CVE-2024-46683
drm/xe: prevent UAF around preempt fence
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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 Scores
SSVC
- Decision:Track
Timeline
- 2024-09-11 CVE Reserved
- 2024-09-13 CVE Published
- 2024-09-14 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (3)
URL | Tag | Source |
---|---|---|
https://git.kernel.org/stable/c/dd08ebf6c3525a7ea2186e636df064ea47281987 | Vuln. Introduced |
URL | Date | SRC |
---|
URL | Date | SRC |
---|---|---|
https://git.kernel.org/stable/c/10081b0b0ed201f53e24bd92deb2e0f3c3e713d4 | 2024-09-04 | |
https://git.kernel.org/stable/c/730b72480e29f63fd644f5fa57c9d46109428953 | 2024-08-19 |
URL | Date | SRC |
---|
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.8 < 6.10.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.8 < 6.10.8" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.8 < 6.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.8 < 6.11" | en |
Affected
|