CVE-2022-49944 (GCVE-0-2022-49944)
Vulnerability from cvelistv5
Published
2025-06-18 10:59
Modified
2026-08-05 08:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 87d0e2f41b8cc2018499be4e8003fa8c09b6f2fb
Version: 87d0e2f41b8cc2018499be4e8003fa8c09b6f2fb
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3d4044c9e6d2e3f11f1f8b5e0ee8647d3eb1afad",
              "status": "affected",
              "version": "87d0e2f41b8cc2018499be4e8003fa8c09b6f2fb",
              "versionType": "git"
            },
            {
              "lessThan": "5f73aa2cf8bef4a39baa1591c3144ede4788826e",
              "status": "affected",
              "version": "87d0e2f41b8cc2018499be4e8003fa8c09b6f2fb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.8",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:56:49.285Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3d4044c9e6d2e3f11f1f8b5e0ee8647d3eb1afad"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f73aa2cf8bef4a39baa1591c3144ede4788826e"
        }
      ],
      "title": "Revert \"usb: typec: ucsi: add a common function ucsi_unregister_connectors()\"",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49944",
    "datePublished": "2025-06-18T10:59:59.319Z",
    "dateReserved": "2025-06-18T10:57:27.381Z",
    "dateUpdated": "2026-08-05T08:56:49.285Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.