UBUNTU-CVE-2024-49876
In the Linux kernel, the following vulnerability has been resolved: drm/xe: fix UAF around queue destruction We currently do stuff like queuing the final destruction step on a random system wq, which will outlive the driver instance. With bad timing we can teardown the driver with one or more work workqueue still being alive leading to various UAF splats. Add a fini step to ensure user queues are properly torn down. At this point GuC should already be nuked so queue itself should no longer be referenced from hw pov. v2 (Matt B) - Looks much safer to use a waitqueue and then just wait for the xa_array to become empty before triggering the drain. (cherry picked from commit 861108666cc0e999cffeab6aff17b662e68774e3)
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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13 explicit affected versions
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26 explicit affected versions
37 explicit affected versions
21 explicit affected versions
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38 explicit affected versions
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11 explicit affected versions
7 explicit affected versions
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13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
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14 explicit affected versions
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11 explicit affected versions
1 explicit affected versions
12 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: drm/xe: fix UAF around queue destruction We currently do stuff like queuing the final destruction step on a random system wq, which will outlive the driver instance. With bad timing we can teardown the driver with one or more work workqueue still being alive leading to various UAF splats. Add a fini step to ensure user queues are properly torn down. At this point GuC should already be nuked so queue itself should no longer be referenced from hw pov. v2 (Matt B) - Looks much safer to use a waitqueue and then just wait for the xa_array to become empty before triggering the drain. (cherry picked from commit 861108666cc0e999cffeab6aff17b662e68774e3)
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/2d2be279f1ca9e7288282d4214f16eea8a727cdb
- https://git.kernel.org/stable/c/272b0e78874586d6ccae04079d75b27b47705544
- https://git.kernel.org/stable/c/2d2be279f1ca9e7288282d4214f16eea8a727cdb
- https://git.kernel.org/stable/c/421c74670b0f9d5c007f1276d3647aa58f407fde
- https://ubuntu.com/security/CVE-2024-49876
- https://ubuntu.com/security/notices/USN-7276-1
- https://ubuntu.com/security/notices/USN-7277-1
- https://ubuntu.com/security/notices/USN-7301-1
- https://ubuntu.com/security/notices/USN-7303-1
- https://ubuntu.com/security/notices/USN-7303-2
- https://ubuntu.com/security/notices/USN-7303-3
- https://ubuntu.com/security/notices/USN-7304-1
- https://ubuntu.com/security/notices/USN-7310-1
- https://ubuntu.com/security/notices/USN-7311-1
- https://ubuntu.com/security/notices/USN-7384-1
- https://ubuntu.com/security/notices/USN-7384-2
- https://ubuntu.com/security/notices/USN-7385-1
- https://ubuntu.com/security/notices/USN-7386-1
- https://ubuntu.com/security/notices/USN-7403-1
- https://www.cve.org/CVERecord?id=CVE-2024-49876