Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < c549dd3de4b3f6e726d1b8386d40ccf7d3abdbe4affected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < 3ff75cba1c98349a23a8f9333981deba1972cc11affected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < 2ce2334be155bd8bad6377e99984246ce4dbd08caffected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < cbb9b07f88a9ef6518934c41eb3e8cf840d657d5affected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < f3fbe309c9bfe1aac1e2b26543e9dc4829f3275aaffected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < 2841bbb5a35c4449c0a0458e8e476b2a62f95147affected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < e261be6f18929f2397cd54cd583a2df624c129c1affected874b2adbed1253a11549cb9b7b912ab65fea9cf2 to < 642f33e34b969eedec334738fd5df95d2dc42742affected
Linux Linux
Default version status: affected
4.13affected0 to < 4.13unaffected5.10.252 to ≤ 5.10.*unaffected5.15.202 to ≤ 5.15.*unaffected6.1.165 to ≤ 6.1.*unaffected6.6.128 to ≤ 6.6.*unaffected6.12.75 to ≤ 6.12.*unaffected6.18.14 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
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 ↗