CVE-2026-72486 (GCVE-0-2026-72486)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:15
VLAI
Title
mailbox: mtk-adsp: fix UAF during device teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: mailbox: mtk-adsp: fix UAF during device teardown When the SOF audio driver fails to initialize (e.g. firmware boot timeout), its devres unwind frees the snd_sof_dev object that the mailbox client (mtk-adsp-ipc) reaches via chan->cl->rx_callback. The mtk-adsp-mailbox shutdown clears the mailbox command registers but leaves the IRQ line unmasked, so a late interrupt can still queue a threaded handler after mbox_free_channel() had cleared chan->cl, and mbox_chan_received_data() would then trigger UAF: BUG: KASAN: slab-use-after-free in sof_ipc3_validate_fw_version sof_ipc3_validate_fw_version sof_ipc3_do_rx_work sof_ipc3_rx_msg mt8196_dsp_handle_request mtk_adsp_ipc_recv mbox_chan_received_data mtk_adsp_mbox_isr irq_thread_fn Freed by task ...: kfree devres_release_all really_probe ... (sof-audio-of-mt8196 probe failure) The crash was observed roughly three seconds after the failed probe. disable_irq() in shutdown and enable_irq() in startup. disable_irq() also waits for any in-flight interrupts, so by the time mbox_free_channel() proceeds to clear chan->cl no rx_callback can run. In addition, request the IRQ with IRQF_NO_AUTOEN so it stays masked between probe and the first client bind — otherwise an early interrupt can crash on chan->cl == NULL in mbox_chan_received_data().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: af2dfa96c52d042df5deb29fb6e32d3ff4d76a61 , < b6337a08a63eef8efcffe3c01d479badda6bbbdb (git)
Affected: af2dfa96c52d042df5deb29fb6e32d3ff4d76a61 , < e519c1d8c5efb5cd8d4c5bb3fe39b1bbb812bdb9 (git)
Affected: af2dfa96c52d042df5deb29fb6e32d3ff4d76a61 , < fc6c3deb1d4c0adebf7dee0b8af4082af3f17690 (git)
Affected: af2dfa96c52d042df5deb29fb6e32d3ff4d76a61 , < 7d881615fb6373f71fc628b3f00186aeca87a3d5 (git)
Affected: af2dfa96c52d042df5deb29fb6e32d3ff4d76a61 , < 25d6ea6c76e1b1b7c57337b2f8f1b6fc8d5c52bc (git)
Affected: af2dfa96c52d042df5deb29fb6e32d3ff4d76a61 , < b57d1a40bc43258372fa1f4d39305e093947a262 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (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\nmailbox: mtk-adsp: fix UAF during device teardown\n\nWhen the SOF audio driver fails to initialize (e.g. firmware boot\ntimeout), its devres unwind frees the snd_sof_dev object that the\nmailbox client (mtk-adsp-ipc) reaches via chan-\u003ecl-\u003erx_callback.\nThe mtk-adsp-mailbox shutdown clears the mailbox command registers\nbut leaves the IRQ line unmasked, so a late interrupt can still\nqueue a threaded handler after mbox_free_channel() had cleared\nchan-\u003ecl, and mbox_chan_received_data() would then trigger UAF:\n\n  BUG: KASAN: slab-use-after-free in sof_ipc3_validate_fw_version\n   sof_ipc3_validate_fw_version\n   sof_ipc3_do_rx_work\n   sof_ipc3_rx_msg\n   mt8196_dsp_handle_request\n   mtk_adsp_ipc_recv\n   mbox_chan_received_data\n   mtk_adsp_mbox_isr\n   irq_thread_fn\n  Freed by task ...:\n   kfree\n   devres_release_all\n   really_probe\n   ... (sof-audio-of-mt8196 probe failure)\n\nThe crash was observed roughly three seconds after the failed probe.\n\ndisable_irq() in shutdown and enable_irq() in startup. disable_irq()\nalso waits for any in-flight interrupts, so by the time\nmbox_free_channel() proceeds to clear chan-\u003ecl no rx_callback can run.\n\nIn addition, request the IRQ with IRQF_NO_AUTOEN so it stays masked\nbetween probe and the first client bind \u2014 otherwise an early interrupt\ncan crash on chan-\u003ecl == NULL in mbox_chan_received_data()."
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    "cveId": "CVE-2026-72486",
    "datePublished": "2026-08-15T05:57:22.821Z",
    "dateReserved": "2026-08-09T03:40:39.936Z",
    "dateUpdated": "2026-08-17T05:15:36.888Z",
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(sof-audio-of-mt8196 probe failure)\\n\\nThe crash was observed roughly three seconds after the failed probe.\\n\\ndisable_irq() in shutdown and enable_irq() in startup. disable_irq()\\nalso waits for any in-flight interrupts, so by the time\\nmbox_free_channel() proceeds to clear chan-\u003ecl no rx_callback can run.\\n\\nIn addition, request the IRQ with IRQF_NO_AUTOEN so it stays masked\\nbetween probe and the first client bind \u2014 otherwise an early interrupt\\ncan crash on chan-\u003ecl == NULL in mbox_chan_received_data().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/mailbox/mtk-adsp-mailbox.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"af2dfa96c52d042df5deb29fb6e32d3ff4d76a61\",\"lessThan\":\"b6337a08a63eef8efcffe3c01d479badda6bbbdb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af2dfa96c52d042df5deb29fb6e32d3ff4d76a61\",\"lessThan\":\"e519c1d8c5efb5cd8d4c5bb3fe39b1bbb812bdb9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af2dfa96c52d042df5deb29fb6e32d3ff4d76a61\",\"lessThan\":\"fc6c3deb1d4c0adebf7dee0b8af4082af3f17690\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af2dfa96c52d042df5deb29fb6e32d3ff4d76a61\",\"lessThan\":\"7d881615fb6373f71fc628b3f00186aeca87a3d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af2dfa96c52d042df5deb29fb6e32d3ff4d76a61\",\"lessThan\":\"25d6ea6c76e1b1b7c57337b2f8f1b6fc8d5c52bc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af2dfa96c52d042df5deb29fb6e32d3ff4d76a61\",\"lessThan\":\"b57d1a40bc43258372fa1f4d39305e093947a262\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/mailbox/mtk-adsp-mailbox.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/25d6ea6c76e1b1b7c57337b2f8f1b6fc8d5c52bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d881615fb6373f71fc628b3f00186aeca87a3d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b57d1a40bc43258372fa1f4d39305e093947a262\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6337a08a63eef8efcffe3c01d479badda6bbbdb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e519c1d8c5efb5cd8d4c5bb3fe39b1bbb812bdb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc6c3deb1d4c0adebf7dee0b8af4082af3f17690\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:07:06+00:00",
      "cve": "CVE-2026-72486",
      "id": "CVE-2026-72486",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mailbox: mtk-adsp: fix UAF during device teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72486.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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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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