CVE-2024-39495: greybus: Fix use-after-free bug in gb_interface_release due to race condition.
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: greybus: Fix use-after-free bug in gb_interface_release due to race condition. In gb_interface_create, &intf->mode_switch_completion is bound with gb_interface_mode_switch_work. Then it will be started by gb_interface_request_mode_switch. Here is the relevant code. if (!queue_work(system_long_wq, &intf->mode_switch_work)) { ... } If we call gb_interface_release to make cleanup, there may be an unfinished work. This function will call kfree to free the object "intf". However, if gb_interface_mode_switch_work is scheduled to run after kfree, it may cause use-after-free error as gb_interface_mode_switch_work will use the object "intf". The possible execution flow that may lead to the issue is as follows: CPU0 CPU1 | gb_interface_create | gb_interface_request_mode_switch gb_interface_release | kfree(intf) (free) | | gb_interface_mode_switch_work | mutex_lock(&intf->mutex) (use) Fix it by canceling the work before kfree.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <5.4.279 | |
| Linux Linux kernel | >=5.5<5.10.221 | |
| Linux Linux kernel | >=5.11<5.15.162 | |
| Linux Linux kernel | >=5.16<6.1.95 | |
| Linux Linux kernel | >=6.2<6.6.35 | |
| Linux Linux kernel | >=6.7<6.9.6 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/03ea2b129344152157418929f06726989efc0445
- https://git.kernel.org/stable/c/0b8fba38bdfb848fac52e71270b2aa3538c996ea
- https://git.kernel.org/stable/c/2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83
- https://git.kernel.org/stable/c/5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce
- https://git.kernel.org/stable/c/74cd0a421896b2e07eafe7da4275302bfecef201
- https://git.kernel.org/stable/c/9a733d69a4a59c2d08620e6589d823c24be773dc
- https://git.kernel.org/stable/c/fb071f5c75d4b1c177824de74ee75f9dd34123b9
- https://git.kernel.org/linus/5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce
- https://security-tracker.debian.org/tracker/CVE-2024-39495
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-39495
- https://nvd.nist.gov/vuln/detail/CVE-2024-39495
- https://launchpad.net/bugs/cve/CVE-2024-39495
- https://ubuntu.com/security/CVE-2024-39495
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