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Linux kernel
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Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Tags
CVE-2024-46683 details
Last Modified : Sept. 13, 2024, 4:52 p.m.
Description
In the Linux kernel, the following vulnerability has been resolved: drm/xe: prevent UAF around preempt fence The fence lock is part of the queue, therefore in the current design anything locking the fence should then also hold a ref to the queue to prevent the queue from being freed. However, currently it looks like we signal the fence and then drop the queue ref, but if something is waiting on the fence, the waiter is kicked to wake up at some later point, where upon waking up it first grabs the lock before checking the fence state. But if we have already dropped the queue ref, then the lock might already be freed as part of the queue, leading to uaf. To prevent this, move the fence lock into the fence itself so we don't run into lifetime issues. Alternative might be to have device level lock, or only release the queue in the fence release callback, however that might require pushing to another worker to avoid locking issues. References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2454 References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2342 References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2020 (cherry picked from commit 7116c35aacedc38be6d15bd21b2fc936eed0008b)
CVSS Score
| 1 | 2 | 3 | 4 | 5 | 6 | 7.8 | 8 | 9 | 10 |
|---|
Weakness
| Weakness | Name | Description |
|---|---|---|
| CWE-416 | Use After Free | Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. |
CVSS Data
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Base Score
7.8
Exploitability Score
1.8
Impact Score
5.9
Base Severity
HIGH
Vector String : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
| URL | Source |
|---|---|
| https://git.kernel.org/stable/c/10081b0b0ed201f53e24bd92deb2e0f3c3e713d4 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
| https://git.kernel.org/stable/c/730b72480e29f63fd644f5fa57c9d46109428953 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
CPEs
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| o | linux | linux_kernel | / | / | / | / | / | / | / | / |
| o | linux | linux_kernel | 6.11 | rc1 | / | / | / | / | / | / |
| o | linux | linux_kernel | 6.11 | rc2 | / | / | / | / | / | / |
| o | linux | linux_kernel | 6.11 | rc3 | / | / | / | / | / | / |
| o | linux | linux_kernel | 6.11 | rc4 | / | / | / | / | / | / |
| o | linux | linux_kernel | 6.11 | rc5 | / | / | / | / | / | / |