CVE-2026-89797 (GCVE-0-2026-89797)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: ab8500_fg: fix use-after-free on remove ab8500_fg_remove() destroys the driver workqueue while the threaded interrupt handlers are still armed; they are devm-managed and freed only after ->remove() returns, so a handler that fires in that window queues work on the freed workqueue. Tear the workqueue down through devm instead, registering its cleanup after the power supply and before the interrupt requests. devm then frees the interrupts first, so the handlers can no longer queue work, before disabling the delayed and plain work items and destroying the workqueue. Disabling the items, rather than cancelling them, keeps them disabled so no producer (including the power-supply external_power_changed callback) can requeue them. Found by an in-house static analysis tool.
References
Impacted products
Vendor Product Version
Linux Linux Version: 13151631b5bd06a1511353bb221079bbd76606c3
Version: 13151631b5bd06a1511353bb221079bbd76606c3
Version: 13151631b5bd06a1511353bb221079bbd76606c3
Version: 13151631b5bd06a1511353bb221079bbd76606c3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/power/supply/ab8500_fg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c2ce9b8f325f522e10e4d262b37ae49deb83e79b",
              "status": "affected",
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              "versionType": "git"
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        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.4"
            },
            {
              "lessThan": "3.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "3.4",
                  "vulnerable": true
                },
                {
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npower: supply: ab8500_fg: fix use-after-free on remove\n\nab8500_fg_remove() destroys the driver workqueue while the threaded\ninterrupt handlers are still armed; they are devm-managed and freed\nonly after -\u003eremove() returns, so a handler that fires in that\nwindow queues work on the freed workqueue.\n\nTear the workqueue down through devm instead, registering its cleanup\nafter the power supply and before the interrupt requests.  devm then\nfrees the interrupts first, so the handlers can no longer queue work,\nbefore disabling the delayed and plain work items and destroying the\nworkqueue.  Disabling the items, rather than cancelling them, keeps\nthem disabled so no producer (including the power-supply\nexternal_power_changed callback) can requeue them.\n\nFound by an in-house static analysis tool."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:52.019Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c2ce9b8f325f522e10e4d262b37ae49deb83e79b"
        },
        {
          "url": "https://git.kernel.org/stable/c/c660c017dec1fd7cd88e1103c5ae1aae6ce636bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/013731074ab6a8d11ec209eee64c5b2656954479"
        },
        {
          "url": "https://git.kernel.org/stable/c/75b1e88d34254f4fb7753345e21bfee47abddd7f"
        }
      ],
      "title": "power: supply: ab8500_fg: fix use-after-free on remove",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89797",
    "datePublished": "2026-09-16T10:30:28.484Z",
    "dateReserved": "2026-09-11T19:38:34.767Z",
    "dateUpdated": "2026-10-19T08:52:52.019Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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