PT-2025-36293 · Linux+1 · Linux Kernel+1

Published 2025-08-20 · Updated 2025-11-25 · CVE-2025-39699

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The riscv iommu pte fetch() function can return a NULL value for unmapped or never-mapped IOVAs. The riscv iommu iova to phys() function did not handle these NULL returns, leading to a potential null pointer dereference. The issue has been resolved by preventing the null pointer dereference and removing pte validation.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2026-03098

CVE-2025-39699

Affected Products

Astra Linux

Linux Kernel

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39699.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-39699 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-39699 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39699 · Security Note
• https://ubuntu.com/security/CVE-2025-39699 · Vendor Advisory
• https://git.kernel.org/stable/c/99d4d1a070870aa08163af8ce0522992b7f35d8c · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39699 · Vendor Advisory
• https://git.kernel.org/stable/c/220c491490255b656672bb572b18460cd9155926 · Patch
• https://cve.org/CVERecord?id=CVE-2025-39699 · Security Note
• https://bdu.fstec.ru/vul/2026-03098 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39699 · Vendor Advisory
• https://lore.kernel.org/linux-cve-announce/2025090548-CVE-2025-39699-4d8c@gregkh · Note
• https://t.me/cveNotify/144016 · Telegram Post
• https://twitter.com/CVEnew/status/1964195456390746220 · Twitter Post
• https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.16.4 · Note