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Fencer Vulns
high 7.8

CVE-2021-47596 json

net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg

published 2024-06-19 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34598

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg

Currently, the hns3_remove function firstly uninstall client instance, and then uninstall acceletion engine device. The netdevice is freed in client instance uninstall process, but acceletion engine device uninstall process still use it to trace runtime information. This causes a use after free problem.

So fixes it by check the instance register state to avoid use after free.

Patch / fix

  • Linux Linux 5.10.88, 5.15.11, 5.16
  • linux Debian 14, Debian 13, Debian 12 5.15.15-1

debian advisories DEBIAN-CVE-2021-47596

  • kernel RHEL 9 5.14.0-427.26.1.el9_4
  • rv RHEL 9 5.14.0-427.26.1.el9_4
  • perf RHEL 9 5.14.0-427.26.1.el9_4
  • rtla RHEL 9 5.14.0-427.26.1.el9_4
  • bpftool RHEL 9 7.3.0-427.26.1.el9_4
  • libperf RHEL 9 5.14.0-427.26.1.el9_4
  • kernel-rt RHEL 9 5.14.0-427.26.1.el9_4
  • kernel-64k RHEL 9 5.14.0-427.26.1.el9_4

red hat advisories RHSA-2024:4583RHSA-2024:4554RHSA-2024:4533

  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.73.1
  • kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.73.1
  • kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.73.1
  • kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.73.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.73.1
  • kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +5 more 5.14.21-150500.55.73.1
  • kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.73.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.73.1

suse advisories SUSE-SU-2024:2939-1SUSE-SU-2024:2929-1SUSE-SU-2024:2902-1SUSE-SU-2024:2394-1SUSE-SU-2024:2384-1SUSE-SU-2024:2372-1

  • kernel AlmaLinux 9 5.14.0-427.26.1.el9_4
  • rv AlmaLinux 9 5.14.0-427.26.1.el9_4
  • perf AlmaLinux 9 5.14.0-427.26.1.el9_4
  • rtla AlmaLinux 9 5.14.0-427.26.1.el9_4
  • bpftool AlmaLinux 9 7.3.0-427.26.1.el9_4
  • libperf AlmaLinux 9 5.14.0-427.26.1.el9_4
  • kernel-rt AlmaLinux 9 5.14.0-427.26.1.el9_4
  • kernel-64k AlmaLinux 9 5.14.0-427.26.1.el9_4

almalinux advisories ALSA-2024:4583

  • kernel Rocky Linux 9 5.14.0-427.26.1.el9_4

rocky linux advisories RLSA-2024:4583

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-2021-47596 updated cvss 7.3

kernel: net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg

  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.73.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.73.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.73.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.73.1.el9_2
    fixed: vendor fix RHSA-2024:4533
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.26.1.el9_4, perf 5.14.0-427.26.1.el9_4, rtla 5.14.0-427.26.1.el9_4, kernel-devel-matched 5.14.0-427.26.1.el9_4, kernel-64k-devel-matched 5.14.0-427.26.1.el9_4, kernel-debug-devel-matched 5.14.0-427.26.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:4583
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.73.1.el9_2, rtla 5.14.0-284.73.1.el9_2, kernel-devel-matched 5.14.0-284.73.1.el9_2, kernel-64k-devel-matched 5.14.0-284.73.1.el9_2, kernel-debug-devel-matched 5.14.0-284.73.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.73.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:4533
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.26.1.el9_4, kernel 5.14.0-427.26.1.el9_4, kernel-64k 5.14.0-427.26.1.el9_4, kernel-core 5.14.0-427.26.1.el9_4, kernel-tools 5.14.0-427.26.1.el9_4, python3-perf 5.14.0-427.26.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:4583
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.73.1.el9_2, kernel 5.14.0-284.73.1.el9_2, kernel-64k 5.14.0-284.73.1.el9_2, kernel-core 5.14.0-284.73.1.el9_2, kernel-tools 5.14.0-284.73.1.el9_2, python3-perf 5.14.0-284.73.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:4533
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.26.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.26.1.el9_4 Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.26.1.el9_4, kernel-rt-kvm 5.14.0-427.26.1.el9_4, kernel-rt-core 5.14.0-427.26.1.el9_4, kernel-rt-modules 5.14.0-427.26.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.26.1.el9_4, kernel-rt-debug-core 5.14.0-427.26.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:4583
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-core 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-modules 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-debug-core 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-modules-core 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-debug-modules 5.14.0-284.73.1.rt14.358.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-kvm 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-core 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-modules 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-debug-kvm 5.14.0-284.73.1.rt14.358.el9_2, kernel-rt-debug-core 5.14.0-284.73.1.rt14.358.el9_2, +6 more
    fixed: vendor fix RHSA-2024:4554
show 2 more
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.26.1.el9_4, kernel-rt-core 5.14.0-427.26.1.el9_4, kernel-rt-modules 5.14.0-427.26.1.el9_4, kernel-rt-debug-core 5.14.0-427.26.1.el9_4, kernel-rt-modules-core 5.14.0-427.26.1.el9_4, kernel-rt-debug-modules 5.14.0-427.26.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:4583
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.73.1.el9_2
    not affected: vulnerable code not present

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns 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.