PT-2024-11355 · Linux+2 · Linux Kernel+2

Johan Hovold · Published 2021-09-14 · Updated 2024-12-26 · CVE-2021-47358

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description The issue arises from the Linux kernel's greybus uart component, where user space can hold a tty open indefinitely. Tty drivers must not release underlying structures until the last user is gone. To resolve this, the kernel now uses the tty-port reference counter to manage the lifetime of the greybus tty state, preventing use after free after a disconnect.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2025-07459

CVE-2021-47358

OPENSUSE-SU-2024_2189-1

SUSE-SU-2024:2008-1

SUSE-SU-2024:2011-1

SUSE-SU-2024:2019-1

SUSE-SU-2024:2189-1

SUSE-SU-2024:2190-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 1255

• https://git.kernel.org/stable/c/4dc56951a8d9d61d364d346c61a5f1d70b4f5e14 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2019-1 · Vendor Advisory
• https://git.kernel.org/stable/c/9872ff6fdce8b229f01993b611b5d1719cb70ff1 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2190-1 · Vendor Advisory
• https://git.kernel.org/stable/c/64062fcaca8872f063ec9da011e7bf30470be33f · Patch
• https://git.kernel.org/stable/c/92b67aaafb7c449db9f0c3dcabc0ff967cb3a42d · Patch
• https://cve.org/CVERecord?id=CVE-2021-47358 · Security Note
• https://bdu.fstec.ru/vul/2025-07459 · Security Note
• https://git.kernel.org/stable/c/b9e697e60ce9890e9258a73eb061288e7d68e5e6 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2008-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47358 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47358 · Vendor Advisory
• https://git.kernel.org/stable/c/92dc0b1f46e12cfabd28d709bb34f7a39431b44f · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47358 · Vendor Advisory
• https://git.kernel.org/stable/c/a5cfd51f6348e8fd7531461366946039c29c7e69 · Patch