CVE-2026-98004: Linux kernel · iommu/riscv: Serialize command queue publishing
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ca58afa40946acd252a50fa4d4a86f15847a3d7d : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:07 UTC
Rated Medium 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 ca58afa40946acd252a50fa4d4a86f15847a3d7d, 787405e9e7bdc53ea7e063fe7b855171b4bd0e91, 6d4c12ab9ab8db87411c863a54e0e97f9197afde
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
Upgrade Linux kernel to ca58afa40946acd252a50fa4d4a86f15847a3d7d, 787405e9e7bdc53ea7e063fe7b855171b4bd0e91 or 6d4c12ab9ab8db87411c863a54e0e97f9197afde.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in the Linux kernel versions identified by the commits ca58afa40946acd252a50fa4d4a86f15847a3d7d, 787405e9e7bdc53ea7e063fe7b855171b4bd0e91, and 6d4c12ab9ab8db87411c863a54e0e97f9197afde. Users should update to these fixed versions or later to remediate the vulnerability.
Description
A vulnerability in the Linux kernel's iommu/riscv component related to command queue publishing has been resolved. The issue involved improper serialization of command queue publishing, which could cause software producer state to advance prematurely before commands were fully written and hardware tail updated. The fix ensures serialization so that the state advances only after these steps, and waits for hardware consumption outside the queue lock to prevent CPU blocking during long polls.