CVE-2024-39495
In the Linux kernel, the following vulnerability has been resolved: greybus: Fix use-after-free bug in gb_interface_release due to race condition.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.33% probability · 25th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/03ea2b129344152157418929f06726989efc0445Patch
- https://git.kernel.org/stable/c/0b8fba38bdfb848fac52e71270b2aa3538c996eaPatch
- https://git.kernel.org/stable/c/2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83Patch
- https://git.kernel.org/stable/c/5c9c5d7f26acc2c669c1dcf57d1bb43ee99220cePatch
- https://git.kernel.org/stable/c/74cd0a421896b2e07eafe7da4275302bfecef201Patch
- https://git.kernel.org/stable/c/9a733d69a4a59c2d08620e6589d823c24be773dcPatch
- https://git.kernel.org/stable/c/fb071f5c75d4b1c177824de74ee75f9dd34123b9Patch
- https://git.kernel.org/stable/c/03ea2b129344152157418929f06726989efc0445Patch
- https://git.kernel.org/stable/c/0b8fba38bdfb848fac52e71270b2aa3538c996eaPatch
- https://git.kernel.org/stable/c/2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83Patch
- https://git.kernel.org/stable/c/5c9c5d7f26acc2c669c1dcf57d1bb43ee99220cePatch
- https://git.kernel.org/stable/c/74cd0a421896b2e07eafe7da4275302bfecef201Patch
- https://git.kernel.org/stable/c/9a733d69a4a59c2d08620e6589d823c24be773dcPatch
- https://git.kernel.org/stable/c/fb071f5c75d4b1c177824de74ee75f9dd34123b9Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.