IM
IronMonkey Threat Research

CVE-2024-35902 MEDIUM

Published: 2024-05-19 | Last Modified: 2026-05-12 | Status: Modified

Description

In the Linux kernel, the following vulnerability has been resolved: net/rds: fix possible cp null dereference cp might be null, calling cp->cp_conn would produce null dereference [Simon Horman adds:] Analysis: * cp is a parameter of __rds_rdma_map and is not reassigned. * The following call-sites pass a NULL cp argument to __rds_rdma_map() - rds_get_mr() - rds_get_mr_for_dest * Prior to the code above, the following assumes that cp may be NULL (which is indicative, but could itself be unnecessary) trans_private = rs->rs_transport->get_mr( sg, nents, rs, &mr->r_key, cp ? cp->cp_conn : NULL, args->vec.addr, args->vec.bytes, need_odp ? ODP_ZEROBASED : ODP_NOT_NEEDED); * The code modified by this patch is guarded by IS_ERR(trans_private), where trans_private is assigned as per the previous point in this analysis. The only implementation of get_mr that I could locate is rds_ib_get_mr() which can return an ERR_PTR if the conn (4th) argument is NULL. * ret is set to PTR_ERR(trans_private). rds_ib_get_mr can return ERR_PTR(-ENODEV) if the conn (4th) argument is NULL. Thus ret may be -ENODEV in which case the code in question will execute. Conclusion: * cp may be NULL at the point where this patch adds a check; this patch does seem to address a possible bug

Additional Descriptions (1)

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/rds: corrige la posible desreferencia nula de cp cp podría ser nulo, llamar a cp->cp_conn produciría una desreferencia nula [Simon Horman agrega:] Análisis: * cp es un parámetro de __rds_rdma_map y no es reasignado. * Los siguientes sitios de llamadas pasan un argumento cp NULL a __rds_rdma_map() - rds_get_mr() - rds_get_mr_for_dest * Antes del código anterior, lo siguiente supone que cp puede ser NULL (lo cual es indicativo, pero podría ser innecesario) trans_private = rs ->rs_transport->get_mr( sg, nents, rs, &mr->r_key, cp ? cp->cp_conn : NULL, args->vec.addr, args->vec.bytes, need_odp ? ODP_ZEROBASED : ODP_NOT_NEEDED); * El código modificado por este parche está custodiado por IS_ERR(trans_private), donde trans_private se asigna según el punto anterior de este análisis. La única implementación de get_mr que pude localizar es rds_ib_get_mr() que puede devolver un ERR_PTR si el argumento conn (cuarto) es NULL. * ret está establecido en PTR_ERR(trans_private). rds_ib_get_mr puede devolver ERR_PTR(-ENODEV) si el argumento de conexión (cuarto) es NULL. Por lo tanto, ret puede ser -ENODEV, en cuyo caso se ejecutará el código en cuestión. Conclusión: * cp puede ser NULL en el punto donde este parche agrega una verificación; este parche parece solucionar un posible error

CVSS Metrics

Base Score: 5.5 (MEDIUM)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactNONE
Integrity ImpactNONE
Availability ImpactHIGH

Source: [email protected]

Type: Primary

Exploitability Score: 1.8

Impact Score: 3.6

Weaknesses

Source Type Description
[email protected] Primary
en CWE-476

Affected Products

Vendor Product Version Update Type
linux linux_kernel * <built-in method update of dict object at 0x7fd36b85ffc0> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd319e51f80> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd368dcc580> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd368d9b080> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd36b167140> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd36b166180> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd3703bacc0> Operating System
linux linux_kernel 6.9 <built-in method update of dict object at 0x7fd2dbd63ac0> Operating System
linux linux_kernel 6.9 <built-in method update of dict object at 0x7fd3703baac0> Operating System
debian debian_linux 10.0 <built-in method update of dict object at 0x7fd368218100> Operating System

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References