CVE-2024-35952
drm/ast: Fix soft lockup
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
drm/ast: Fix soft lockup
There is a while-loop in ast_dp_set_on_off() that could lead to
infinite-loop. This is because the register, VGACRI-Dx, checked in
this API is a scratch register actually controlled by a MCU, named
DPMCU, in BMC.
These scratch registers are protected by scu-lock. If suc-lock is not
off, DPMCU can not update these registers and then host will have soft
lockup due to never updated status.
DPMCU is used to control DP and relative registers to handshake with
host's VGA driver. Even the most time-consuming task, DP's link
training, is less than 100ms. 200ms should be enough.
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: drm/ast: corrige el bloqueo suave. Hay un bucle while en ast_dp_set_on_off() que podría generar un bucle infinito. Esto se debe a que el registro, VGACRI-Dx, marcado en esta API es un registro temporal en realidad controlado por una MCU, denominada DPMCU, en BMC. Estos registros de scratch están protegidos por scu-lock. Si suc-lock no está desactivado, DPMCU no puede actualizar estos registros y luego el host tendrá un bloqueo suave debido a que el estado nunca se actualizó. DPMCU se utiliza para controlar DP y los registros relativos al protocolo de enlace con el controlador VGA del host. Incluso la tarea que consume más tiempo, el entrenamiento de enlaces de DP, dura menos de 100 ms. 200 ms deberían ser suficientes.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-17 CVE Reserved
- 2024-05-20 CVE Published
- 2024-05-21 EPSS Updated
- 2024-09-11 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (7)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2024-35952 | 2024-08-08 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2281938 | 2024-08-08 |
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" | >= 5.19 < 6.1.87 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.1.87" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.19 < 6.6.28 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.6.28" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.19 < 6.8.7 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.8.7" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.19 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.9" | en |
Affected
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