CVE-2026-89994 (GCVE-0-2026-89994)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-19 08:56
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
Impacted products
Vendor Product Version
Linux Linux Version: 11102d0c343ba06ddd303f2503c0ce46d70052f2
Version: 11102d0c343ba06ddd303f2503c0ce46d70052f2
Version: 11102d0c343ba06ddd303f2503c0ce46d70052f2
Version: 11102d0c343ba06ddd303f2503c0ce46d70052f2
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{
  "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",
              "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",
                  "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": "2026-10-19T08:56:08.384Z",
        "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": "2026-10-19T08:56:08.384Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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