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CVE-2026-80689 (GCVE-0-2026-80689)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-09-14 11:58
VLAI
Title
tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions
Summary
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < dc1b1a057b3bb901f83433700e604fe0ae67c5f2 (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < 6aee2d478545c089dd5d055d3c9f0c7ea034fb80 (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < 4e4ab09db7899d7f2d2293a18adf0fa200a27e73 (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < 2df964d141270c40f07547b0c2e0a51e2573d46d (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < 876014b4eeb927146430e7591cf959a7ceb8d64a (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < a20a0010eb6485f60cd64e15ebc85a4bd388642e (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < 60234845142fddb27db89ebc00a65178421fb3a4 (git)
Affected: f984b51e0779a6dd30feedc41404013ca54e5d05 , < 12b80cdbc54cf615b4717a4e8180063408091ea2 (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions\n\nmmio_trace_rw() and mmio_trace_mapping() retrieve mmio_trace_array into\ntr and pass it to __trace_mmiotrace_rw() and __trace_mmiotrace_map().\nIf these functions are invoked while mmio_trace_array is NULL (e.g. before\ninitialization or after disabled), accessing tr-\u003earray_buffer.buffer will\nresult in a NULL pointer dereference crash.\n\nFix this by adding an explicit NULL check for tr at the beginning of\n__trace_mmiotrace_rw() and __trace_mmiotrace_map()."
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    "cveId": "CVE-2026-80689",
    "datePublished": "2026-08-28T06:52:53.724Z",
    "dateReserved": "2026-08-26T14:34:25.785Z",
    "dateUpdated": "2026-09-14T11:58:50.409Z",
    "state": "PUBLISHED"
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      "date": "2026-09-15",
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    },
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      "cve": "CVE-2026-80689",
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      "initial_release_date": "2026-08-29T01:07:26.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80689.json",
      "version": "2"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-31T07:37:22+00:00",
      "cve": "CVE-2026-80689",
      "id": "CVE-2026-80689",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing/mmiotrace: Add NULL check for mmio_trace_array in logging functions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80689.json",
      "version": "3"
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      "current_release_date": "2026-09-16T00:06:18Z",
      "cve": "CVE-2026-80689",
      "id": "CVE-2026-80689",
      "initial_release_date": "2026-08-28T16:34:05Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80689",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80689.json",
      "version": "5"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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