CVE-2023-3776

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2023-07-21. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability.

We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
40.3%
KEV
Not listed

Published

July 21, 2023

Last Modified

February 13, 2025

References (18)

Vendor Advisories for CVE-2023-3776(7)

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

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oem-22.04c (6.1.0.1019.19) @ jammy2026-05-24ubuntu
ubuntulinux-virtual-lts-xenial (4.4.0.244.212) @ trusty2026-05-24ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.82.78) @ jammy2026-05-24ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1028 (5.4.0-1028.32) @ focal2026-05-24ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.2.0.31.31~22.04.8) @ jammy2026-05-24ubuntu
redhatkernel-0:2.6.32-754.53.1.el62024-04-16redhat
redhatkernel-0:3.10.0-1062.82.1.el72024-01-16redhat
redhatkpatch-patch2023-11-21redhat
redhatkernel-rt-0:4.18.0-193.119.1.rt13.170.el8_22023-11-21redhat
redhatkernel-0:4.18.0-372.80.1.el8_62023-11-21redhat
redhatkernel-rt-0:3.10.0-1160.105.1.rt56.1256.el72023-11-21redhat
redhatkernel-0:4.18.0-193.119.1.el8_22023-11-21redhat
redhatkernel-rt-0:5.14.0-70.80.1.rt21.151.el9_02023-11-21redhat
redhatkernel-0:5.14.0-70.80.1.el9_02023-11-21redhat
redhatkernel-0:3.10.0-1160.105.1.el72023-11-21redhat
redhatkernel-0:3.10.0-957.108.1.el72023-11-15redhat
redhatkernel-0:4.18.0-147.94.1.el8_12023-11-08redhat
redhatkernel-rt-0:4.18.0-305.108.1.rt7.183.el8_42023-10-17redhat
redhatkernel-0:4.18.0-305.108.1.el8_42023-10-10redhat
redhatkernel-0:4.18.0-477.27.1.el8_82023-09-19redhat
redhatkernel-rt-0:4.18.0-477.27.1.rt7.290.el8_82023-09-19redhat
redhatkernel-rt-0:5.14.0-284.30.1.rt14.315.el9_22023-09-12redhat
redhatkernel-0:5.14.0-284.30.1.el9_22023-09-12redhat

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

(18)

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 10× 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 106 total refreshes for this CVE.

  1. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-21 15:23 UTCEPSS rescore
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  1. 2026-07-06 16:26 UTCEPSS rescore
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  14. 2026-06-27 15:04 UTCOSV refresh
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  48. 2026-06-10 01:47 UTCOSV refresh
  49. 2026-06-08 14:16 UTCEPSS rescore
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  51. 2026-06-07 15:23 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-3776?
CVE-2023-3776 is a high vulnerability published on July 21, 2023. A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcfchangeindev() fails, fwsetparms() will immediately return an error after incrementing or decrementing the reference counter in tcfbindfilter(). If an…
When was CVE-2023-3776 disclosed?
CVE-2023-3776 was first published in the National Vulnerability Database on July 21, 2023, with the most recent update on February 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-3776 actively exploited?
CVE-2023-3776 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-3776?
CVE-2023-3776 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-3776?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-3776, 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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