Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: power: supply: sbs-battery: 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. Keep the old behavior of just printing a warning in case of any failures during the IRQ request and finishing the probe successfully.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d2cec82c28802da31596b395ad292cb8f132fd63 before ca7dd71773e4e050b0fb98768b7eae60f8d1f38b; affected d2cec82c28802da31596b395ad292cb8f132fd63 before f1f472b14ad56104ba228b8fbec60d5b21829913; affected d2cec82c28802da31596b395ad292cb8f132fd63 before 8010b745b436c3e1ca5dd960aa29fa3e0f6d8841; affected d2cec82c28802da31596b395ad292cb8f132fd63 before 2078830c32d1e49ac942c6f8c21f35c806ae5e94; affected d2cec82c28802da31596b395ad292cb8f132fd63 before 82d3eb97a976c9d56bb92b241397610e57a9c629; affected d2cec82c28802da31596b395ad292cb8f132fd63 before 861dda7a9074c0ff67788928165ae39d7f647491; affected d2cec82c28802da31596b395ad292cb8f132fd63 before 14d4dee5d8fb361bfff275832087254beab66d72; affected d2cec82c28802da31596b395ad292cb8f132fd63 before 8d59cf3887fbabacef53bfba473e33e8a8d9d07b |
| Linux / Linux | affected 4.9; unaffected 0 before 4.9; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ca7dd71773e4e050b0fb98768b7eae60f8d1f38b
- https://git.kernel.org/stable/c/f1f472b14ad56104ba228b8fbec60d5b21829913
- https://git.kernel.org/stable/c/8010b745b436c3e1ca5dd960aa29fa3e0f6d8841
- https://git.kernel.org/stable/c/2078830c32d1e49ac942c6f8c21f35c806ae5e94
- https://git.kernel.org/stable/c/82d3eb97a976c9d56bb92b241397610e57a9c629
- https://git.kernel.org/stable/c/861dda7a9074c0ff67788928165ae39d7f647491
- https://git.kernel.org/stable/c/14d4dee5d8fb361bfff275832087254beab66d72
- https://git.kernel.org/stable/c/8d59cf3887fbabacef53bfba473e33e8a8d9d07b