PT-2021-7383 · Linux+3 · Linux Kernel+3

Rohit Keshri · Published 2021-09-02 · Updated 2025-06-17 · CVE-2021-20320

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description A flaw was found in the s390 eBPF JIT in the Linux kernel, specifically in the bpf jit insn function in arch/s390/net/bpf jit comp.c. This issue allows a local attacker with special user privileges to circumvent the verifier, potentially leading to a confidentiality problem. The flaw is related to information disclosure, enabling an attacker to access confidential data.

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

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

ALT-PU-2021-3330

ALT-PU-2021-3358

ALT-PU-2021-3563

ALT-PU-2021-3573

ALT-PU-2021-3660

ALT-PU-2022-1240

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

ALT-PU-2023-4894

BDU:2022-05888

CVE-2021-20320

OESA-2021-1429

SUSE-SU-2021:3969-1

SUSE-SU-2025:01983-1

SUSE-SU-2025_01983-1

Affected Products

Alt Linux

Astra Linux

Linux Kernel

Suse

References · 473

• https://nvd.nist.gov/vuln/detail/CVE-2021-20320 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-3760 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-20320 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:3969-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-0929 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-3896 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-3702 · Security Note
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20220829SE16 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-20320 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-16119 · Security Note
• https://osv.dev/vulnerability/OESA-2021-1429 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-20320 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-34981 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-43389 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-20320 · Vendor Advisory