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CVE-2026-93795

N/A

Published 2026-09-24 · Last modified 2026-10-03

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix leaks and online flag on radix_tree_insert failure When radix_tree_insert() fails in blkg_create(), the error path has two issues: 1. blkg->online is set to true unconditionally, even when the blkg was never fully inserted. Move the assignment inside the success block. 2. The error path calls blkg_put() without first calling percpu_ref_kill(). Because the refcount is still in percpu mode, percpu_ref_put() only does this_cpu_sub() without checking for zero, so blkg_release() is never triggered. This permanently leaks the blkg memory, its percpu iostat, policy data, the parent blkg reference, and the cgroup css reference — the latter preventing the cgroup from ever being destroyed. Fix by replacing blkg_put() with percpu_ref_kill(), matching the pattern used in blkg_destroy().

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 7th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

—CVSS · not scored

  • No impact metrics

Proof of concept

No public PoC is currently catalogued.

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Data snapshot:

Affected

Vendors Linux

Products Linux

Weakness (CWE)

Not classified.

CVSS vector

Not yet scored.

References and research data (JSON)

Vendor product assessments

Showing 32 of 276 vendor product statements; 244 omitted. Read the full vendor advisory.

  • kernel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-core as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-core

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-64k as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-64k

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-debug-kvm

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-zfcpdump-devel-matched as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-zfcpdump-devel-matched

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-doc as a component of Red Hat Enterprise Linux 6 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-doc

    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-debug-modules as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-debug-modules as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-debug-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-zfcpdump-modules as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-zfcpdump-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-64k-debug-modules-extra as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-64k-debug-modules-extra

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-debug-modules as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-debug-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-modules-partner as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-modules-partner

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-64k-modules as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-64k-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-devel as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-rt-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-zfcpdump-core as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-zfcpdump-core

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known affected

    Vendor assessment for this product only.

    pkg:oci/ose-rhel-coreos-9?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9

    • none available: Fix deferred
    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • bpftool as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bpftool

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-abi-whitelists as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-abi-whitelists

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-debug as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-debug

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-debug-devel as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-debug-devel

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-doc as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-doc

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-kdump as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-kdump

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-debug-devel as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug-devel

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-debug-kvm

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-doc as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-doc

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-trace as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-trace

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-rt-trace-kvm as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-trace-kvm

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-tools as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-tools

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel-tools-libs as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-tools-libs

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • kernel.src as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel?arch=src

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00
  • python-perf as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/python-perf

    Red Hat · CVE-2026-93795 · Updated 2026-09-28T11:56:35+00:00

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS