Read the docs
TI-2020-16905 Aliases CVE-2020-27835GHSA-8pf6-658f-7qh2

Use after free in kernel

Priority LOW 20CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 4 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A use after free in the Linux kernel infiniband hfi1 driver in versions prior to 5.10-rc6 was found in the way user calls Ioctl after open dev file and fork. A local user could use this flaw to crash the system.

Why it matters now

EPSS 0.00312 24th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 4 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—kernelkernel versions prior to 5.10-rc6—No fix listedCNA
  • kernel Vendor— Affected kernel versions prior to 5.10-rc6 Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:linux:infiniband_hfi1_driver:*:*:*:*:*:*:*:*up to 5.9VulnerableLinux
cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc1:*:*:*:*:*:*5.10 rc1VulnerableLinux
cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc2:*:*:*:*:*:*5.10 rc2VulnerableLinux
cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc3:*:*:*:*:*:*5.10 rc3VulnerableLinux
cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc4:*:*:*:*:*:*5.10 rc4VulnerableLinux
cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc5:*:*:*:*:*:*5.10 rc5VulnerableLinux
  • cpe:2.3:a:linux:infiniband_hfi1_driver:*:*:*:*:*:*:*:* Versions up to 5.9 Vulnerable ·Linux
  • cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc1:*:*:*:*:*:* Versions 5.10 rc1 Vulnerable ·Linux
  • cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc2:*:*:*:*:*:* Versions 5.10 rc2 Vulnerable ·Linux
  • cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc3:*:*:*:*:*:* Versions 5.10 rc3 Vulnerable ·Linux
  • cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc4:*:*:*:*:*:* Versions 5.10 rc4 Vulnerable ·Linux
  • cpe:2.3:a:linux:infiniband_hfi1_driver:5.10:rc5:*:*:*:*:*:* Versions 5.10 rc5 Vulnerable ·Linux

Remediation

Red Hat 2 advisories

  • RHSA-2021:1739 Released 2021-05-18 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-305.rt7.72.el8, kernel-rt-core-4.18.0-305.rt7.72.el8, kernel-rt-debug-4.18.0-305.rt7.72.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-305.rt7.72.el8, kernel-rt-core-4.18.0-305.rt7.72.el8, kernel-rt-debug-4.18.0-305.rt7.72.el8 +9
  • RHSA-2021:1578 Released 2021-05-18 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-305.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-305.el8, kernel-4.18.0-305.el8, kernel-abi-stablelists-4.18.0-305.el8 +19

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1578
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:1578
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:1739
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:1739
Not affected: 2 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27835
  2. 2026-10-03 Alias added: GHSA-8pf6-658f-7qh2

References

Patch 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences