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NVD / CVE Program· CNA Linux

CVE-2026-80689: tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 12b80cdbc54cf615b4717a4e8180063408091ea2, 2df964d141270c40f07547b0c2e0a51e2573d46d, 4e4ab09db7899d7f2d2293a18adf0fa200a27e73; 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 12b80cdbc54cf615b4717a4e8180063408091ea2, 2df964d141270c40f07547b0c2e0a51e2573d46d, 4e4ab09db7899d7f2d2293a18adf0fa200a27e73; 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: tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions mmio_trace_rw() and mmio_trace_mapping() retrieve mmio_trace_array into tr and pass it to __trace_mmiotrace_rw() and __trace_mmiotrace_map(). If these functions are invoked while mmio_trace_array is NULL (e.g. before initialization or after disabled), accessing tr->array_buffer.buffer will result in a NULL pointer dereference crash. Fix this by adding an explicit NULL check for tr at the beginning of __trace_mmiotrace_rw() and __trace_mmiotrace_map().

—No exploit Fix available
Published
Aug 28, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
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

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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

    • 2.6.27affected
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before dc1b1a057b3bb901f83433700e604fe0ae67c5f2affected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before 6aee2d478545c089dd5d055d3c9f0c7ea034fb80affected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before 4e4ab09db7899d7f2d2293a18adf0fa200a27e73affected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before 2df964d141270c40f07547b0c2e0a51e2573d46daffected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before 876014b4eeb927146430e7591cf959a7ceb8d64aaffected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before a20a0010eb6485f60cd64e15ebc85a4bd388642eaffected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before 60234845142fddb27db89ebc00a65178421fb3a4affected · git
    • f984b51e0779a6dd30feedc41404013ca54e5d05 and later · before 12b80cdbc54cf615b4717a4e8180063408091ea2affected · git
    • before 2.6.27not 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 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

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-2026-80687Aug 28, 2026 · iommufd/viommu: Release the igroup lock on the vdevice_size error path
    0Monitor
  • ← EarlierCVE-2026-80688Aug 28, 2026 · riscv: drop __init from vec_check_unaligned_access_speed_all_cpus
    0Monitor
  • Later →CVE-2026-80690Aug 28, 2026 · scsi: ufs: core: Initialize hba->rpmbs list in ufshcd
    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 Linux12b80cdbc54cf615b4717a4e8180063408091ea2Vendor (CNA)
Linux Linux2df964d141270c40f07547b0c2e0a51e2573d46dVendor (CNA)
Linux Linux4e4ab09db7899d7f2d2293a18adf0fa200a27e73Vendor (CNA)
Linux Linux60234845142fddb27db89ebc00a65178421fb3a4Vendor (CNA)
Linux Linux6aee2d478545c089dd5d055d3c9f0c7ea034fb80Vendor (CNA)
Linux Linux876014b4eeb927146430e7591cf959a7ceb8d64aVendor (CNA)
Linux Linuxa20a0010eb6485f60cd64e15ebc85a4bd388642eVendor (CNA)
Linux Linuxdc1b1a057b3bb901f83433700e604fe0ae67c5f2Vendor (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)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.105-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.107-1~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).

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Fix✗ → ✓

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References

Show all references (7 more)

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

All records