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Fencer Vulns
medium 4.7

CVE-2026-23110 json

scsi: core: Wake up the error handler when final completions race against each other

published 2026-02-04 9 mo ago modified 2026-10-19 20 d ago also EUVD-2026-5431

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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

scsi: core: Wake up the error handler when final completions race against each other

The fragile ordering between marking commands completed or failed so that the error handler only wakes when the last running command completes or times out has race conditions. These race conditions can cause the SCSI layer to fail to wake the error handler, leaving I/O through the SCSI host stuck as the error state cannot advance.

First, there is an memory ordering issue within scsi_dec_host_busy(). The write which clears SCMD_STATE_INFLIGHT may be reordered with reads counting in scsi_host_busy(). While the local CPU will see its own write, reordering can allow other CPUs in scsi_dec_host_busy() or scsi_eh_inc_host_failed() to see a raised busy count, causing no CPU to see a host busy equal to the host_failed count.

This race condition can be prevented with a memory barrier on the error path to force the write to be visible before counting host busy commands.

Second, there is a general ordering issue with scsi_eh_inc_host_failed(). By counting busy commands before incrementing host_failed, it can race with a final command in scsi_dec_host_busy(), such that scsi_dec_host_busy() does not see host_failed incremented but scsi_eh_inc_host_failed() counts busy commands before SCMD_STATE_INFLIGHT is cleared by scsi_dec_host_busy(), resulting in neither waking the error handler task.

This needs the call to scsi_host_busy() to be moved after host_failed is incremented to close the race condition.

Patch / fix

  • Linux Linux 5.10.249, 6.1.162, 6.6.122, 6.12.68, 6.18.8, 6.19
  • linux Debian 12 6.1.162-1
  • linux Debian 13 6.12.69-1
  • linux Debian 14 6.18.8-1

debian advisories DEBIAN-CVE-2026-23110

  • linux Ubuntu 24.04 LTS 6.8.0-117.117
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1055.58
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1058.61
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1054.60
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1055.56
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1056.62
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1041.44
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1056.60

ubuntu advisories UBUNTU-CVE-2026-23110

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 RHEL 10.2 6.12.0-211.39.1.el10_2
  • rv RHEL 10.2 6.12.0-211.39.1.el10_2
  • perf RHEL 10.2 6.12.0-211.39.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.39.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.39.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.39.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.39.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.39.1.el10_2

red hat advisories RHSA-2026:56574RHSA-2026:55445RHSA-2026:45114RHSA-2026:43307

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.34.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.34.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.34.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.34.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.34.1.150700.17.23.1

suse advisories SUSE-SU-2026:1081-1SUSE-SU-2026:20873-1SUSE-SU-2026:20838-1SUSE-SU-2026:20931-1SUSE-SU-2026:20845-1SUSE-SU-2026:20876-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.27.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.27.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.27.1

opensuse advisories openSUSE-SU-2026:20416-1

  • kernel AlmaLinux 10 6.12.0-211.39.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.39.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.39.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.39.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.39.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.39.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.39.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.39.1.el10_2

almalinux advisories ALSA-2026:45114ALSA-2026:43307

  • kernel Rocky Linux 10 6.12.0-211.39.1.el10_2
  • kernel Rocky Linux 9 5.14.0-687.29.1.el9_8

rocky linux advisories RLSA-2026:45114RLSA-2026:43307

  • kernel Azure Linux 3.0 6.6.126.1-1

azure linux advisories AZL-77118

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-23110 updated cvss 5.5

kernel: scsi: core: Wake up the error handler when final completions race against each other

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: no fix available “Fix deferred”
  • 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: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.135.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.135.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.135.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.135.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.135.1.el9_6
    fixed: vendor fix RHSA-2026:56574
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.29.1.el9_8, perf 5.14.0-687.29.1.el9_8, rtla 5.14.0-687.29.1.el9_8, python3-perf 5.14.0-687.29.1.el9_8, kernel-devel-matched 5.14.0-687.29.1.el9_8, kernel-64k-devel-matched 5.14.0-687.29.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:43307
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.39.1.el10_2, perf 6.12.0-211.39.1.el10_2, rtla 6.12.0-211.39.1.el10_2, python3-perf 6.12.0-211.39.1.el10_2, kernel-devel-matched 6.12.0-211.39.1.el10_2, kernel-64k-devel-matched 6.12.0-211.39.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.98.1.el10_0, perf 6.12.0-55.98.1.el10_0, rtla 6.12.0-55.98.1.el10_0, python3-perf 6.12.0-55.98.1.el10_0, kernel-devel-matched 6.12.0-55.98.1.el10_0, kernel-64k-devel-matched 6.12.0-55.98.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.135.1.el9_6, perf 5.14.0-570.135.1.el9_6, rtla 5.14.0-570.135.1.el9_6, python3-perf 5.14.0-570.135.1.el9_6, kernel-devel-matched 5.14.0-570.135.1.el9_6, kernel-64k-devel-matched 5.14.0-570.135.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:56574
show 16 more
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.29.1.el9_8, kernel-64k 5.14.0-687.29.1.el9_8, kernel-core 5.14.0-687.29.1.el9_8, kernel-tools 5.14.0-687.29.1.el9_8, kernel-modules 5.14.0-687.29.1.el9_8, kernel-64k-core 5.14.0-687.29.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:43307
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.39.1.el10_2, kernel-64k 6.12.0-211.39.1.el10_2, kernel-core 6.12.0-211.39.1.el10_2, kernel-tools 6.12.0-211.39.1.el10_2, kernel-modules 6.12.0-211.39.1.el10_2, kernel-64k-core 6.12.0-211.39.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.98.1.el10_0, kernel-64k 6.12.0-55.98.1.el10_0, kernel-core 6.12.0-55.98.1.el10_0, kernel-tools 6.12.0-55.98.1.el10_0, kernel-modules 6.12.0-55.98.1.el10_0, kernel-64k-core 6.12.0-55.98.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.135.1.el9_6, kernel-64k 5.14.0-570.135.1.el9_6, kernel-core 5.14.0-570.135.1.el9_6, kernel-tools 5.14.0-570.135.1.el9_6, kernel-modules 5.14.0-570.135.1.el9_6, kernel-64k-core 5.14.0-570.135.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:56574
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.29.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.29.1.el9_8
    fixed: vendor fix RHSA-2026:43307
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.39.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.39.1.el10_2
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.98.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.98.1.el10_0
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.29.1.el9_8, kernel-rt-64k 5.14.0-687.29.1.el9_8, kernel-rt-core 5.14.0-687.29.1.el9_8, kernel-rt-modules 5.14.0-687.29.1.el9_8, kernel-rt-64k-core 5.14.0-687.29.1.el9_8, kernel-rt-debug-core 5.14.0-687.29.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:43307
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.39.1.el10_2, kernel-rt-64k 6.12.0-211.39.1.el10_2, kernel-rt-core 6.12.0-211.39.1.el10_2, kernel-rt-modules 6.12.0-211.39.1.el10_2, kernel-rt-64k-core 6.12.0-211.39.1.el10_2, kernel-rt-debug-core 6.12.0-211.39.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.98.1.el10_0, kernel-rt-64k 6.12.0-55.98.1.el10_0, kernel-rt-core 6.12.0-55.98.1.el10_0, kernel-rt-modules 6.12.0-55.98.1.el10_0, kernel-rt-64k-core 6.12.0-55.98.1.el10_0, kernel-rt-debug-core 6.12.0-55.98.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.135.1.el9_6, kernel-rt-64k 5.14.0-570.135.1.el9_6, kernel-rt-core 5.14.0-570.135.1.el9_6, kernel-rt-modules 5.14.0-570.135.1.el9_6, kernel-rt-64k-core 5.14.0-570.135.1.el9_6, kernel-rt-debug-core 5.14.0-570.135.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:56574
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.29.1.el9_8, kernel-rt-core 5.14.0-687.29.1.el9_8, kernel-rt-modules 5.14.0-687.29.1.el9_8, kernel-rt-debug-core 5.14.0-687.29.1.el9_8, kernel-rt-modules-core 5.14.0-687.29.1.el9_8, kernel-rt-debug-modules 5.14.0-687.29.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:43307
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.39.1.el10_2, kernel-rt-core 6.12.0-211.39.1.el10_2, kernel-rt-modules 6.12.0-211.39.1.el10_2, kernel-rt-debug-core 6.12.0-211.39.1.el10_2, kernel-rt-modules-core 6.12.0-211.39.1.el10_2, kernel-rt-debug-modules 6.12.0-211.39.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:45114
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.98.1.el10_0, kernel-rt-kvm 6.12.0-55.98.1.el10_0, kernel-rt-core 6.12.0-55.98.1.el10_0, kernel-rt-modules 6.12.0-55.98.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.98.1.el10_0, kernel-rt-debug-core 6.12.0-55.98.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:55445
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.135.1.el9_6, kernel-rt-kvm 5.14.0-570.135.1.el9_6, kernel-rt-core 5.14.0-570.135.1.el9_6, kernel-rt-modules 5.14.0-570.135.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.135.1.el9_6, kernel-rt-debug-core 5.14.0-570.135.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:56574
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    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 ICSA-26-295-11 updated cvss 5.5

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.7 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.7
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-26-209-04 updated cvss 5.5

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.6 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.6
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
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.