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Fencer Vulns
high 7.5

CVE-2020-25661 json

A Red Hat only CVE-2020-12351 regression issue was found in the way the Linux kernel's Bluetooth implementation handled L2CAP packets with…

published 2020-11-05 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18323

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

A Red Hat only CVE-2020-12351 regression issue was found in the way the Linux kernel's Bluetooth implementation handled L2CAP packets with A2MP CID. This flaw allows a remote attacker in an adjacent range to crash the system, causing a denial of service or potentially executing arbitrary code on the system by sending a specially crafted L2CAP packet. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Patch / fix

  • kernel RHEL 8 4.18.0-240.1.1.el8_3
  • perf RHEL 8 4.18.0-240.1.1.el8_3
  • bpftool RHEL 8 4.18.0-240.1.1.el8_3
  • kernel-core RHEL 8 4.18.0-240.1.1.el8_3
  • kernel-tools RHEL 8 4.18.0-240.1.1.el8_3
  • python3-perf RHEL 8 4.18.0-240.1.1.el8_3
  • kernel-modules RHEL 8 4.18.0-240.1.1.el8_3
  • kernel-zfcpdump RHEL 8 4.18.0-240.1.1.el8_3

red hat advisories RHSA-2020:4685RHSA-2020:4686

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25661 updated cvss 8.8

kernel: Red Hat only CVE-2020-12351 regression

  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-240.1.1.el8_3, kernel-debuginfo-common-aarch64 4.18.0-240.1.1.el8_3, kernel-debuginfo-common-ppc64le 4.18.0-240.1.1.el8_3 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-240.1.1.el8_3, kernel 4.18.0-240.1.1.el8_3, bpftool 4.18.0-240.1.1.el8_3, kernel-core 4.18.0-240.1.1.el8_3, kernel-tools 4.18.0-240.1.1.el8_3, python3-perf 4.18.0-240.1.1.el8_3, +15 more
    fixed: vendor fix RHSA-2020:4685
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-core 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-modules 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-debug-core 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-debug-modules 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-modules-extra 4.18.0-240.1.1.rt7.55.el8_3, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-kvm 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-core 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-modules 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-debug-kvm 4.18.0-240.1.1.rt7.55.el8_3, kernel-rt-debug-core 4.18.0-240.1.1.rt7.55.el8_3, +4 more
    fixed: vendor fix RHSA-2020:4686
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.79% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 8.3 AV:A/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Red Hat kernel

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.