PT-2024-21505 · Linux+2 · Linux Kernel+2

Published 2024-04-03 · Updated 2025-10-21 · CVE-2024-26765

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 version 6.6.17+

Description The issue is related to the Linux kernel's handling of interrupts on non-boot CPUs during hotplug operations. To silence warnings and avoid potential errors due to unexpected interrupts, the kernel now disables IRQ before init fn() for non-boot CPUs. This change affects the kernel's rcu cpu starting function and is specific to the LoongArch architecture. The problem arises when the CPU is tainted, and the kernel reports a warning at kernel/rcu/tree.c:4503. The warning is due to the rcu cpu starting function, which is called during CPU initialization. The issue is resolved by disabling IRQ before init fn() for non-boot CPUs when hotplug is used.

Recommendations For Linux kernel version 6.6.17+, update to a newer version that includes the fix for this issue. If an update is not available, consider disabling the hotplug feature for non-boot CPUs to minimize the risk of exploitation. However, this is not a recommended long-term solution, as it may limit the functionality of the system. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-399

Related Identifiers

BDU:2025-13312

CVE-2024-26765

DSA-5658-1

Affected Products

Astra Linux

Linux Kernel

Red Os

References · 20

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26765.json · Exploit
• https://osv.dev/vulnerability/BELL-CVE-2024-26765 · Vendor Advisory
• https://git.kernel.org/stable/c/8bf2ca8c60712af288b88ba80f8e4df4573d923f · Patch
• https://git.kernel.org/stable/c/1001db6c42e4012b55e5ee19405490f23e033b5a · Patch
• https://ubuntu.com/security/CVE-2024-26765 · Vendor Advisory
• https://git.kernel.org/stable/c/a262b78dd085dbe9b3c75dc1d9c4cd102b110b53 · Patch
• https://git.kernel.org/stable/c/dffdf7c783ef291eef38a5a0037584fd1a7fa464 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2024-26765 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2024-26765 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-26765 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2024-26765 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2024-26765 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-13312 · Security Note
• https://osv.dev/vulnerability/CVE-2024-26765 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5658-1 · Vendor Advisory