Vulnerability-Lookup

ubuntu-cve-2026-72476

Vulnerability from osv_ubuntu

Published

2026-08-15 06:22

Modified

2026-09-11 18:20

Summary

Details

In the Linux kernel, the following vulnerability has been resolved: dmaengine: Fix possible use after free In dma_release_channel(), check chan->device->privatecnt after call dma_chan_put(). However, dma_chan_put() call dma_device_put() which could release the last reference of the device if the DMA provider is already gone and hence free it. Fixes it by moving dma_chan_put() after the check.

Severity

7.8 (High)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-72476	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-72476	REPORT
	https://git.kernel.org/linus/92f853f0645aebf1d05d…	REPORT
	https://git.kernel.org/stable/c/0bc191050c3253da8…	REPORT
	https://git.kernel.org/stable/c/329ec20a86091d2a6…	REPORT
	https://git.kernel.org/stable/c/3b0240483dc977dbe…	REPORT
	https://git.kernel.org/stable/c/444f96066937f3fdf…	REPORT
	https://git.kernel.org/stable/c/5876f38b67a309c00…	REPORT
	https://git.kernel.org/stable/c/92f853f0645aebf1d…	REPORT
	https://git.kernel.org/stable/c/9bdc8dce4068dadbd…	REPORT
	https://git.kernel.org/stable/c/ab438a9efb9042c79…	REPORT

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CVE-2026-72476 (GCVE-0-2026-72476)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44

Title

dmaengine: Fix possible use after free

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

8 references

URL	Tags
https://git.kernel.org/stable/c/444f96066937f3fdf…
https://git.kernel.org/stable/c/ab438a9efb9042c79…
https://git.kernel.org/stable/c/9bdc8dce4068dadbd…
https://git.kernel.org/stable/c/5876f38b67a309c00…
https://git.kernel.org/stable/c/3b0240483dc977dbe…
https://git.kernel.org/stable/c/329ec20a86091d2a6…
https://git.kernel.org/stable/c/0bc191050c3253da8…
https://git.kernel.org/stable/c/92f853f0645aebf1d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 444f96066937f3fdf0e79b53289cff223c7d638b (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < ab438a9efb9042c79d2f8db28a326d55feb8591f (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 5876f38b67a309c00628942cb25679749b53b397 (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 3b0240483dc977dbec4f3bc7a5383d4691ecb625 (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 329ec20a86091d2a6e5b4fe507545e7d678a22a2 (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 0bc191050c3253da8ef4bfaf157c44efed6e22cd (git) Affected: 0f571515c332e00b3515dbe0859ceaa30ab66e00 , < 92f853f0645aebf1d05d333e97ab7c342ace1892 (git)
Linux	Linux	Affected: 2.6.30 Unaffected: 0 , < 2.6.30 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dmaengine.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "444f96066937f3fdf0e79b53289cff223c7d638b",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "ab438a9efb9042c79d2f8db28a326d55feb8591f",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "5876f38b67a309c00628942cb25679749b53b397",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "3b0240483dc977dbec4f3bc7a5383d4691ecb625",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "329ec20a86091d2a6e5b4fe507545e7d678a22a2",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "0bc191050c3253da8ef4bfaf157c44efed6e22cd",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            },
            {
              "lessThan": "92f853f0645aebf1d05d333e97ab7c342ace1892",
              "status": "affected",
              "version": "0f571515c332e00b3515dbe0859ceaa30ab66e00",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dmaengine.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix possible use after free\n\nIn dma_release_channel(), check chan-\u003edevice-\u003eprivatecnt after call\ndma_chan_put(). However, dma_chan_put() call dma_device_put() which could\nrelease the last reference of the device if the DMA provider is already\ngone and hence free it.\n\nFixes it by moving dma_chan_put() after the check."
        }
      ],
      "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 flaw is in dma_release_channel() in drivers/dma/dmaengine.c, reached only when kernel client drivers release a privately requested DMA channel during probe/remove/error teardown triggered by local device access (e.g., /dev/iio:device*, /dev/snd/*, /dev/tty*, spidev), not from any network packet or remote protocol handler.\nAC:L - An attacker can hold a DMA slave channel open via a client device, then close it to call dma_release_channel(); when the DMA provider has already unregistered via unbind, hot-unplug, or module teardown, dma_chan_put() frees dma_device and the subsequent privatecnt access is a reliably triggerable UAF with attacker-controlled release timing.\nPR:L - Exploitation requires only a local unprivileged process able to open a device whose driver uses dma_request_chan() or dma_request_channel(); on embedded ADI FPGA, Android, and industrial platforms, non-root application users commonly have such device-node access without init-namespace root or CAP_SYS_ADMIN.\nUI:N - No victim interaction is required beyond the attacker opening, holding, and closing their own device handle or racing driver teardown; no other user must mount filesystems, approve prompts, or perform separate actions for exploitation to succeed.\nS:U - This is a kernel slab use-after-free in the dmaengine channel-release path affecting the same kernel security authority; it does not cross VM, IOMMU, container, or other sandbox boundaries and is standard in-kernel memory corruption rather than a scope change.\nC:H - After dma_chan_put() frees the last dma_device kref, the code reads and decrements privatecnt and may clear cap_mask on freed kmalloc memory; UAF on dma_device objects enables disclosure of attacker-influenced freed-heap contents per kernel UAF scoring guidance.\nI:H - Post-free modification of privatecnt and cap_mask corrupts reused slab objects under attacker influence, providing a plausible kernel heap corruption path toward arbitrary write primitives, control-flow hijacking, or local privilege escalation.\nA:H - Dereferencing freed dma_device memory during dma_release_channel() can cause KASAN slab-use-after-free reports, kernel oops, BUG, or panic; kernel guidance treats any use-after-free as high availability impact even when full exploitation is not demonstrated."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:40.606Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/444f96066937f3fdf0e79b53289cff223c7d638b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab438a9efb9042c79d2f8db28a326d55feb8591f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce"
        },
        {
          "url": "https://git.kernel.org/stable/c/5876f38b67a309c00628942cb25679749b53b397"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b0240483dc977dbec4f3bc7a5383d4691ecb625"
        },
        {
          "url": "https://git.kernel.org/stable/c/329ec20a86091d2a6e5b4fe507545e7d678a22a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bc191050c3253da8ef4bfaf157c44efed6e22cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/92f853f0645aebf1d05d333e97ab7c342ace1892"
        }
      ],
      "title": "dmaengine: Fix possible use after free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72476",
    "datePublished": "2026-08-15T05:57:16.396Z",
    "dateReserved": "2026-08-09T03:40:39.934Z",
    "dateUpdated": "2026-08-17T05:44:40.606Z",
    "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.