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Fencer Vulns
high 7.8

CVE-2022-49377 json

blk-mq: don't touch ->tagset in blk_mq_get_sq_hctx

published 2025-02-26 20 mo ago modified 2026-08-05 3 mo ago also EUVD-2022-54852

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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

blk-mq: don't touch ->tagset in blk_mq_get_sq_hctx

blk_mq_run_hw_queues() could be run when there isn't queued request and after queue is cleaned up, at that time tagset is freed, because tagset lifetime is covered by driver, and often freed after blk_cleanup_queue() returns.

So don't touch ->tagset for figuring out current default hctx by the mapping built in request queue, so use-after-free on tagset can be avoided. Meantime this way should be fast than retrieving mapping from tagset.

Patch / fix

  • Linux Linux 5.15.47, 5.17.15, 5.18.4, 5.19
  • linux Debian 14, Debian 13, Debian 12 5.18.5-1

debian advisories DEBIAN-CVE-2022-49377

  • linux Ubuntu 22.04 LTS 5.15.0-48.54
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1020.24
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1018.24
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1016.19
  • linux-ibm Ubuntu 22.04 LTS 5.15.0-1015.17
  • linux-kvm Ubuntu 22.04 LTS 5.15.0-1018.22
  • linux-azure Ubuntu 22.04 LTS 5.15.0-1020.25
  • linux-gkeop Ubuntu 22.04 LTS 5.15.0-1003.5

ubuntu advisories UBUNTU-CVE-2022-49377

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

  • kernel-rt RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-kvm RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-core RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-modules RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-debug-kvm RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-debug-core RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-debug-modules RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0
  • kernel-rt-modules-extra RHEL 9.0 E4S 5.14.0-70.136.1.rt21.208.el9_0

red hat advisories RHSA-2025:10193RHSA-2025:10174

  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.100.1
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.100.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.100.1
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.100.1
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.100.1
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.100.1.150500.6.47.1
  • kernel-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.115.1
  • kernel-source-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.115.1

suse advisories SUSE-SU-2025:1241-1SUSE-SU-2025:1183-1SUSE-SU-2025:1176-1SUSE-SU-2025:1027-1

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-2022-49377 updated cvss 7.8

kernel: blk-mq: don't touch ->tagset in blk_mq_get_sq_hctx

  • 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
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    affected: no fix available
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.136.1.el9_0, kernel-devel-matched 5.14.0-70.136.1.el9_0, kernel-debug-devel-matched 5.14.0-70.136.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.136.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.136.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.136.1.el9_0, +2 more Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.136.1.el9_0, bpftool 5.14.0-70.136.1.el9_0, kernel-core 5.14.0-70.136.1.el9_0, kernel-tools 5.14.0-70.136.1.el9_0, python3-perf 5.14.0-70.136.1.el9_0, kernel-modules 5.14.0-70.136.1.el9_0, +14 more
    fixed: vendor fix RHSA-2025:10174
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-kvm 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-core 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-modules 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-kvm 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-core 5.14.0-70.136.1.rt21.208.el9_0, +4 more Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-core 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-modules 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-core 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-debug-modules 5.14.0-70.136.1.rt21.208.el9_0, kernel-rt-modules-extra 5.14.0-70.136.1.rt21.208.el9_0, +2 more
    fixed: vendor fix RHSA-2025:10193
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 10 kernel
    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
total
Assessed
20 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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