Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: regulator: core: fix use_count leakage when handling boot-on I found a use_count leakage towards supply regulator of rdev with boot-on option. ┌───────────────────┐ ┌───────────────────┐ │ regulator_dev A │ │ regulator_dev B │ │ (boot-on) │ │ (boot-on) │ │ use_count=0 │◀──supply──│ use_count=1 │ │ │ │ │ └───────────────────┘ └───────────────────┘ In case of rdev(A) configured with `regulator-boot-on', the use_count of supplying regulator(B) will increment inside regulator_enable(rdev->supply). Thus, B will acts like always-on, and further balanced regulator_enable/disable cannot actually disable it anymore. However, B was also configured with `regulator-boot-on', we wish it could be disabled afterwards.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected dc1b1d7faf616ed663d0bba9be5abb4d1ed35d01 before dc3391d49479bc2bf8a2b88dbf86fdd800882fee; affected f44b07472f29ae313ce875dc7b9c75b100c608b8 before 5bfc53df288e8ea54ca6866fb92034214940183f; affected 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b before 4b737246ff50f810d6ab4be13c1388a07f0c14b1; affected 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b before feb847e6591e8c7a09cc39721cc9ca74fd9a5d80; affected 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b before 4dd6e1cc9c7403f1ee1b7eee85bc31b797ae8347; affected 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b before bc6c381df5793ebcf32db88a3e65acf7870379fc; affected 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b before 0591b14ce0398125439c759f889647369aa616a0; affected 4.19.226 before 4.19.270; affected 5.4.7 before 5.4.229 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 4.19.270 through 4.19.*; unaffected 5.4.229 through 5.4.*; unaffected 5.10.163 through 5.10.*; unaffected 5.15.86 through 5.15.*; unaffected 6.0.16 through 6.0.*; unaffected 6.1.2 through 6.1.*; unaffected 6.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dc3391d49479bc2bf8a2b88dbf86fdd800882fee
- https://git.kernel.org/stable/c/5bfc53df288e8ea54ca6866fb92034214940183f
- https://git.kernel.org/stable/c/4b737246ff50f810d6ab4be13c1388a07f0c14b1
- https://git.kernel.org/stable/c/feb847e6591e8c7a09cc39721cc9ca74fd9a5d80
- https://git.kernel.org/stable/c/4dd6e1cc9c7403f1ee1b7eee85bc31b797ae8347
- https://git.kernel.org/stable/c/bc6c381df5793ebcf32db88a3e65acf7870379fc
- https://git.kernel.org/stable/c/0591b14ce0398125439c759f889647369aa616a0