CVE-2025-38175: binder: fix yet another UAF in binder_devices
In the Linux kernel, the following vulnerability has been resolved:
binder: fix yet another UAF in binderdevices
Commit e77aff5528a18 ("binderfs: fix use-after-free in binderdevices") addressed a use-after-free where devices could be released without first being removed from the binderdevices list. However, there is a similar path in binderfreeproc() that was missed:
================================================================== BUG: KASAN: slab-use-after-free in binderremovedevice+0xd4/0x100 Write of size 8 at addr ffff0000c773b900 by task umount/467 CPU: 12 UID: 0 PID: 467 Comm: umount Not tainted 6.15.0-rc7-00138-g57483a362741 #9 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: binderremovedevice+0xd4/0x100 binderfsevictinode+0x230/0x2f0 evict+0x25c/0x5dc iput+0x304/0x480 dentryunlinkinode+0x208/0x46c dentrykill+0x154/0x530 [...]
Allocated by task 463: kmalloccachenoprof+0x13c/0x324 binderfsbinderdevicecreate.isra.0+0x138/0xa60 binderctlioctl+0x1ac/0x230 [...]
Freed by task 215: kfree+0x184/0x31c binderprocdectmpref+0x33c/0x4ac binderdeferredfunc+0xc10/0x1108 processonework+0x520/0xba4 [...] ==================================================================
Call binderremovedevice() within binderfreeproc() to ensure the device is removed from the binderdevices list before being kfreed.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch e77aff5528a18
Event History
Frequently Asked Questions
What is the severity of CVE-2025-38175?
CVE-2025-38175 has been classified as a medium severity vulnerability due to its potential impact on system stability.
How do I fix CVE-2025-38175?
To fix CVE-2025-38175, upgrade your Linux kernel to the latest version where the use-after-free issue in binder_devices has been addressed.
What systems are affected by CVE-2025-38175?
CVE-2025-38175 affects the Linux kernel, specifically systems utilizing binder devices.
What type of vulnerability is CVE-2025-38175?
CVE-2025-38175 is a use-after-free vulnerability that occurs in binder_devices.
Is there a patch for CVE-2025-38175?
Yes, a patch has been implemented in the latest Linux kernel release to address CVE-2025-38175.