CVE-2026-98821: Linux kernel · block: reject polled dio with user integrity metadata
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in dd33c03cefccdfcb223e9e6262643d64f8c1ae20 : patch Linux kernel soon.
Data as of 26 Oct 2026, 17:16 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in dd33c03cefccdfcb223e9e6262643d64f8c1ae20, c97ef13ad96be0e08af38dfa2ed40cded0b53e1b, 6.17 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 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
Upgrade Linux kernel to dd33c03cefccdfcb223e9e6262643d64f8c1ae20, c97ef13ad96be0e08af38dfa2ed40cded0b53e1b, 6.17 or 2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
This vulnerability is fixed in Linux kernel version 6.17 and specific commits (dd33c03cefccdfcb223e9e6262643d64f8c1ae20, c97ef13ad96be0e08af38dfa2ed40cded0b53e1b, 2a42e6fe1293f2e2d579c9fe5bbab056dd8b880e). Users and administrators should upgrade to Linux kernel 6.17 or later to remediate this issue.
Description
CVE-2026-98821 is a vulnerability in the Linux kernel related to polled direct I/O (DIO) operations with user integrity metadata. The flaw occurs because the kernel incorrectly handles the iocb->private pointer when metadata I/O is involved, leading to a general protection fault during polling. This issue has been fixed in Linux kernel version 6.17 and related commits.