CVE-2023-40283

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2023-08-14. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in l2cap_sock_release in net/bluetooth/l2cap_sock.c in the Linux kernel before 6.4.10. There is a use-after-free because the children of an sk are mishandled.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

August 14, 2023

Last Modified

February 25, 2026

References (20)

Vendor Advisories for CVE-2023-40283(8)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-azure (4.15.0.1170.136) @ trusty2026-05-24ubuntu
ubuntulinux-tools-oem-22.04b (6.0.0.1021.21) @ jammy2026-05-24ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.2.0.1011.13) @ jammy2026-05-24ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.84.81) @ jammy2026-05-24ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1030 (5.4.0-1030.34) @ focal2026-05-24ubuntu
ubuntulinux-tools-oem-22.04c (6.1.0.1021.21) @ jammy2026-05-24ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1044.50~20.04.1) @ focal2026-05-24ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.2.0.33.33) @ lunar2026-05-24ubuntu
ubuntulinux-tools-kvm (4.15.0.1145.136) @ bionic2026-05-24ubuntu
ubuntulinux-virtual-lts-xenial (4.4.0.245.213) @ trusty2026-05-24ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.218.202) @ bionic2026-05-24ubuntu
ubuntulowlatency-4.4 (4.4.0-168) @ xenial2026-05-24ubuntu
ubuntulinux-tools-raspi2-hwe-18.04-edge (5.4.0.1094.124) @ focal2026-05-24ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1038.36) @ jammy2026-05-24ubuntu
redhatkernel-0:4.18.0-305.130.1.el8_42024-04-30redhat
redhatkernel-rt-0:4.18.0-305.130.1.rt7.206.el8_42024-04-30redhat
redhatkernel-0:4.18.0-477.51.1.el8_82024-03-19redhat
redhatkernel-rt-0:5.14.0-70.93.1.rt21.165.el9_02024-03-13redhat
redhatkernel-0:5.14.0-70.93.2.el9_02024-03-12redhat
redhatkernel-0:4.18.0-193.128.1.el8_22024-03-12redhat
redhatkernel-rt-0:4.18.0-193.128.1.rt13.179.el8_22024-03-12redhat
redhatkernel-rt-0:4.18.0-513.18.1.rt7.320.el8_92024-02-20redhat
redhatkernel-0:4.18.0-513.18.1.el8_92024-02-20redhat
redhatkernel-0:4.18.0-372.91.1.el8_62024-02-07redhat
redhatkernel-0:5.14.0-284.48.1.el9_22024-01-25redhat
redhatkernel-0:5.14.0-362.18.1.el9_32024-01-25redhat
redhatkernel-rt-0:5.14.0-284.48.1.rt14.333.el9_22024-01-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(17)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 114 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
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  7. 2026-07-23 02:25 UTCEG score recompute
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  22. 2026-06-27 13:04 UTCOSV refresh
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  55. 2026-06-08 14:16 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-40283?
CVE-2023-40283 is a high vulnerability published on August 14, 2023. An issue was discovered in l2capsockrelease in net/bluetooth/l2cap_sock.c in the Linux kernel before 6.4.10. There is a use-after-free because the children of an sk are mishandled.
When was CVE-2023-40283 disclosed?
CVE-2023-40283 was first published in the National Vulnerability Database on August 14, 2023, with the most recent update on February 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-40283 actively exploited?
CVE-2023-40283 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.8% of all scored CVEs.
What is the CVSS score of CVE-2023-40283?
CVE-2023-40283 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-40283?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-40283, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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