (opens in a new tab)
- git.kernel.org/stable/c/feca5e70fc963b088377b20879e8cd8237c2fd7d (opens in a new tab)
- git.kernel.org/stable/c/30dbb08777b9a611d7d9193c040f382fbd0e7562 (opens in a new tab)
- git.kernel.org/stable/c/54cb2a909996346ac6a8a3beac96c07b3dcba584 (opens in a new tab)
- git.kernel.org/stable/c/13af319c1efec0b45fb5c1b16830eb0888b3fd1e (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-98113 (opens in a new tab)
- git.kernel.org/stable/c/3005d43143096321cc857645a9d48ef4ffde8bcf (opens in a new tab)
- git.kernel.org/stable/c/486876f957456721b5e51af532235db4c6f7bd47 (opens in a new tab)
- git.kernel.org/stable/c/674aabf554bdaffcf25f145bf32c8b4f510f7916 (opens in a new tab)