Vulnerability-Lookup

FKIE_CVE-2026-89994

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 15:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: dmaengine: fsl-edma: tracing: no ptr dereference during log output The fsl edma events store a pointer to a struct fsl_edma_engine in the ringbuffer and dereference it when a log entry is printed. At this time, the pointer may no longer be valid. Event injection can be used to trigger a crash: $ cd /sys/kernel/tracing $ echo 'value = 0' > events/fsl_edma/edma_writeb/inject $ cat trace The log output needs only edma->membase. Add a membase field at the end of the event and use the new field for log output. Keep the existing fields for backward compatibility.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2a3801ae5c344473e648006c5b03a9216ac54a6a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2ea04dca8e627f722caa7a2037cfbae0257f3501
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d382aaf5fed38c6dd2e0cc710d97cb81d660ffa7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ef02cd3807f39ae1dbc924788d8fa6a85334c435

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/fsl-edma-trace.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ef02cd3807f39ae1dbc924788d8fa6a85334c435",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            },
            {
              "lessThan": "d382aaf5fed38c6dd2e0cc710d97cb81d660ffa7",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            },
            {
              "lessThan": "2a3801ae5c344473e648006c5b03a9216ac54a6a",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            },
            {
              "lessThan": "2ea04dca8e627f722caa7a2037cfbae0257f3501",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/fsl-edma-trace.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fsl-edma: tracing: no ptr dereference during log output\n\nThe fsl edma events store a pointer to a struct fsl_edma_engine in the\nringbuffer and dereference it when a log entry is printed. At this time,\nthe pointer may no longer be valid.\n\nEvent injection can be used to trigger a crash:\n\n$ cd /sys/kernel/tracing\n$ echo \u0027value = 0\u0027 \u003e events/fsl_edma/edma_writeb/inject\n$ cat trace\n\nThe log output needs only edma-\u003emembase. Add a membase field at the end\nof the event and use the new field for log output. Keep the existing\nfields for backward compatibility."
    }
  ],
  "id": "CVE-2026-89994",
  "lastModified": "2026-09-16T15:18:23.037",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-16T11:17:10.593",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2a3801ae5c344473e648006c5b03a9216ac54a6a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ea04dca8e627f722caa7a2037cfbae0257f3501"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d382aaf5fed38c6dd2e0cc710d97cb81d660ffa7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ef02cd3807f39ae1dbc924788d8fa6a85334c435"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-89994 (GCVE-0-2026-89994)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-16 14:41

Title

dmaengine: fsl-edma: tracing: no ptr dereference during log output

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/ef02cd3807f39ae1d…
https://git.kernel.org/stable/c/d382aaf5fed38c6dd…
https://git.kernel.org/stable/c/2a3801ae5c344473e…
https://git.kernel.org/stable/c/2ea04dca8e627f722…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 11102d0c343ba06ddd303f2503c0ce46d70052f2 , < ef02cd3807f39ae1dbc924788d8fa6a85334c435 (git) Affected: 11102d0c343ba06ddd303f2503c0ce46d70052f2 , < d382aaf5fed38c6dd2e0cc710d97cb81d660ffa7 (git) Affected: 11102d0c343ba06ddd303f2503c0ce46d70052f2 , < 2a3801ae5c344473e648006c5b03a9216ac54a6a (git) Affected: 11102d0c343ba06ddd303f2503c0ce46d70052f2 , < 2ea04dca8e627f722caa7a2037cfbae0257f3501 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/fsl-edma-trace.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ef02cd3807f39ae1dbc924788d8fa6a85334c435",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            },
            {
              "lessThan": "d382aaf5fed38c6dd2e0cc710d97cb81d660ffa7",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            },
            {
              "lessThan": "2a3801ae5c344473e648006c5b03a9216ac54a6a",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            },
            {
              "lessThan": "2ea04dca8e627f722caa7a2037cfbae0257f3501",
              "status": "affected",
              "version": "11102d0c343ba06ddd303f2503c0ce46d70052f2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/fsl-edma-trace.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fsl-edma: tracing: no ptr dereference during log output\n\nThe fsl edma events store a pointer to a struct fsl_edma_engine in the\nringbuffer and dereference it when a log entry is printed. At this time,\nthe pointer may no longer be valid.\n\nEvent injection can be used to trigger a crash:\n\n$ cd /sys/kernel/tracing\n$ echo \u0027value = 0\u0027 \u003e events/fsl_edma/edma_writeb/inject\n$ cat trace\n\nThe log output needs only edma-\u003emembase. Add a membase field at the end\nof the event and use the new field for log output. Keep the existing\nfields for backward compatibility."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The stale dereference runs only when a local actor reads formatted fsl_edma events from tracefs (/sys/kernel/tracing/trace or trace_pipe). DMA MMIO tracing and event injection only enqueue ring-buffer records; there is no network, adjacent-radio, or physical-device path into TP_printk().\nAC:L - An attacker with tracefs access controls the full sequence: enable edma_log_io events, either inject a record via events/fsl_edma/*/inject or generate eDMA I/O then unbind/remove fsl-edma so the stored engine pointer is freed, then read trace. No race or uninfluenced victim state is required.\nPR:L - tracing_check_open_get_tr() enforces only LOCKDOWN_TRACEFS and DAC, with no capable() check. Event enable and trace files are mode 0640 and are routinely delegated via tracefs gid= to tracing-group members on Android Automotive/NXP i.MX, ChromeOS, and developer kernels, matching prior TP_printk UAF CVEs.\nUI:N - No victim interaction is required. The attacker enables fsl_edma events, injects or records a stale edma pointer, and reads the formatted trace themselves to invoke the vulnerable TP_printk() path.\nS:U - Impact stays inside the host kernel\u0027s trace formatting path (stale fsl_edma_engine dereference). This is standard local kernel memory-safety impact with no VM escape, IOMMU/DMA boundary bypass, or other cross-authority effect; membase is used only for log offset arithmetic.\nC:H - TP_printk() dereferences __entry-\u003eedma-\u003emembase when formatting output. That is a use-after-free read of a freed fsl_edma_engine, and with event injection the edma field is attacker-chosen, yielding an arbitrary kernel pointer read whose result is printed as the register offset.\nI:H - The bug is a use-after-free of the kernel heap object fsl_edma_engine, which embeds dma_device function pointers. Freed memory can be reclaimed before the trace read, enabling heap grooming and write/control-flow primitives; kernel CNA guidance rates UAF integrity impact as High.\nA:H - Dereferencing a NULL (inject with a zeroed edma pointer) or freed fsl_edma_engine pointer during trace formatting causes a kernel oops or panic. The fix commit demonstrates a deterministic crash via inject followed by cat trace."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:41:08.470Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ef02cd3807f39ae1dbc924788d8fa6a85334c435"
        },
        {
          "url": "https://git.kernel.org/stable/c/d382aaf5fed38c6dd2e0cc710d97cb81d660ffa7"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a3801ae5c344473e648006c5b03a9216ac54a6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ea04dca8e627f722caa7a2037cfbae0257f3501"
        }
      ],
      "title": "dmaengine: fsl-edma: tracing: no ptr dereference during log output",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89994",
    "datePublished": "2026-09-16T10:33:07.292Z",
    "dateReserved": "2026-09-11T19:38:34.780Z",
    "dateUpdated": "2026-09-16T14:41:08.470Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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