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Fencer Intel
high 7.8

CVE-2021-4028 json

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a s…

published 4y ago modified 4mo ago also EUVD-2021-33929

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

Patch / fix

  • linux linux_kernel 5.10.71, 5.14.10
  • linux Debian 14, Debian 13, Debian 12 5.14.12-1

debian advisories DEBIAN-CVE-2021-4028

  • linux-aws-5.11 Ubuntu 20.04 LTS 5.11.0-1023.24~20.04.1
  • linux-gcp-5.11 Ubuntu 20.04 LTS 5.11.0-1024.26~20.04.1
  • linux-hwe-5.13 Ubuntu 20.04 LTS 5.13.0-23.23~20.04.2
  • linux-oem-5.10 Ubuntu 20.04 LTS 5.10.0-1051.53
  • linux-oem-5.13 Ubuntu 20.04 LTS 5.13.0-1026.32
  • linux-oem-5.14 Ubuntu 20.04 LTS 5.14.0-1007.7
  • linux-azure-5.11 Ubuntu 20.04 LTS 5.11.0-1023.24~20.04.1
  • linux-riscv-5.11 Ubuntu 20.04 LTS 5.11.0-1024.25~20.04.1

ubuntu advisories UBUNTU-CVE-2021-4028

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • redhat-virtualization-host rhev hypervisor 4.4 4.5.0-202205291010_8.6
  • redhat-virtualization-host-image-update rhev hypervisor 4.4 4.5.0-202205291010_8.6
  • redhat-virtualization-host RHEL 7 4.3.22-20220330.1.el7_9
  • redhat-virtualization-host-image-update RHEL 7 4.3.22-20220330.1.el7_9
  • kpatch-patch-4_18_0-348 RHEL 8 1-4.el8
  • kpatch-patch-4_18_0-348_2_1 RHEL 8 1-3.el8_5
  • kpatch-patch-4_18_0-348_7_1 RHEL 8 1-3.el8_5
  • kpatch-patch-4_18_0-348_12_2 RHEL 8 1-2.el8_5

red hat advisories RHSA-2022:4896RHSA-2022:1263RHSA-2022:0777RHSA-2022:1535RHSA-2022:1550RHSA-2022:1373

  • kernel-livepatch-SLE15-SP3_Update_1 SLE Live Patching 15 SP3 8-150300.2.2
  • kernel-livepatch-SLE15-SP3_Update_3 SLE Live Patching 15 SP3 8-150300.2.2
  • kernel-livepatch-SLE15-SP3_Update_0 SLE Live Patching 15 SP3 10-3.2
  • kernel-livepatch-SLE15-SP3_Update_6 SLE Live Patching 15 SP3 4-150300.2.2
  • kernel-livepatch-SLE15-SP3_Update_7 SLE Live Patching 15 SP3 4-150300.2.2
  • kernel-livepatch-SLE15-SP3_Update_2 SLE Live Patching 15 SP3 8-150300.2.2
  • kernel-livepatch-SLE15-SP3_Update_4 SLE Live Patching 15 SP3 7-150300.2.2
  • kernel-livepatch-SLE15-SP3_Update_5 SLE Live Patching 15 SP3 6-150300.2.2

suse advisories SUSE-SU-2022:0295-1SUSE-SU-2022:0293-1SUSE-SU-2022:0270-1SUSE-SU-2022:0257-1

  • kernel-rt Rocky Linux 8 4.18.0-348.23.1.rt7.153.el8_5
  • kernel Rocky Linux 8 4.18.0-348.23.1.el8_5

rocky linux advisories RLSA-2022:1555RLSA-2022:1550

  • linux-lts Arch Linux 5.15.2-1

arch linux advisories AVG-1741

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-4028 updated cvss 7.0

kernel: use-after-free in RDMA listen()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-348.23.1.el8_5, kernel-debuginfo-common-aarch64 4.18.0-348.23.1.el8_5, kernel-debuginfo-common-ppc64le 4.18.0-348.23.1.el8_5
    fixed: vendor fix RHSA-2022:1550
  • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-debuginfo-common-x86_64 4.18.0-193.75.1.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.75.1.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.75.1.el8_2
    fixed: vendor fix RHSA-2022:0636
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-348.23.1.el8_5, kernel 4.18.0-348.23.1.el8_5, bpftool 4.18.0-348.23.1.el8_5, kpatch-patch-4_18_0-348 1-4.el8, kernel-core 4.18.0-348.23.1.el8_5, kernel-tools 4.18.0-348.23.1.el8_5, +20 more
    fixed: vendor fix RHSA-2022:1550
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) perf 4.18.0-147.64.1.el8_1, kernel 4.18.0-147.64.1.el8_1, bpftool 4.18.0-147.64.1.el8_1, kernel-core 4.18.0-147.64.1.el8_1, kernel-tools 4.18.0-147.64.1.el8_1, python3-perf 4.18.0-147.64.1.el8_1, +19 more
    fixed: vendor fix RHSA-2022:0823
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) perf 4.18.0-193.75.1.el8_2, kernel 4.18.0-193.75.1.el8_2, bpftool 4.18.0-193.75.1.el8_2, kernel-core 4.18.0-193.75.1.el8_2, kernel-tools 4.18.0-193.75.1.el8_2, python3-perf 4.18.0-193.75.1.el8_2, +25 more
    fixed: vendor fix RHSA-2022:0636
  • Red Hat Enterprise Linux BaseOS EUS (v.8.4) perf 4.18.0-305.40.1.el8_4, kernel 4.18.0-305.40.1.el8_4, bpftool 4.18.0-305.40.1.el8_4, kpatch-patch-4_18_0-305 1-11.el8, kernel-core 4.18.0-305.40.1.el8_4, kernel-tools 4.18.0-305.40.1.el8_4, +26 more
    fixed: vendor fix RHSA-2022:0777
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.62.1.el7, kernel 3.10.0-1160.62.1.el7, bpftool 3.10.0-1160.62.1.el7, python-perf 3.10.0-1160.62.1.el7, kernel-tools 3.10.0-1160.62.1.el7, kernel-tools-libs 3.10.0-1160.62.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.62.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.62.1.el7
    fixed: vendor fix RHSA-2022:1198
show 29 more
  • Red Hat Enterprise Linux CRB EUS (v.8.4) kernel-debuginfo-common-x86_64 4.18.0-305.40.1.el8_4, kernel-debuginfo-common-aarch64 4.18.0-305.40.1.el8_4, kernel-debuginfo-common-ppc64le 4.18.0-305.40.1.el8_4
    fixed: vendor fix RHSA-2022:0777
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-trace 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.62.1.rt56.1203.el7
    fixed: vendor fix RHSA-2022:1199
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-core 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-modules 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-debug-core 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-debug-modules 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-modules-extra 4.18.0-348.23.1.rt7.153.el8_5, +2 more
    fixed: vendor fix RHSA-2022:1555
  • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-kvm 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-trace 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debug-kvm 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-trace-kvm 3.10.0-1160.62.1.rt56.1203.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.62.1.rt56.1203.el7
    fixed: vendor fix RHSA-2022:1199
  • Red Hat Enterprise Linux NFV EUS (v.8.4) kernel-rt 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-kvm 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-core 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-modules 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-debug-kvm 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-debug-core 4.18.0-305.40.1.rt7.112.el8_4, +4 more
    fixed: vendor fix RHSA-2022:0771
  • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-core 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-modules 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-debug-core 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-debug-modules 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-modules-extra 4.18.0-193.75.1.rt13.125.el8_2, +2 more
    fixed: vendor fix RHSA-2022:0629
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-kvm 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-core 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-modules 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-debug-kvm 4.18.0-348.23.1.rt7.153.el8_5, kernel-rt-debug-core 4.18.0-348.23.1.rt7.153.el8_5, +4 more
    fixed: vendor fix RHSA-2022:1555
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-kvm 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-core 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-modules 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-debug-kvm 4.18.0-193.75.1.rt13.125.el8_2, kernel-rt-debug-core 4.18.0-193.75.1.rt13.125.el8_2, +4 more
    fixed: vendor fix RHSA-2022:0629
  • Red Hat Enterprise Linux RT EUS (v.8.4) kernel-rt 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-core 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-modules 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-debug-core 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-debug-modules 4.18.0-305.40.1.rt7.112.el8_4, kernel-rt-modules-extra 4.18.0-305.40.1.rt7.112.el8_4, +2 more
    fixed: vendor fix RHSA-2022:0771
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.62.1.el7, kernel 3.10.0-1160.62.1.el7, bpftool 3.10.0-1160.62.1.el7, python-perf 3.10.0-1160.62.1.el7, kernel-kdump 3.10.0-1160.62.1.el7, kernel-tools 3.10.0-1160.62.1.el7, +17 more
    fixed: vendor fix RHSA-2022:1198
  • Red Hat Enterprise Linux Server AUS (v. 7.3) perf 3.10.0-514.101.1.el7, kernel 3.10.0-514.101.1.el7, python-perf 3.10.0-514.101.1.el7, kernel-tools 3.10.0-514.101.1.el7, kernel-tools-libs 3.10.0-514.101.1.el7, kernel-abi-whitelists 3.10.0-514.101.1.el7, +1 more
    fixed: vendor fix RHSA-2022:2189
  • Red Hat Enterprise Linux Server AUS (v. 7.4) perf 3.10.0-693.100.1.el7, kernel 3.10.0-693.100.1.el7, python-perf 3.10.0-693.100.1.el7, kernel-tools 3.10.0-693.100.1.el7, kernel-tools-libs 3.10.0-693.100.1.el7, kernel-abi-whitelists 3.10.0-693.100.1.el7, +1 more
    fixed: vendor fix RHSA-2022:2188
  • Red Hat Enterprise Linux Server AUS (v. 7.6) perf 3.10.0-957.94.1.el7, kernel 3.10.0-957.94.1.el7, bpftool 3.10.0-957.94.1.el7, python-perf 3.10.0-957.94.1.el7, kernel-tools 3.10.0-957.94.1.el7, kernel-tools-libs 3.10.0-957.94.1.el7, +2 more
    fixed: vendor fix RHSA-2022:2186
  • Red Hat Enterprise Linux Server AUS (v. 7.7) perf 3.10.0-1062.66.1.el7, kernel 3.10.0-1062.66.1.el7, bpftool 3.10.0-1062.66.1.el7, python-perf 3.10.0-1062.66.1.el7, kernel-tools 3.10.0-1062.66.1.el7, kernel-tools-libs 3.10.0-1062.66.1.el7, +2 more
    fixed: vendor fix RHSA-2022:1324
  • Red Hat Enterprise Linux Server E4S (v. 7.6) perf 3.10.0-957.94.1.el7, kernel 3.10.0-957.94.1.el7, python-perf 3.10.0-957.94.1.el7, kernel-tools 3.10.0-957.94.1.el7, kpatch-patch-3_10_0-957_72_1 1-7.el7, kpatch-patch-3_10_0-957_76_1 1-7.el7, +11 more
    fixed: vendor fix RHSA-2022:2186
  • Red Hat Enterprise Linux Server E4S (v. 7.7) perf 3.10.0-1062.66.1.el7, kernel 3.10.0-1062.66.1.el7, bpftool 3.10.0-1062.66.1.el7, python-perf 3.10.0-1062.66.1.el7, kernel-tools 3.10.0-1062.66.1.el7, kpatch-patch-3_10_0-1062_49_1 1-6.el7, +12 more
    fixed: vendor fix RHSA-2022:1324
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.62.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.62.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.62.1.el7
    fixed: vendor fix RHSA-2022:1198
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.101.1.el7
    fixed: vendor fix RHSA-2022:2189
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.100.1.el7
    fixed: vendor fix RHSA-2022:2188
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.94.1.el7
    fixed: vendor fix RHSA-2022:2186
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.66.1.el7
    fixed: vendor fix RHSA-2022:1324
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.94.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.94.1.el7
    fixed: vendor fix RHSA-2022:2186
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.66.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.66.1.el7
    fixed: vendor fix RHSA-2022:1324
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.94.1.el7
    fixed: vendor fix RHSA-2022:2186
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.66.1.el7
    fixed: vendor fix RHSA-2022:1324
  • Red Hat Enterprise Linux Server TUS (v. 7.6) perf 3.10.0-957.94.1.el7, kernel 3.10.0-957.94.1.el7, bpftool 3.10.0-957.94.1.el7, python-perf 3.10.0-957.94.1.el7, kernel-tools 3.10.0-957.94.1.el7, kernel-tools-libs 3.10.0-957.94.1.el7, +2 more
    fixed: vendor fix RHSA-2022:2186
  • Red Hat Enterprise Linux Server TUS (v. 7.7) perf 3.10.0-1062.66.1.el7, kernel 3.10.0-1062.66.1.el7, bpftool 3.10.0-1062.66.1.el7, python-perf 3.10.0-1062.66.1.el7, kernel-tools 3.10.0-1062.66.1.el7, kernel-tools-libs 3.10.0-1062.66.1.el7, +2 more
    fixed: vendor fix RHSA-2022:1324
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.62.1.el7, kernel 3.10.0-1160.62.1.el7, bpftool 3.10.0-1160.62.1.el7, python-perf 3.10.0-1160.62.1.el7, kernel-tools 3.10.0-1160.62.1.el7, kernel-tools-libs 3.10.0-1160.62.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.62.1.el7
    fixed: vendor fix RHSA-2022:1198
  • Red Hat Virtualization 4 Hypervisor for RHEL 7 redhat-virtualization-host 4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update 4.3.22-20220330.1.el7_9
    fixed: vendor fix RHSA-2022:1263

2 more fixed, 4 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • n/a kernel

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.