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CVE-2026-100071

MEDIUM 5.5

Published 2026-09-25 · Last modified 2026-10-19

In the Linux kernel, the following vulnerability has been resolved: net: hsr: free learned nodes on device setup failure hsr_dev_finalize() can fail after a lower-device RX handler has already been registered (slave A is added before the failable slave B and interlink adds). RX handlers run in softirq regardless of the master's state, so frames received in that window can learn dynamic nodes into node_db, and the error unwind never releases them. Free both owned dynamic databases in the unwind, mirroring hsr_dellink(). proxy_node_db is provably empty on every current error exit (only interlink RX feeds it, and the interlink add is the last failable step) and is freed for symmetry. The order is safe: hsr_del_port() unregisters each RX handler with synchronize_net() before hsr_del_nodes() runs, which removes remaining entries with list_del_rcu() and defers their release with call_rcu() for readers already under RCU.

NO EXPLOITATION SIGNALS

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

Exploitation likelihood

0.1%chance of exploitation in 30 days · 1st percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

5.5CVSS 3.1 · MEDIUM

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Linux

Products Linux Linux Kernel

Weakness (CWE)

Not classified.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References and research data (JSON)

Vendor product assessments

Showing 32 of 278 vendor product statements; 246 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-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-64k-modules as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-devel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-64k-debug-core as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+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-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-uki-virt as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-uki-virt

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • python3-perf as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python3-perf

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+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-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-cross-headers as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-cross-headers

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-devel-matched as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-devel-matched

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-64k-core as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-64k-devel-matched as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-debug-modules as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-modules-partner as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

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

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-zfcpdump-modules as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/kernel-zfcpdump-modules

    • none available: Fix deferred
    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+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-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-doc as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-doc

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • perf as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/perf

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+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-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-kdump-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-kdump-devel

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+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-2026-100071 · Updated 2026-10-21T20:17:49+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-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • bpftool as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bpftool

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-debug as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-debug

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-devel as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-devel

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-modules-internal as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-modules-internal

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-debug-kvm as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

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

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-rt-modules as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-rt-modules

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-tools as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-tools

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • kernel-zfcpdump-modules as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/kernel-zfcpdump-modules

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00
  • openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/ose-rhel-coreos-8?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-8

    Red Hat · CVE-2026-100071 · Updated 2026-10-21T20:17:49+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxLinux Kernel≥ 3.17 and < 6.1.188
LinuxLinux Kernel≥ 6.2 and < 6.6.157
LinuxLinux Kernel≥ 6.7 and < 6.12.110
LinuxLinux Kernel≥ 6.13 and < 6.18.52
LinuxLinux Kernel≥ 6.19 and < 7.2.6

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS