FKIE_CVE-2026-80659

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e6b9a394206c76dd417c991312f349435ef35e6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ee7a77ec2f446109ab52cc80ace7acc22ab6211
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8344611477c9241f45f20981990780fc5f0996f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8672b8bdbd2063b3fcbd75f729e4706fcdad2257
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f5e04235a0b59e6e30af9f45511addf2604d757
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf9848a22a8e50d39d5e8d871581f0a8110f16b3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2e1d33929565fa14c48d8a5a45edc3ebfc941b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee5fb641c4ccac8406c668d3e947eb20ce44f233
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/vub300.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8672b8bdbd2063b3fcbd75f729e4706fcdad2257",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "8344611477c9241f45f20981990780fc5f0996f8",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "2e6b9a394206c76dd417c991312f349435ef35e6",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "7ee7a77ec2f446109ab52cc80ace7acc22ab6211",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "9f5e04235a0b59e6e30af9f45511addf2604d757",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "bf9848a22a8e50d39d5e8d871581f0a8110f16b3",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "c2e1d33929565fa14c48d8a5a45edc3ebfc941b2",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            },
            {
              "lessThan": "ee5fb641c4ccac8406c668d3e947eb20ce44f233",
              "status": "affected",
              "version": "88095e7b473a3d9ec3b9c60429576e9cbd327c89",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/vub300.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.0"
            },
            {
              "lessThan": "3.0",
              "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-80659",
  "lastModified": "2026-08-28T08:16:51.020",
  "metrics": {},
  "published": "2026-08-28T08:16:51.020",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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