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NVD / CVE Program· CNA Linux

CVE-2026-100071: net: hsr: free learned nodes on device setup failure

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0a340ffd96943a49a78e367efac9517ca767d99b, 49b01f2939abc676a6f9a118f07a10110ee5f683, 65702339b3e9fd792f65d4b740928798194d86ce; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0a340ffd96943a49a78e367efac9517ca767d99b, 49b01f2939abc676a6f9a118f07a10110ee5f683, 65702339b3e9fd792f65d4b740928798194d86ce; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 21, 2026
EPSS
0.1% · 1th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel3.17 and later · before 6.1.188
  • linux linux kernel6.2 and later · before 6.6.157
  • linux linux kernel6.7 and later · before 6.12.110
  • linux linux kernel6.13 and later · before 6.18.52
  • linux linux kernel6.19 and later · before 7.2.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.17affected
    • 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 and later · before e691eee886871b933d772ffc76d66c80b4c0a25eaffected · git
    • 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 and later · before 0a340ffd96943a49a78e367efac9517ca767d99baffected · git
    • 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 and later · before f7289e3492f2694dccd3d79287e0e31879b58650affected · git
    • 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 and later · before 65702339b3e9fd792f65d4b740928798194d86ceaffected · git
    • 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 and later · before 49b01f2939abc676a6f9a118f07a10110ee5f683affected · git
    • 81ba6afd6e6443d2bf4bf40f16df1f1f91c603f8 and later · before 7f16289b91eb316f170a6bd22d32e6c632f6a5b6affected · git
    • before 3.17not affected · semver
    • 6.1.188 and later · up to and including 6.1.*not affected · semver
    • 6.6.157 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1
openSUSE:Tumbleweedkernel-sourcebefore 7.2.9-1.17.2.9-1.1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-159998.55.16.4.0-159998.55.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-159998.55.1.159998.21.426.4.0-159998.55.1.159998.21.42
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-159998.55.16.4.0-159998.55.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-159998.55.16.4.0-159998.55.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-98159Sep 25, 2026 · wifi: mt76: mt7921: validate CLC firmware records
    22Monitor
  • ← EarlierCVE-2026-100070Sep 25, 2026 · netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet
    22Monitor
  • Later →CVE-2026-100072Sep 25, 2026 · ACPI: platform: Use acpi_bus_get_primary_device()
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0a340ffd96943a49a78e367efac9517ca767d99bVendor (CNA)
Linux Linux49b01f2939abc676a6f9a118f07a10110ee5f683Vendor (CNA)
Linux Linux65702339b3e9fd792f65d4b740928798194d86ceVendor (CNA)
Linux Linux7f16289b91eb316f170a6bd22d32e6c632f6a5b6Vendor (CNA)
Linux Linuxe691eee886871b933d772ffc76d66c80b4c0a25eVendor (CNA)
Linux Linuxf7289e3492f2694dccd3d79287e0e31879b58650Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.2.9-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:kernel-default6.4.0-159998.55.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-159998.55.1.159998.21.42 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-159998.55.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-159998.55.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. CVSS— → 5.5
  2. Severity— → medium
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records