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CVE-2025-39699

20
FAUCET Score

CVE-2025-39699 is a NULL pointer dereference vulnerability in the Linux kernel's RISC-V IOMMU component, specifically within the riscv_iommu_iova_to_phys() function, affecting Linux kernel versions. Rated Medium (CVSS 5.5), this local vulnerability requires low privileges and can lead to a denial of service (availability impact). There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.13, < 6.16.4CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
6.17CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
6.17CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.13%
Probability of exploitation in next 30 days
EPSS Percentile
2.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0013 is in the 19th percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2025-39699

kernel: iommu/riscv: prevent NULL deref in iova_to_phys

Sep 5, 2025

References

git.kernel.org / stable/c/220c491490255b656672bb572b18460cd9155926
Patch
git.kernel.org / stable/c/99d4d1a070870aa08163af8ce0522992b7f35d8c
Patch