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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
VLAI
Title
dmaengine: Fix possible use after free
Summary
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
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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."
        }
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              "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."
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    "dateReserved": "2026-08-09T03:40:39.934Z",
    "dateUpdated": "2026-08-17T05:44:40.606Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/dma/dmaengine.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"444f96066937f3fdf0e79b53289cff223c7d638b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"ab438a9efb9042c79d2f8db28a326d55feb8591f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"5876f38b67a309c00628942cb25679749b53b397\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"3b0240483dc977dbec4f3bc7a5383d4691ecb625\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"329ec20a86091d2a6e5b4fe507545e7d678a22a2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"0bc191050c3253da8ef4bfaf157c44efed6e22cd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f571515c332e00b3515dbe0859ceaa30ab66e00\",\"lessThan\":\"92f853f0645aebf1d05d333e97ab7c342ace1892\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/dma/dmaengine.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0bc191050c3253da8ef4bfaf157c44efed6e22cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/329ec20a86091d2a6e5b4fe507545e7d678a22a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b0240483dc977dbec4f3bc7a5383d4691ecb625\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/444f96066937f3fdf0e79b53289cff223c7d638b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5876f38b67a309c00628942cb25679749b53b397\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92f853f0645aebf1d05d333e97ab7c342ace1892\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9bdc8dce4068dadbdf7cf5ad6d4983e2afffedce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab438a9efb9042c79d2f8db28a326d55feb8591f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:08:19+00:00",
      "cve": "CVE-2026-72476",
      "id": "CVE-2026-72476",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dmaengine: Fix possible use after free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72476.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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