CVE-2024-39495

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < 74cd0a421896b2e07eafe7da4275302bfecef201affected
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < 2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83affected
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < fb071f5c75d4b1c177824de74ee75f9dd34123b9affected
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < 9a733d69a4a59c2d08620e6589d823c24be773dcaffected
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < 0b8fba38bdfb848fac52e71270b2aa3538c996eaaffected
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < 03ea2b129344152157418929f06726989efc0445affected
LinuxLinux55742d2a071a569bf20f90d37b1b5b8a25a3f882 < 5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ceaffected
LinuxLinux4.9affected
LinuxLinux0 < 4.9unaffected
LinuxLinux5.4.279 <= 5.4.*unaffected
LinuxLinux5.10.221 <= 5.10.*unaffected
LinuxLinux5.15.162 <= 5.15.*unaffected
LinuxLinux6.1.95 <= 6.1.*unaffected
LinuxLinux6.6.35 <= 6.6.*unaffected
LinuxLinux6.9.6 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References