CVE-2026-89797

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/013731074ab6a8d11ec209eee64c5b2656954479
https://git.kernel.org/stable/c/75b1e88d34254f4fb7753345e21bfee47abddd7f
https://git.kernel.org/stable/c/c660c017dec1fd7cd88e1103c5ae1aae6ce636bf

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-16 11:16

Updated : 2026-09-16 11:16

NVD link : CVE-2026-89797

Mitre link : CVE-2026-89797

CVE.ORG link : CVE-2026-89797

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89797", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "13151631b5bd06a1511353bb221079bbd76606c3", "lessThan": "c660c017dec1fd7cd88e1103c5ae1aae6ce636bf", "versionType": "git"}, {"status": "affected", "version": "13151631b5bd06a1511353bb221079bbd76606c3", "lessThan": "013731074ab6a8d11ec209eee64c5b2656954479", "versionType": "git"}, {"status": "affected", "version": "13151631b5bd06a1511353bb221079bbd76606c3", "lessThan": "75b1e88d34254f4fb7753345e21bfee47abddd7f", "versionType": "git"}], "programFiles": ["drivers/power/supply/ab8500_fg.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.4"}, {"status": "unaffected", "version": "0", "lessThan": "3.4", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.51", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.5", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/power/supply/ab8500_fg.c"], "defaultStatus": "affected"}]}], "published": "2026-09-16T11:16:44.547", "references": [{"url": "https://git.kernel.org/stable/c/013731074ab6a8d11ec209eee64c5b2656954479", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/75b1e88d34254f4fb7753345e21bfee47abddd7f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c660c017dec1fd7cd88e1103c5ae1aae6ce636bf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "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 ->remove() 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."}], "lastModified": "2026-09-16T11:16:44.547", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}