CVE-2026-89474: Linux kernel · power: supply: bq256xx: drain usb_work before freeing the charger
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 15:59 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel source code that corrects the order of resource release and notifier unregistration to prevent use-after-free. Users should update to the fixed kernel version once available. No additional mitigation is indicated.
Description
In the Linux kernel, the following vulnerability has been resolved: power: supply: bq256xx: drain usb_work before freeing the charger The USB-PHY notifier queues usb_work, whose handler calls power_supply_changed(bq->charger). The reset devm action only unregisters the notifier and was registered before the power supplies, so devm frees bq->charger on unwind before the action runs; a usb_work still queued can then dereference it. Register the reset action after the power supplies, so it unregisters the notifiers and drains usb_work before the supplies are released. Initialize usb_work and obtain the PHY references before registering the notifiers, so the worker cannot run before the supplies exist. Found by static analysis.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89474 (opens in a new tab)
- git.kernel.org/stable/c/2dd6cd823777bea6d9a880a12a92a73ec76aee0b (opens in a new tab)
- git.kernel.org/stable/c/9a467bd1e6811011026ad4c8de701b940d88a00c (opens in a new tab)
- git.kernel.org/stable/c/9e1aba34df9a87d53460888e05718717c0f69343 (opens in a new tab)
- git.kernel.org/stable/c/c8addb842ae8dcf69c15fc976e33e3bd538a41d7 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89474.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)
- ubuntu.com/security/CVE-2026-89474 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89474 (opens in a new tab)
- git.kernel.org/linus/2dd6cd823777bea6d9a880a12a92a73ec76aee0b (opens in a new tab)