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CVE-2022-3564· NVD / CVE Program· CNA VulDB

Linux Kernel Bluetooth l2cap_core.c l2cap_reassemble_sdu use after free

Noroxi assessment

Priority: Monitor (action score 28/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.4% (FIRST EPSS); higher than 73% of all records.
  • Someone on the same network segment can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: bpftool (AlmaLinux:8) 4.18.0-477.10.1.el8_8; kernel (AlmaLinux:8) 4.18.0-477.10.1.el8_8; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-477.10.1.el8_8.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to bpftool (AlmaLinux:8) 4.18.0-477.10.1.el8_8; kernel (AlmaLinux:8) 4.18.0-477.10.1.el8_8; kernel-abi-stablelists (AlmaLinux:8) 4.18.0-477.10.1.el8_8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability classified as critical was found in Linux Kernel. Affected by this vulnerability is the function l2cap_reassemble_sdu of the file net/bluetooth/l2cap_core.c of the component Bluetooth. The manipulation leads to use after free. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-211087.

HighCVSS 7.1 · v3.1—Proof of concept Fix available
Published
Oct 17, 2022
Updated
Oct 14, 2026
EPSS
1.4% · 73th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.4%

CNA vs NVD score

NVD
7.1
CNA · VulDB
5.5
1.6 point gap

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux
netapph300s firmware
netapph300s
netapph500s firmware
netapph500s
netapph700s firmware
netapph700s
netapph410s firmware
netapph410s

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • linux linux kernel4.10 and later · before 4.14.299
  • linux linux kernel4.15 and later · before 4.19.265
  • linux linux kernel4.20 and later · before 5.4.224
  • linux linux kernel5.5.0 and later · before 5.10.154
  • linux linux kernel5.11 and later · before 5.15.78
  • linux linux kernel5.16 and later · before 6.0.8
  • linux linux kernel3.6 and later · before 4.9.333
  • netapp h300s firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h700s firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Kernel

    • n/aaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernelbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-corebefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-cross-headersbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-debugbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-debug-corebefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-debug-develbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-develbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-docbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-modulesbefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-modules-extrabefore 4.18.0-477.10.1.el8_84.18.0-477.10.1.el8_8
AlmaLinux:8kernel-rtbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-corebefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-debugbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-debug-kvmbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-develbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8
AlmaLinux:8kernel-rt-kvmbefore 4.18.0-477.10.1.rt7.274.el8_84.18.0-477.10.1.rt7.274.el8_8

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:bpftool5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-abi-stablelists5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-core5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-cross-headers5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-debug5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-debug-core5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-debug-devel5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-debug-devel-matched5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-debug-modules5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-debug-modules-extra5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-devel5.14.0-162.18.1.el9_1 · AlmaLinux:9Package registry (OSV)
debian:linux6.0.8-1 · Debian:12Package registry (OSV)
debian:linux-5.105.10.158-2~deb10u1 · Debian:10Package registry (OSV)
opensuse:kernel-azure5.14.21-150400.14.31.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-rt5.14.21-150400.15.8.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
opensuse:kernel-source-azure5.14.21-150400.14.31.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:kernel-syms-azure5.14.21-150400.14.31.1 · openSUSE:Leap 15.4Package registry (OSV)
red hat:bpftool0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-147.80.1.el8_1 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)

+16

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02023-09-14

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+331 d
  3. TodayOct 17, 2026+1460 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records