CVE-2026-80659 (GCVE-0-2026-80659)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:49 – Updated: 2026-08-28 06:49
VLAI
Title
mmc: vub300: defer reset until cmd_mutex is unlocked
Summary
In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: defer reset until cmd_mutex is unlocked vub300_cmndwork_thread() holds cmd_mutex while it sends a command and waits for the command response. If the response wait times out, __vub300_command_response() kills the command URBs and then synchronously resets the USB device through usb_reset_device(). That reset path re-enters the driver through vub300_pre_reset(), which also takes cmd_mutex. The worker therefore tries to acquire the same mutex recursively while it is still holding it from the command path. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the real worker and timeout/reset carrier: vub300_cmndwork_thread() __vub300_command_response() usb_lock_device_for_reset() usb_reset_device() vub300_pre_reset() Lockdep reported the same-task recursive acquisition on cmd_mutex: WARNING: possible recursive locking detected ... (&test_vub300.cmd_mutex) ... at: usb_reset_device... [vuln_msv] ... (&test_vub300.cmd_mutex) ... at: vub300_cmndwork_thread+0x12/0x20 [vuln_msv] Workqueue: vub300_cmd_wq vub300_cmndwork_thread [vuln_msv] *** DEADLOCK *** Return a flag from __vub300_command_response() when the timeout path needs a device reset, then perform the reset after vub300_cmndwork_thread() has cleared the in-flight command state and dropped cmd_mutex. The reset is still attempted before mmc_request_done(), preserving the existing request completion ordering while avoiding the recursive lock.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < 8672b8bdbd2063b3fcbd75f729e4706fcdad2257 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < 8344611477c9241f45f20981990780fc5f0996f8 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < 2e6b9a394206c76dd417c991312f349435ef35e6 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < 7ee7a77ec2f446109ab52cc80ace7acc22ab6211 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < 9f5e04235a0b59e6e30af9f45511addf2604d757 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < bf9848a22a8e50d39d5e8d871581f0a8110f16b3 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < c2e1d33929565fa14c48d8a5a45edc3ebfc941b2 (git)
Affected: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 , < ee5fb641c4ccac8406c668d3e947eb20ce44f233 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (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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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: vub300: defer reset until cmd_mutex is unlocked\n\nvub300_cmndwork_thread() holds cmd_mutex while it sends a command and\nwaits for the command response.  If the response wait times out,\n__vub300_command_response() kills the command URBs and then synchronously\nresets the USB device through usb_reset_device().\n\nThat reset path re-enters the driver through vub300_pre_reset(), which\nalso takes cmd_mutex.  The worker therefore tries to acquire the same\nmutex recursively while it is still holding it from the command path.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the real worker and timeout/reset carrier:\n\n  vub300_cmndwork_thread()\n  __vub300_command_response()\n  usb_lock_device_for_reset()\n  usb_reset_device()\n  vub300_pre_reset()\n\nLockdep reported the same-task recursive acquisition on cmd_mutex:\n\n  WARNING: possible recursive locking detected\n  ... (\u0026test_vub300.cmd_mutex) ... at: usb_reset_device... [vuln_msv]\n  ... (\u0026test_vub300.cmd_mutex) ... at: vub300_cmndwork_thread+0x12/0x20 [vuln_msv]\n  Workqueue: vub300_cmd_wq vub300_cmndwork_thread [vuln_msv]\n  *** DEADLOCK ***\n\nReturn a flag from __vub300_command_response() when the timeout path needs\na device reset, then perform the reset after vub300_cmndwork_thread() has\ncleared the in-flight command state and dropped cmd_mutex.  The reset is\nstill attempted before mmc_request_done(), preserving the existing request\ncompletion ordering while avoiding the recursive lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:49:04.389Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8672b8bdbd2063b3fcbd75f729e4706fcdad2257"
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          "url": "https://git.kernel.org/stable/c/8344611477c9241f45f20981990780fc5f0996f8"
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          "url": "https://git.kernel.org/stable/c/c2e1d33929565fa14c48d8a5a45edc3ebfc941b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee5fb641c4ccac8406c668d3e947eb20ce44f233"
        }
      ],
      "title": "mmc: vub300: defer reset until cmd_mutex is unlocked",
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        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80659",
    "datePublished": "2026-08-28T06:49:04.389Z",
    "dateReserved": "2026-08-26T14:34:25.780Z",
    "dateUpdated": "2026-08-28T06:49:04.389Z",
    "state": "PUBLISHED"
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The worker therefore tries to acquire the same\\nmutex recursively while it is still holding it from the command path.\\n\\nThis issue was found by our static analysis tool and then manually\\nreviewed against the current tree.\\n\\nThe grounded PoC kept the real worker and timeout/reset carrier:\\n\\n  vub300_cmndwork_thread()\\n  __vub300_command_response()\\n  usb_lock_device_for_reset()\\n  usb_reset_device()\\n  vub300_pre_reset()\\n\\nLockdep reported the same-task recursive acquisition on cmd_mutex:\\n\\n  WARNING: possible recursive locking detected\\n  ... (\u0026test_vub300.cmd_mutex) ... at: usb_reset_device... [vuln_msv]\\n  ... (\u0026test_vub300.cmd_mutex) ... at: vub300_cmndwork_thread+0x12/0x20 [vuln_msv]\\n  Workqueue: vub300_cmd_wq vub300_cmndwork_thread [vuln_msv]\\n  *** DEADLOCK ***\\n\\nReturn a flag from __vub300_command_response() when the timeout path needs\\na device reset, then perform the reset after vub300_cmndwork_thread() has\\ncleared the in-flight command state and dropped cmd_mutex.  The reset is\\nstill attempted before mmc_request_done(), preserving the existing request\\ncompletion ordering while avoiding the recursive lock.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/mmc/host/vub300.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"8672b8bdbd2063b3fcbd75f729e4706fcdad2257\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"8344611477c9241f45f20981990780fc5f0996f8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"2e6b9a394206c76dd417c991312f349435ef35e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"7ee7a77ec2f446109ab52cc80ace7acc22ab6211\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"9f5e04235a0b59e6e30af9f45511addf2604d757\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"bf9848a22a8e50d39d5e8d871581f0a8110f16b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"c2e1d33929565fa14c48d8a5a45edc3ebfc941b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"88095e7b473a3d9ec3b9c60429576e9cbd327c89\",\"lessThan\":\"ee5fb641c4ccac8406c668d3e947eb20ce44f233\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/mmc/host/vub300.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.0\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2e6b9a394206c76dd417c991312f349435ef35e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ee7a77ec2f446109ab52cc80ace7acc22ab6211\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8344611477c9241f45f20981990780fc5f0996f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8672b8bdbd2063b3fcbd75f729e4706fcdad2257\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f5e04235a0b59e6e30af9f45511addf2604d757\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf9848a22a8e50d39d5e8d871581f0a8110f16b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2e1d33929565fa14c48d8a5a45edc3ebfc941b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee5fb641c4ccac8406c668d3e947eb20ce44f233\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T07:40:07+00:00",
      "cve": "CVE-2026-80659",
      "id": "CVE-2026-80659",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mmc: vub300: defer reset until cmd_mutex is unlocked",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80659.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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  • 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 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.