CVE-2024-49850

In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL referencing a non-existing BTF type, function bpf_core_calc_relo_insn would cause a null pointer deference. Fix this by adding a proper check upper in call stack, as malformed relocation records could be passed from user space. Simplest reproducer is a program: r0 = 0 exit With a single relocation record: .insn_off = 0, /* patch first instruction */ .type_id = 100500, /* this type id does not exist */ .access_str_off = 6, /* offset of string "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL, See the link for original reproducer or next commit for a test case.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708	Patch
https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4	Patch
https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e	Patch
https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f	Patch
https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

22 Oct 2024, 16:12

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: maneja correctamente reubicaciones BPF_CORE_TYPE_ID_LOCAL malformadas En caso de un registro de reubicación malformado del tipo BPF_CORE_TYPE_ID_LOCAL que haga referencia a un tipo BTF inexistente, la función bpf_core_calc_relo_insn causaría una desreferencia de puntero nulo. Solucione esto agregando una verificación superior adecuada en la pila de llamadas, ya que los registros de reubicación malformados podrían pasarse desde el espacio de usuario. El reproductor más simple es un programa: r0 = 0 exit Con un solo registro de reubicación: .insn_off = 0, /* parchear la primera instrucción / .type_id = 100500, / este id de tipo no existe / .access_str_off = 6, / desplazamiento de la cadena "0" */ .kind = BPF_CORE_TYPE_ID_LOCAL, Consulte el enlace para el reproductor original o la próxima confirmación para un caso de prueba.
CWE		CWE-476
First Time		Linux linux Kernel Linux
CPE		cpe:2.3:o:linux:linux_kernel::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
References	~~() https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708 -~~	() https://git.kernel.org/stable/c/2288b54b96dcb55bedebcef3572bb8821fc5e708 - Patch
References	~~() https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4 -~~	() https://git.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4 - Patch
References	~~() https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e -~~	() https://git.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3e - Patch
References	~~() https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f -~~	() https://git.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780f - Patch
References	~~() https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218 -~~	() https://git.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218 - Patch

21 Oct 2024, 13:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-10-21 13:15

Updated : 2024-10-22 16:12

NVD link : CVE-2024-49850

Mitre link : CVE-2024-49850

CVE.ORG link : CVE-2024-49850

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-476

NULL Pointer Dereference

5.5 /10