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NVD / CVE Program· CNA Linux

CVE-2026-98027: net: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size

HighCVSS 7.0 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 01124cd2cf4b71755b1130ac82d78dcfbd5d69e3, 44cd4674d9aa5bdf793b8a8b481c9e8536ed6070, 609c4378f212cf580aae02250f1146caf63d873f; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01124cd2cf4b71755b1130ac82d78dcfbd5d69e3, 44cd4674d9aa5bdf793b8a8b481c9e8536ed6070, 609c4378f212cf580aae02250f1146caf63d873f; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: dsa: mv88e6xxx: bound the policy rule dump by the caller's buffer size mv88e6xxx_get_rxnfc() uses rxnfc->rule_cnt as the write index while dumping the policy IDR, clobbering the input value before it has been looked at. That input is the number of entries the caller had room for. ETHTOOL_GRXCLSRLALL requires no CAP_NET_ADMIN and the ioctl sizes the buffer from the rule_cnt userspace passes in, so once an admin has installed policy rules any user can ask for fewer slots than there are rules and run off the end of the allocation. A rule_cnt of 0 leaves the buffer pointer NULL and the walk dereferences it. Count into a local so the caller's limit survives the walk, and stop with -EMSGSIZE once it is reached.

Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 1th percentile
CWE
—

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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.

Follow CVE-2026-98027

When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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.

—

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

    • 5.4affected
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before 7e4bfc5f0b66feb22cba821303fc25ca22cd0887affected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before 01124cd2cf4b71755b1130ac82d78dcfbd5d69e3affected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before 609c4378f212cf580aae02250f1146caf63d873faffected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before c5b5c52b6524c9fb50def2260baac745c095ec3aaffected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before 44cd4674d9aa5bdf793b8a8b481c9e8536ed6070affected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before 7a683c2b062810bca203e41866389daf387c235baffected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before cda5ac8fe8ac8e80b1703ebb8c4250726fc19739affected · git
    • da7dc87553046a43be1620a783ce3d9f6583d322 and later · before b1fffc273112e7284c5b705e186b43b5770cd3d5affected · git
    • before 5.4not 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 7.2.7-17.2.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98025Sep 25, 2026 · net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow
    0Monitor
  • ← EarlierCVE-2026-98026Sep 25, 2026 · net: bridge: mcast: properly convert mglist to rcu
    0Monitor
  • Later →CVE-2026-98028Sep 25, 2026 · eth: nfp: drop the replaced rule from the list when reprogramming fails
    0Monitor

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 Linux01124cd2cf4b71755b1130ac82d78dcfbd5d69e3Vendor (CNA)
Linux Linux44cd4674d9aa5bdf793b8a8b481c9e8536ed6070Vendor (CNA)
Linux Linux609c4378f212cf580aae02250f1146caf63d873fVendor (CNA)
Linux Linux7a683c2b062810bca203e41866389daf387c235bVendor (CNA)
Linux Linux7e4bfc5f0b66feb22cba821303fc25ca22cd0887Vendor (CNA)
Linux Linuxb1fffc273112e7284c5b705e186b43b5770cd3d5Vendor (CNA)
Linux Linuxc5b5c52b6524c9fb50def2260baac745c095ec3aVendor (CNA)
Linux Linuxcda5ac8fe8ac8e80b1703ebb8c4250726fc19739Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · 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)

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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.

References

Show all references (7 more)

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

All records