// For flags

CVE-2024-26710

powerpc/kasan: Limit KASAN thread size increase to 32KB

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

powerpc/kasan: Limit KASAN thread size increase to 32KB

KASAN is seen to increase stack usage, to the point that it was reported
to lead to stack overflow on some 32-bit machines (see link).

To avoid overflows the stack size was doubled for KASAN builds in
commit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase with
KASAN").

However with a 32KB stack size to begin with, the doubling leads to a
64KB stack, which causes build errors:
arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff)

Although the asm could be reworked, in practice a 32KB stack seems
sufficient even for KASAN builds - the additional usage seems to be in
the 2-3KB range for a 64-bit KASAN build.

So only increase the stack for KASAN if the stack size is < 32KB.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: powerpc/kasan: limitar el aumento del tamaño del subproceso KASAN a 32 KB. Se considera que KASAN aumenta el uso de la pila, hasta el punto de que se informó que provoca un desbordamiento de la pila en algunas máquinas de 32 bits ( ver enlace). Para evitar desbordamientos, el tamaño de la pila se duplicó para las compilaciones de KASAN en el commit 3e8635fb2e07 ("powerpc/kasan: Forzar el aumento del tamaño del subproceso con KASAN"). Sin embargo, con un tamaño de pila de 32 KB para empezar, la duplicación conduce a una pila de 64 KB, lo que provoca errores de compilación: arch/powerpc/kernel/switch.S:249: Error: operando fuera de rango (0x000000000000fe50 no está entre 0xffffffffffff8000 y 0x00000000000007fff) Aunque el conjunto podría modificarse, en la práctica una pila de 32 KB parece suficiente incluso para compilaciones KASAN; el uso adicional parece estar en el rango de 2 a 3 KB para una compilación KASAN de 64 bits. Por lo tanto, solo aumente la pila para KASAN si el tamaño de la pila es &lt;32 KB.

*Credits: N/A
CVSS Scores
Attack Vector
-
Attack Complexity
-
Privileges Required
-
User Interaction
-
Scope
-
Confidentiality
-
Integrity
-
Availability
-
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-19 CVE Reserved
  • 2024-04-03 CVE Published
  • 2024-04-04 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
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"
>= 6.1.75 < 6.1.79
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1.75 < 6.1.79"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.6.14 < 6.6.18
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6.14 < 6.6.18"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.7.2 < 6.7.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.7.2 < 6.7.6"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
6.1.76
Search vendor "Linux" for product "Linux Kernel" and version "6.1.76"
en
Affected