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NVD / CVE Program· CNA Linux

CVE-2023-53827: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.41% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1351551aa9058e07a20a27a158270cf84fcde621, 348d446762e7c70778df8bafbdf3fa0df2123f58, a2a9339e1c9deb7e1e079e12e27a0265aea8421a.

Low priority for now. Upgrade to Linux Linux 1351551aa9058e07a20a27a158270cf84fcde621, 348d446762e7c70778df8bafbdf3fa0df2123f58, a2a9339e1c9deb7e1e079e12e27a0265aea8421a 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

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} Similar to commit d0be8347c623 ("Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put"), just use l2cap_chan_hold_unless_zero to prevent referencing a channel that is about to be destroyed.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Dec 9, 2025
Updated
Oct 15, 2026
EPSS
0.4% · 36th percentile
CWE
—

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

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
  • No public exploit code on record
  • A fix has been released

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

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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.

—

Versions reported by the vendor

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

  • Linux Linux

    • 3.5affected
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before f2d38e77aa5f3effc143e7dd24da8acf02925958affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before 1351551aa9058e07a20a27a158270cf84fcde621affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before c02421992505c95c7f3c9ad59ee35e22eac60988affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before d9ba36c22a7bb09d6bac4cc2f243eff05da53f43affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before ac6725a634f7e8c0330610a8527f20c730b61115affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before 348d446762e7c70778df8bafbdf3fa0df2123f58affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before d82a439c3cfdb28aa7e82e2e849c5c4dd9fca284affected · git
    • 61d6ef3e3408cdf7e622646fb90a9f7f9560b943 and later · before a2a9339e1c9deb7e1e079e12e27a0265aea8421aaffected · git
    • before 3.5not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.25-16.1.25-1
Red Hat:rhel_aus:8.2::baseosbpftoolbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseosbpftool-debuginfobefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernelbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-abi-whitelistsbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-corebefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debugbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-corebefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-debuginfobefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-develbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-modulesbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-modules-extrabefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debuginfobefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-develbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-docbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-modulesbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-modules-extrabefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-toolsbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-tools-debuginfobefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-tools-libsbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseosperfbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseosperf-debuginfobefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2
Red Hat:rhel_aus:8.2::baseospython3-perfbefore 0:4.18.0-193.187.1.el8_20:4.18.0-193.187.1.el8_2

+33

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-53823Dec 9, 2025 · block/rq_qos: protect rq_qos apis with a new lock
    31Monitor
  • ← EarlierCVE-2023-53824Dec 9, 2025 · netlink: annotate lockless accesses to nlk->max_recvmsg_len
    31Monitor
  • Later →CVE-2023-53828Dec 9, 2025 · Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()
    31Monitor

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
Linux Linux1351551aa9058e07a20a27a158270cf84fcde621Vendor (CNA)
Linux Linux348d446762e7c70778df8bafbdf3fa0df2123f58Vendor (CNA)
Linux Linuxa2a9339e1c9deb7e1e079e12e27a0265aea8421aVendor (CNA)
Linux Linuxac6725a634f7e8c0330610a8527f20c730b61115Vendor (CNA)
Linux Linuxc02421992505c95c7f3c9ad59ee35e22eac60988Vendor (CNA)
Linux Linuxd82a439c3cfdb28aa7e82e2e849c5c4dd9fca284Vendor (CNA)
Linux Linuxd9ba36c22a7bb09d6bac4cc2f243eff05da53f43Vendor (CNA)
Linux Linuxf2d38e77aa5f3effc143e7dd24da8acf02925958Vendor (CNA)
debian:linux6.1.25-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-305.186.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
suse:kernel-default5.3.18-150300.59.238.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:kernel-default-base5.3.18-150300.59.238.1.150300.18.142.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:kernel-rt5.3.18-150300.238.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:kernel-source4.12.14-122.296.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-source-rt5.3.18-150300.238.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:kernel-syms4.12.14-122.296.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_781-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

No commit or PR link among the references.

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).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records