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NVD / CVE Program· CNA Linux

CVE-2026-80584: s390/qeth: validate user buffer length in SNMP and ARP query ioctls

HighCVSS 8.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 33/100)

  • 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: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3083818e67bcd656965797fbac9a3d6c1d44f78a, 46443eaddebd84c51940857b11787229be169dec, 75fb3151513d7d9f77a8f9545418279b119c06b8; azl3 kernel 6.6.152.1-1 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 3083818e67bcd656965797fbac9a3d6c1d44f78a, 46443eaddebd84c51940857b11787229be169dec, 75fb3151513d7d9f77a8f9545418279b119c06b8; azl3 kernel 6.6.152.1-1 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: s390/qeth: validate user buffer length in SNMP and ARP query ioctls qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by a user-supplied length (udata_len) without checking a lower bound, then set udata_offset to a fixed non-zero value and pass both to a reply callback. The callback bounds-checks the copy with if ((udata_len - udata_offset) < len) Both fields are u32, so a udata_len smaller than udata_offset makes the subtraction wrap and the check pass, and the following memcpy() writes past the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from kzalloc(), which the existing NULL check does not catch. Reject buffers smaller than udata_offset before allocating, so the callback subtraction can no longer underflow.

Published
Aug 26, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.4
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-2026-80584

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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

    • 2.6.26affected
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before 9d00eeb2d27f4cc817c5e408760226d43f811ec6affected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before 46443eaddebd84c51940857b11787229be169decaffected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before 91935843f9396a9e45253e2c0d4337ca1371754baffected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before cc423f4105fe145b33e1d7cad34245a798358f73affected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before 3083818e67bcd656965797fbac9a3d6c1d44f78aaffected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before a3083647747942ea32faf14560d6397ff3068046affected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before 75fb3151513d7d9f77a8f9545418279b119c06b8affected · git
    • 4a71df50047f0db65ea09b1be155852e81a45eba and later · before d141f087b1af656f055d7c5793a3e87817ba0bbeaffected · git
    • before 2.6.26not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9kernelbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64kbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debugbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-develbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-cross-headersbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-debugbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-debug-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-debug-develbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8
AlmaLinux:9kernel-debug-modules-corebefore 5.14.0-687.66.1.el9_85.14.0-687.66.1.el9_8

+55

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-2026-80580Aug 26, 2026 · fbdev: bound mode sysfs output to the sysfs buffer
    31Monitor
  • ← EarlierCVE-2026-80581Aug 26, 2026 · ASoC: SOF: ipc4-pcm: Continue the pipeline trigger in case of IPC timeout
    0Monitor
  • Later →CVE-2026-80585Aug 26, 2026 · mptcp: fastopen: only mark MPTFO subflows with SYN data
    37Monitor

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 Linux3083818e67bcd656965797fbac9a3d6c1d44f78aVendor (CNA)
Linux Linux46443eaddebd84c51940857b11787229be169decVendor (CNA)
Linux Linux75fb3151513d7d9f77a8f9545418279b119c06b8Vendor (CNA)
Linux Linux91935843f9396a9e45253e2c0d4337ca1371754bVendor (CNA)
Linux Linux9d00eeb2d27f4cc817c5e408760226d43f811ec6Vendor (CNA)
Linux Linuxa3083647747942ea32faf14560d6397ff3068046Vendor (CNA)
Linux Linuxcc423f4105fe145b33e1d7cad34245a798358f73Vendor (CNA)
Linux Linuxd141f087b1af656f055d7c5793a3e87817ba0bbeVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.66.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)
rocky linux:kernel0:5.14.0-687.66.1.el9_8 · Rocky Linux:9Package 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.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

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
Low
Privileges required
None
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:L/PR:N/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