Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: power: supply: cpcap-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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before c549dd3de4b3f6e726d1b8386d40ccf7d3abdbe4; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before 3ff75cba1c98349a23a8f9333981deba1972cc11; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before 2ce2334be155bd8bad6377e99984246ce4dbd08c; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before cbb9b07f88a9ef6518934c41eb3e8cf840d657d5; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before f3fbe309c9bfe1aac1e2b26543e9dc4829f3275a; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before 2841bbb5a35c4449c0a0458e8e476b2a62f95147; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before e261be6f18929f2397cd54cd583a2df624c129c1; affected 874b2adbed1253a11549cb9b7b912ab65fea9cf2 before 642f33e34b969eedec334738fd5df95d2dc42742 |
| Linux / Linux | affected 4.13; unaffected 0 before 4.13; 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/c549dd3de4b3f6e726d1b8386d40ccf7d3abdbe4
- https://git.kernel.org/stable/c/3ff75cba1c98349a23a8f9333981deba1972cc11
- https://git.kernel.org/stable/c/2ce2334be155bd8bad6377e99984246ce4dbd08c
- https://git.kernel.org/stable/c/cbb9b07f88a9ef6518934c41eb3e8cf840d657d5
- https://git.kernel.org/stable/c/f3fbe309c9bfe1aac1e2b26543e9dc4829f3275a
- https://git.kernel.org/stable/c/2841bbb5a35c4449c0a0458e8e476b2a62f95147
- https://git.kernel.org/stable/c/e261be6f18929f2397cd54cd583a2df624c129c1
- https://git.kernel.org/stable/c/642f33e34b969eedec334738fd5df95d2dc42742