PT-2021-8265 · Linux+2 · Linux Kernel+2

Yi Zhang · Published 2021-03-21 · Updated 2024-12-06 · CVE-2021-47041

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 versions 5.12.0-rc3 and earlier

Description The vulnerability is related to incorrect locking in the state change sk callback of the nvmet-tcp module. This can cause a deadlock when running nvmet-tcp and nvme-tcp on the same system, where state change callbacks on the host and on the controller side have a causal relationship. The issue is reported by lockdep with blktests, indicating an inconsistent lock state.

Recommendations To resolve this issue, update the Linux kernel to a version that includes the fix for the incorrect locking in the state change sk callback of the nvmet-tcp module. Specifically, versions later than 5.12.0-rc3 should include this fix. If updating is not possible, consider disabling the nvmet-tcp module or restricting its use to minimize the risk of exploitation.

Fix

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

BDU:2025-00803

CVE-2021-47041

OPENSUSE-SU-2024_1642-1

SUSE-SU-2024:1642-1

SUSE-SU-2024:1645-1

SUSE-SU-2024:1650-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 128

• https://osv.dev/vulnerability/SUSE-SU-2024:1650-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47041 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:1642-1 · Vendor Advisory
• https://git.kernel.org/stable/c/60ade0d56b06537a28884745059b3801c78e03bc · Patch
• https://git.kernel.org/stable/c/999d606a820c36ae9b9e9611360c8b3d8d4bb777 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:1645-1 · Vendor Advisory
• https://git.kernel.org/stable/c/06beaa1a9f6e501213195e47c30416032fd2bbd5 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47041 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47041 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-00803 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47041 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47041 · Vendor Advisory
• https://git.kernel.org/stable/c/b5332a9f3f3d884a1b646ce155e664cc558c1722 · Patch
• https://ubuntu.com/security/CVE-2021-47041 · Vendor Advisory