power: supply: pm8916_bms_vm: Fix use-after-free in power_supply_changed()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: power: supply: pm8916_bms_vm: Fix use-after-free in power_supply_changed() Using the `devm_` variant for requesting IRQ before the `devm_` variant for allocating/registering the `power_supply` handle, means that the `power_supply` handle will be deallocated/unregistered before the interrupt handler (since `devm_` naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just after the `power_supply` handle has been freed, but just before the corresponding unregistration of the IRQ handler has run. This will lead to the IRQ handler calling `power_supply_changed()` with a freed `power_supply` handle. Which usually crashes the system or otherwise silently corrupts the memory... Note that there is a similar situation which can also happen during `probe()`; the possibility of an interrupt firing before registering the `power_supply` handle. This would then lead to the nasty situation of using the `power_supply` handle uninitialized in `power_supply_changed()`. Fix this racy use-after-free by making sure the IRQ is requested after the registration of the `power_supply` handle.
Timeline
- CVE published
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
6.7