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CVE-2026-89469
power: supply: lp8727: fix use-after-free in lp8727_release_irq()
Published 2026-09-11 (37 days ago) by the Linux kernel CNA. Subsystem drivers/power. Debian urgency: not yet assigned.
Debian does not build this code. The per-release build detail is under "Where it lives" below.
What to do, per Debian release
Debian's own status for CVE-2026-89469 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source
| Release | Status | Version | What this means |
|---|---|---|---|
| Debian 12bookworm | fixedDLA-4841-1 · 2026-10-17 · text | 6.1.190-1 | Update the kernel and reboot. DLA-4841-1 shipped the fix on 2026-10-17, in 6.1.190-1. A running kernel keeps the old code until the machine restarts. |
| Debian 13trixie | fixedDSA-6528-1 · 2026-09-29 · text | 6.12.111-1 | Update the kernel and reboot. DSA-6528-1 shipped the fix on 2026-09-29, in 6.12.111-1. A running kernel keeps the old code until the machine restarts. |
| Debian 14forky | fixed | 7.2.6-1 | Update the kernel and reboot. Fixed in 7.2.6-1. A running kernel keeps the old code until the machine restarts. |
| Debian unstablesid | fixed | 7.2.6-1 | Update the kernel and reboot. Fixed in 7.2.6-1. A running kernel keeps the old code until the machine restarts. |
| Debian 12bookworm · linux-6.12 | fixedDLA-4817-1 · 2026-10-04 · text | 6.12.111-1~deb12u1 | Update the kernel and reboot. DLA-4817-1 shipped the fix on 2026-10-04, in 6.12.111-1~deb12u1. A running kernel keeps the old code until the machine restarts. |
The vulnerability
What the bug is
lp8727_isr_func(), the threaded IRQ handler, is the only caller that arms pchg->work via schedule_delayed_work(). lp8727_release_irq() currently cancels the work before freeing the IRQ, so an IRQ delivered in between can re-arm the work through the threaded handler. After .remove returns the devm layer frees pchg while lp8727_delayed_func() may still run and dereference it. Free the IRQ first so the threaded handler is quiesced and can no longer queue work, then cancel the delayed work to drain the final generation. This issue was found by an in-house static analysis tool.
Where it lives
The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.
drivers/power/supply/lp8727_charger.c
- What this is
- POWER SUPPLY CLASS/SUBSYSTEM and DRIVERSMAINTAINERS section matched on drivers/power/supply/ · linux-pm@vger.kernel.org · Maintained
- Kernel module
- none to look for. The file would have gone into lp8727_charger, and Debian does not compile it into that module, so finding lp8727_charger in lsmod would say nothing about this CVE.
Check it on the machine
grep -wE 'CONFIG_CHARGER_LP8727|CONFIG_POWER_SUPPLY' /boot/config-$(uname -r)Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.
Show whether Debian builds this, per release
Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.
- bookworm, trixie, forky, sid, bookworm · linux-6.12n
- n
- not enabled on any flavour - this release does not build the code
- Build switches
- CONFIG_CHARGER_LP8727, CONFIG_POWER_SUPPLY
- Reads as
- all on means the file is compiled; any one off means it is not.
From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages
Signals
- Published
- 2026-09-11 (37 days ago)source
- CVSS
- 8.4 high
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsource recompute it - Attack vector
- local (AV:L)source
- EPSS
- 0.14%, higher than 2.8% of all CVEssource
- CISA KEV
- not listedthe KEV catalogue
- Debian urgency
- not yet assignedsource
- Subsystem
- drivers/power
Upstream fixes
The versions the CNA records as introducing and fixing this, and the commit for each. source
| Introduced | Fixed in | Commit |
|---|---|---|
| 3.7 | 5.10.270 | 1321a4e62471 |
| 3.7 | 5.15.221 | dc1dc2837f8e |
| 3.7 | 6.1.188 | 035cc6bc4d41 |
| 3.7 | 6.6.157 | 6f0ce09d60a0 |
| 3.7 | 6.12.109 | 80d4e40a85ba |
| 3.7 | 6.18.50 | ab6b1ad710be |
| 3.7 | 7.2.4 | 6ab3128292df |
| 3.7 | 7.3 | ceb6ac43b0f5 |
Debian advisories
| Advisory | Date | Shipped to | Debian |
|---|---|---|---|
| DLA-4841-1 | 2026-10-17 | bookworm 6.1.190-1 | tracker |
| DLA-4817-1 | 2026-10-04 | bookworm 6.12.111-1~deb12u1 | tracker |
| DSA-6528-1 | 2026-09-29 | trixie 6.12.111-1 | tracker |
Why the CNA scored it this way
Quoted from the kernel CNA's own scoring file, word for word. A highlighted metric carries the most severe value CVSS v3.1 defines for it, which is what pushes the score up. source
- AV:LAttack vector, local
- The UAF is reached only when the onboard I2C LP8727 Micro/Mini USB charger is torn down locally (sysfs unbind, rmmod, or shutdown/reboot) so lp8727_delayed_func() runs after devm frees pchg; IRQs come from the chip INT GPIO, not from any network protocol.
- AC:LAttack complexity, low
- The attacker controls both sides of the race: they start teardown while USB plug/unplug IRQs re-arm pchg->work after cancel_delayed_work_sync() and before free_irq(); the 270ms debounce then runs lp8727_delayed_func() on already-freed memory, so the UAF is retriable rather than layout-dependent.
- PR:NPrivileges required, none
- On battery-powered devices with this USB charger IC, brief physical possession is enough to force power-off/reboot with no Linux account while charger IRQs fire during remove, as for the prior RT9455 teardown UAFs (CVE-2026-46270, CVE-2026-89465); CAP_SYS_ADMIN unbind is only an alternate path.
- UI:NUser interaction, none
- No victim action is required; the attacker performs teardown and any charging-port manipulation themselves, without the victim opening files, mounting filesystems, or approving prompts.
- S:UScope, unchanged
- The UAF corrupts kernel heap inside the same OS security authority; it is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.
- C:HConfidentiality impact, high
- lp8727_delayed_func() recovers the freed lp8727_chg via container_of() and reads client, lock, pdata, and psy pointers, a classic kernel heap UAF that enables arbitrary disclosure via slab reuse.
- I:HIntegrity impact, high
- The same callback writes pchg fields, issues I2C SMBus writes, and calls power_supply_changed() on freed ac/usb/batt objects (changed flag and schedule_work), enabling heap-spray arbitrary writes and control-flow hijack.
- A:HAvailability impact, high
- Use-after-free of pchg and the unregistered power_supply objects from workqueue context causes a kernel oops or panic even when the UAF is not fully exploited.