| Summary: |
VUL-0: CVE-2024-39495: kernel: greybus: fix use-after-free bug in gb_interface_release due to race condition |
| Product: |
[Novell Products] SUSE Security Incidents
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Reporter: |
SMASH SMASH <smash_bz> |
| Component: |
Incidents | Assignee: |
Security Team bot <security-team> |
| Status: |
RESOLVED
INVALID
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QA Contact: |
Security Team bot <security-team> |
| Severity: |
Normal
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| Priority: |
P3 - Medium
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CC: |
camila.matos, mhocko
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| Version: |
unspecified | |
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| Target Milestone: |
--- | |
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| Hardware: |
Other | |
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| OS: |
Other | |
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| URL: |
https://smash.suse.de/issue/413810/
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| Whiteboard: |
CVSSv3.1:SUSE:CVE-2024-39495:5.8:(AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H) |
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Found By:
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Security Response Team
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Services Priority:
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Business Priority:
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Blocker:
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---
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Marketing QA Status:
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IT Deployment:
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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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-39495 https://www.cve.org/CVERecord?id=CVE-2024-39495 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