CVE-2022-49944 (GCVE-0-2022-49944)

Vulnerability from cvelistv5 – Published: 2025-06-18 10:59 – Updated: 2026-08-05 08:56
VLAI
Title
Revert "usb: typec: ucsi: add a common function ucsi_unregister_connectors()"
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "usb: typec: ucsi: add a common function ucsi_unregister_connectors()" The recent commit 87d0e2f41b8c ("usb: typec: ucsi: add a common function ucsi_unregister_connectors()") introduced a regression that caused NULL dereference at reading the power supply sysfs. It's a stale sysfs entry that should have been removed but remains with NULL ops. The commit changed the error handling to skip the entries after a NULL con->wq, and this leaves the power device unreleased. For addressing the regression, the straight revert is applied here. Further code improvements can be done from the scratch again.
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: 87d0e2f41b8cc2018499be4e8003fa8c09b6f2fb , < 3d4044c9e6d2e3f11f1f8b5e0ee8647d3eb1afad (git)
Affected: 87d0e2f41b8cc2018499be4e8003fa8c09b6f2fb , < 5f73aa2cf8bef4a39baa1591c3144ede4788826e (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.19.8 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The bug is triggered by reading the leftover UCSI power-supply sysfs attributes under /sys/class/power_supply/ after a failed connector registration path; that is local sysfs access, not network packet processing or a physical USB plug-in attack.\nAC:L - On affected UCSI systems the failed ucsi_register_altmodes() path deterministically leaves a dangling psy with freed desc, and any subsequent world-readable sysfs read reliably exercises the UAF with no attacker-uncontrollable race.\nPR:L - Power-supply property sysfs attributes are mode 0444 (S_IRUSR|S_IRGRP|S_IROTH), so an unprivileged local user can open and read them without capabilities or init-namespace root.\nUI:N - The attacker only needs to read the stale power-supply sysfs node themselves; no separate victim mount, click, or confirmation is required.\nS:U - Impact stays inside the host kernel UCSI/power_supply authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - ucsi_unregister_connectors() kfree\u0027s the connector array while the still-registered psy-\u003edesc and drv_data point into that freed object, yielding a heap UAF that can be reclaimed and leveraged for arbitrary kernel read.\nI:H - The freed embedded power_supply_desc contains the get_property function pointer invoked on every sysfs property read, giving a classic UAF control-flow/write primitive once the slab object is groomed.\nA:H - The same dangling desc path was observed as a kernel NULL-dereference oops when reading power-supply sysfs, which is a high availability impact (oops/panic under panic_on_oops)."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"usb: typec: ucsi: add a common function ucsi_unregister_connectors()\"\n\nThe recent commit 87d0e2f41b8c (\"usb: typec: ucsi: add a common\nfunction ucsi_unregister_connectors()\") introduced a regression that\ncaused NULL dereference at reading the power supply sysfs.  It\u0027s a\nstale sysfs entry that should have been removed but remains with NULL\nops.  The commit changed the error handling to skip the entries after\na NULL con-\u003ewq, and this leaves the power device unreleased.\n\nFor addressing the regression, the straight revert is applied here.\nFurther code improvements can be done from the scratch again."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Revertir \"usb: typec: ucsi: a\u00f1adir una funci\u00f3n com\u00fan ucsi_unregister_connectors()\". La reciente confirmaci\u00f3n 87d0e2f41b8c (\"usb: typec: ucsi: a\u00f1adir una funci\u00f3n com\u00fan ucsi_unregister_connectors()\") introdujo una regresi\u00f3n que provocaba una desreferencia nula al leer el archivo sysfs de la fuente de alimentaci\u00f3n. Se trata de una entrada obsoleta del archivo sysfs que deber\u00eda haberse eliminado, pero que permanece con operaciones nulas. el commit modific\u00f3 la gesti\u00f3n de errores para omitir las entradas despu\u00e9s de un comando con-\u0026gt;wq nulo, lo que deja el dispositivo de alimentaci\u00f3n sin liberar. Para solucionar la regresi\u00f3n, se aplica la reversi\u00f3n directa. Se pueden realizar mejoras de c\u00f3digo desde cero."
          }
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      "current_release_date": "2026-08-04T19:42:17+00:00",
      "cve": "CVE-2022-49944",
      "id": "CVE-2022-49944",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "487",
      "product_status:known_affected": "22",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: Revert \"usb: typec: ucsi: add a common function ucsi_unregister_connectors()\"",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49944.json",
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}



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



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