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 CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00177.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < dc1b1a057b3bb901f83433700e604fe0ae67c5f2
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < 6aee2d478545c089dd5d055d3c9f0c7ea034fb80
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < 4e4ab09db7899d7f2d2293a18adf0fa200a27e73
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < 2df964d141270c40f07547b0c2e0a51e2573d46d
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < 876014b4eeb927146430e7591cf959a7ceb8d64a
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < a20a0010eb6485f60cd64e15ebc85a4bd388642e
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < 60234845142fddb27db89ebc00a65178421fb3a4
f984b51e0779a6dd30feedc41404013ca54e5d05 affected < 12b80cdbc54cf615b4717a4e8180063408091ea2
Linux Linux affected
Version Status Constraints
2.6.27 affected —
0 unaffected < 2.6.27
5.10.270 unaffected ≤ 5.10.*
5.15.221 unaffected ≤ 5.15.*
6.1.188 unaffected ≤ 6.1.*
6.6.157 unaffected ≤ 6.6.*
6.12.103 unaffected ≤ 6.12.*
6.18.44 unaffected ≤ 6.18.*
7.1.8 unaffected ≤ 7.1.*
7.2 unaffected ≤ *

No data.

No data.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4788-1 linux-6.12 security update
Debian DLA Debian DLA DLA-4841-1 linux security update
Ubuntu USN Ubuntu USN USN-8961-1 Linux kernel vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/12b80cdbc54cf615b4717a4e8180063408091ea2 cve-icon cve-icon
https://git.kernel.org/stable/c/2df964d141270c40f07547b0c2e0a51e2573d46d cve-icon cve-icon
https://git.kernel.org/stable/c/4e4ab09db7899d7f2d2293a18adf0fa200a27e73 cve-icon cve-icon
https://git.kernel.org/stable/c/60234845142fddb27db89ebc00a65178421fb3a4 cve-icon cve-icon
https://git.kernel.org/stable/c/6aee2d478545c089dd5d055d3c9f0c7ea034fb80 cve-icon cve-icon
https://git.kernel.org/stable/c/876014b4eeb927146430e7591cf959a7ceb8d64a cve-icon cve-icon
https://git.kernel.org/stable/c/a20a0010eb6485f60cd64e15ebc85a4bd388642e cve-icon cve-icon
https://git.kernel.org/stable/c/dc1b1a057b3bb901f83433700e604fe0ae67c5f2 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2026082803-CVE-2026-80689-f3d3@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-80689 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-80689 cve-icon
History

Sat, 07 Nov 2026 07:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 14 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
References

Mon, 31 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Fri, 28 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Fri, 28 Aug 2026 07:30:00 +0000

Type Values Removed Values Added
Description 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().
Title tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-11-06T17:05:53.098Z

Reserved: 2026-08-26T14:34:25.785Z

Link: CVE-2026-80689

cve-icon Vulnrichment

Updated: 2026-11-06T17:02:48.094Z

cve-icon NVD

Status : Received

Published: 2026-08-28T08:16:54.390

Modified: 2026-11-06T17:19:56.707

Link: CVE-2026-80689

cve-icon Redhat

Severity : Low

Publid Date: 2026-08-28T00:00:00Z

Links: CVE-2026-80689 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-31T14:30:09Z

Weaknesses