PT-2025-30840 · Linux+1 · Linux Kernel+1

Published 2025-05-30 · Updated 2025-07-25 · CVE-2025-38433

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 runtime fixup 32 function does not correctly handle cases where val is zero, potentially leading to an invalid pointer and a kernel panic when accessing it. This occurs because the logic allows the emission of two nop instructions, leaving garbage in a register intended to hold the upper 32 bits of a pointer. The issue arises from incomplete logic following the conversion of a lui instruction into a nop.

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

Exploit

Use of Insufficiently Random Values

NULL Pointer Dereference

Weakness Enumeration

CWE-330

CWE-476

Related Identifiers

BDU:2025-11507

CVE-2025-38433

Affected Products

Astra Linux

Linux Kernel

References · 14

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38433.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-38433 · Vendor Advisory
• https://git.kernel.org/stable/c/0a24b00dcde83934a3cc13e4c6b775522903496b · Patch
• https://git.kernel.org/stable/c/8d90d9872edae7e78c3a12b98e239bfaa66f3639 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-38433 · Security Note
• https://ubuntu.com/security/CVE-2025-38433 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-11507 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-38433 · Security Note
• https://osv.dev/vulnerability/CVE-2025-38433 · Vendor Advisory
• https://git.kernel.org/linus/8d90d9872edae7e78c3a12b98e239bfaa66f3639 · Note
• https://twitter.com/CVEnew/status/1948759081818214661 · Twitter Post
• https://lore.kernel.org/linux-cve-announce/2025072511-CVE-2025-38433-6d14@gregkh · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://access.redhat.com/security/cve/cve-2025-38433 · Note