CVE-2020-12657

HIGHNVD 7.87.8—

7.8

An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 12.5%
KEV: Not listed

Published

May 5, 2020

Last Modified

November 21, 2024

References (20)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
cve@mitrehttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
cve@mitrehttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
cve@mitrehttps://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
cve@mitrehttps://patchwork.kernel.org/patch/11447049/
cve@mitrehttps://security.netapp.com/advisory/ntap-20200608-0001/
cve@mitrehttps://usn.ubuntu.com/4363-1/
cve@mitrehttps://usn.ubuntu.com/4367-1/
cve@mitrehttps://usn.ubuntu.com/4368-1/
cve@mitrehttps://usn.ubuntu.com/4369-1/
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
af854a3a-2127-422b-91ae-364da2661108https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
af854a3a-2127-422b-91ae-364da2661108https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9
af854a3a-2127-422b-91ae-364da2661108https://patchwork.kernel.org/patch/11447049/

Patch Availability(9)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-virtual (5.3.0.53.45) @ eoan	2026-05-27	ubuntu
ubuntu	linux-image-virtual-hwe-20.04 (5.4.0.31.36) @ focal	2026-05-27	ubuntu
ubuntu	linux-image-oem-osp1 (5.0.0.1052.55) @ bionic	2026-05-27	ubuntu
ubuntu	linux-image-virtual-hwe-16.04-edge (4.15.0.101.108) @ xenial	2026-05-27	ubuntu
redhat	kpatch-patch	2020-06-23	redhat
redhat	kernel-0:4.18.0-147.20.1.el8_1	2020-06-23	redhat
redhat	kernel-0:4.18.0-80.23.2.el8_0	2020-06-09	redhat
redhat	kernel-rt-0:4.18.0-193.6.3.rt13.59.el8_2	2020-06-09	redhat
redhat	kernel-0:4.18.0-193.6.3.el8_2	2020-06-09	redhat

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.

CWE-416Use After Free

All Vendor Advisories

(11)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× 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.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-12657?

CVE-2020-12657 is a high vulnerability published on May 5, 2020. An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfqidleslicetimerbody.

When was CVE-2020-12657 disclosed?

CVE-2020-12657 was first published in the National Vulnerability Database on May 5, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-12657 actively exploited?

CVE-2020-12657 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-12657?

CVE-2020-12657 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2020-12657?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12657, 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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