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TI-2020-06932 Aliases CVE-2020-8648GHSA-9hr4-45xh-6xvh

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the…

Priority LOW 32CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 25 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.

Why it matters now

EPSS 0.00661 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 6 advisoriesRed Hat: 25 fixed, 4 without a fix

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*up to 5.5.2VulnerableLinux
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:hci_baseboard_management_controller:h410c:*:*:*:*:*:*:*h410cVulnerableNetApp
cpe:2.3:a:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableBroadcom
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions up to 5.5.2 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:hci_baseboard_management_controller:h410c:*:*:*:*:*:*:* Versions h410c Vulnerable ·NetApp
  • cpe:2.3:a:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Broadcom
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical

Remediation

Red Hat 6 advisories

  • RHSA-2021:3522 Released 2021-09-14 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +9
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debug-devel-3.10.0-1062.56.1.el7, kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-tools-libs-devel-3.10.0-1062.56.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.7) bpftool-3.10.0-1062.56.1.el7, kernel-3.10.0-1062.56.1.el7, kernel-abi-whitelists-3.10.0-1062.56.1.el7 +8
  • RHSA-2021:3320 Released 2021-08-31 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 7.6) bpftool-3.10.0-957.80.1.el7, kernel-3.10.0-957.80.1.el7, kernel-abi-whitelists-3.10.0-957.80.1.el7 +8
    • Red Hat Enterprise Linux Server E4S (v. 7.6) kernel-3.10.0-957.80.1.el7, kernel-abi-whitelists-3.10.0-957.80.1.el7, kernel-bootwrapper-3.10.0-957.80.1.el7 +8
    • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.80.1.el7
    • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debug-devel-3.10.0-957.80.1.el7, kernel-tools-libs-devel-3.10.0-957.80.1.el7
    • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-tools-libs-devel-3.10.0-957.80.1.el7
    • Red Hat Enterprise Linux Server TUS (v. 7.6) bpftool-3.10.0-957.80.1.el7, kernel-3.10.0-957.80.1.el7, kernel-abi-whitelists-3.10.0-957.80.1.el7 +8
  • RHSA-2021:2314 Released 2021-06-08 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.31.1.el7, kernel-3.10.0-1160.31.1.el7, kernel-abi-whitelists-3.10.0-1160.31.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.31.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.31.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.31.1.el7, kernel-3.10.0-1160.31.1.el7, kernel-abi-whitelists-3.10.0-1160.31.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.31.1.el7, kernel-tools-libs-devel-3.10.0-1160.31.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.31.1.el7, kernel-3.10.0-1160.31.1.el7, kernel-abi-whitelists-3.10.0-1160.31.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.31.1.el7
Show 3 more Red Hat advisories
  • RHSA-2021:2316 Released 2021-06-08 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-devel-3.10.0-1160.31.1.rt56.1169.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-3.10.0-1160.31.1.rt56.1169.el7, kernel-rt-debug-devel-3.10.0-1160.31.1.rt56.1169.el7 +7
  • RHSA-2020:4609 Released 2020-11-04 · Red Hat rating Moderate
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-240.rt7.54.el8, kernel-rt-core-4.18.0-240.rt7.54.el8, kernel-rt-debug-4.18.0-240.rt7.54.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-240.rt7.54.el8, kernel-rt-core-4.18.0-240.rt7.54.el8, kernel-rt-debug-4.18.0-240.rt7.54.el8 +9
  • RHSA-2020:4431 Released 2020-11-04 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.el8, kernel-4.18.0-240.el8, kernel-abi-whitelists-4.18.0-240.el8 +19

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat Enterprise MRG 2AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2020:4431
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2020:4431
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2020:4609
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2020:4609
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Server AUS (v. 7.6)Fixed RHSA-2021:3320
Red Hat Enterprise Linux Server AUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server E4S (v. 7.6)Fixed RHSA-2021:3320
Red Hat Enterprise Linux Server E4S (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Server Optional AUS (v. 7.6)Fixed RHSA-2021:3320
Red Hat Enterprise Linux Server Optional AUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional E4S (v. 7.6)Fixed RHSA-2021:3320
Red Hat Enterprise Linux Server Optional E4S (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server Optional TUS (v. 7.6)Fixed RHSA-2021:3320
Red Hat Enterprise Linux Server Optional TUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Server TUS (v. 7.6)Fixed RHSA-2021:3320
Red Hat Enterprise Linux Server TUS (v. 7.7)Fixed RHSA-2021:3522
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2021:2314
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2021:2316
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2021:2316

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-8648
  2. 2026-10-03 Alias added: GHSA-9hr4-45xh-6xvh
  3. 2026-10-07 EPSS moved to the 50th–90th percentile

References

Exploit 1

Advisory 10

Sources

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