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MEDIUM

CVE-2020-15436

CVSS v3

6.7

MEDIUM

EPSS Score

0.9 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2020-15436 Red Hat Product Security441 products fixed · 26 known affected

    kernel: use-after-free in fs/block_dev.c

    kernel as a component of Red Hat Enterprise Linux 6 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6 · kernel-bootwrapper as a component of Red Hat Enterprise Linux 6

  • ICSA-24-074-07 CISA1 known affected

    Siemens SIMATIC

    Siemens SIMATIC RF160B (6GT2003-0FA00): <V2.2

  • SSA-770721 Siemens ProductCERT1 known affected

    SSA-770721: Multiple Vulnerabilities in SIMATIC RF160B before V2.2

    SIMATIC RF160B (6GT2003-0FA00)

  • RHSA-2021:2523 Red Hat Product Security120 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2021:1376 Red Hat Product Security111 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2021:0336 Red Hat Product Security155 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

2 more advisories

Full record on NVD

Description

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

Technical details

Published
2020-11-23

Frequently asked questions

What is CVE-2020-15436?

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

Is CVE-2020-15436 actively exploited?

Active exploitation of CVE-2020-15436 has not been confirmed. Its EPSS score was 0.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-15436?

CVE-2020-15436 has a CVSS v3 base score of 6.7 (MEDIUM severity).

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