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CVE-2026-72005 (GCVE-0-2026-72005)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
wifi: rt2x00: avoid full teardown before work setup in probe
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: rt2x00: avoid full teardown before work setup in probe rt2x00lib_probe_dev() uses the full rt2x00lib_remove_dev() teardown for all probe failures. However, drv_data allocation and workqueue allocation can fail before intf_work, autowakeup_work and sleep_work have been initialized. Do not enter the full remove path until the probe has reached the point where those work items are set up. Return directly for drv_data allocation failure, and use a small early cleanup path for workqueue allocation failure. This issue was found by our static analysis tool and then confirmed by manual review of rt2x00lib_probe_dev() and rt2x00lib_remove_dev(). The early probe exits should not call a common teardown path that assumes the later work setup has already completed. A QEMU PoC forced alloc_ordered_workqueue() to fail before the work initializers are reached. The resulting fail path entered rt2x00lib_remove_dev(), and DEBUG_OBJECTS reported invalid work drains with rt2x00lib_probe_dev() and rt2x00lib_remove_dev() in the stack.
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: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 8b58d1f1356df6a7d2de3f55bb665b18b04ffda0 (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 59afe6148927395cf86f9429900e029a48b1d42b (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 3c0427d719bddb33caf18ff4ffb77cb47de7eb00 (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < eb7474d0253bb2de4793e1d3ce833e8564bbe732 (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 66bd9b1a72de7c2f5141b02d796048aafaed8a49 (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 816559409e340acaa5c9d868291dab30d8c80263 (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 56994852d704535ea354a4627ca667b1b4fa0deb (git)
Affected: 0439f5367c8d8bb2ebaca8d7329f51f3148b2fb2 , < 536fb3d739d75a03cb318c0c6fe799425cfea501 (git)
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Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (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)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rt2x00: avoid full teardown before work setup in probe\n\nrt2x00lib_probe_dev() uses the full rt2x00lib_remove_dev() teardown for\nall probe failures. However, drv_data allocation and workqueue allocation\ncan fail before intf_work, autowakeup_work and sleep_work have been\ninitialized.\n\nDo not enter the full remove path until the probe has reached the point\nwhere those work items are set up. Return directly for drv_data allocation\nfailure, and use a small early cleanup path for workqueue allocation\nfailure.\n\nThis issue was found by our static analysis tool and then confirmed by\nmanual review of rt2x00lib_probe_dev() and rt2x00lib_remove_dev(). The\nearly probe exits should not call a common teardown path that assumes the\nlater work setup has already completed.\n\nA QEMU PoC forced alloc_ordered_workqueue() to fail before the work\ninitializers are reached. The resulting fail path entered\nrt2x00lib_remove_dev(), and DEBUG_OBJECTS reported invalid work drains with\nrt2x00lib_probe_dev() and rt2x00lib_remove_dev() in the stack."
        }
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The flaw is in rt2x00 driver probe (rt2x00usb_probe/rt2x00pci_probe/rt2800soc_probe), triggered during device initialization on boot or hotplug, not by remote WiFi frames; worst case is built-in SoC/PCI WiFi on internet-facing routers/APs under local memory pressure.\nAC:L - An attacker can reliably force kzalloc or alloc_ordered_workqueue() to fail with a memory exhaustion attack and retry on reboot or USB reinsertion; success does not depend on uncontrollable layout or victim-only timing beyond attacker-driven ENOMEM.\nPR:L - Triggering probe-time ENOMEM requires only an unprivileged local process to exhaust memory during driver initialization; no CAP_NET_ADMIN, real root, or user-namespace capability is needed to reach the vulnerable teardown path.\nUI:N - Exploitation does not require a victim to click, mount, or configure anything; probe runs automatically at boot or on device hotplug while the attacker maintains memory pressure.\nS:U - Impact is confined to kernel/driver state on the host being probed; it is not a VM escape, sandbox breakout, or cross-authority boundary crossing beyond standard local kernel compromise.\nC:H - rt2x00lib_remove_dev() calls cancel_work_sync/cancel_delayed_work_sync and hrtimer_cancel on objects never initialized by INIT_WORK/hrtimer_setup, corrupting workqueue/timer metadata and creating undefined behavior that can expose kernel memory.\nI:H - Invalid cancel/flush/drain of uninitialized work items and tasklet_kill on uninitialized tasklets can corrupt adjacent kernel heap objects and workqueue state, plausibly yielding write primitives beyond a simple denial of service.\nA:H - A QEMU PoC forcing alloc_ordered_workqueue() failure hit DEBUG_OBJECTS invalid work drains in rt2x00lib_remove_dev(); this teardown path can WARN/OOPS/panic the kernel during probe failure cleanup."
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          "url": "https://git.kernel.org/stable/c/59afe6148927395cf86f9429900e029a48b1d42b"
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    "dateReserved": "2026-08-09T03:40:39.898Z",
    "dateUpdated": "2026-08-17T05:39:22.758Z",
    "state": "PUBLISHED"
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Return directly for drv_data allocation\\nfailure, and use a small early cleanup path for workqueue allocation\\nfailure.\\n\\nThis issue was found by our static analysis tool and then confirmed by\\nmanual review of rt2x00lib_probe_dev() and rt2x00lib_remove_dev(). The\\nearly probe exits should not call a common teardown path that assumes the\\nlater work setup has already completed.\\n\\nA QEMU PoC forced alloc_ordered_workqueue() to fail before the work\\ninitializers are reached. 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T05:26:37+00:00",
      "cve": "CVE-2026-72005",
      "id": "CVE-2026-72005",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: rt2x00: avoid full teardown before work setup in probe",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72005.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.

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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.
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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.