CVE-2024-35902
net/rds: fix possible cp null dereference
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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
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 Scores
SSVC
- Decision:Track
Timeline
- 2024-05-17 CVE Reserved
- 2024-05-19 CVE Published
- 2024-05-20 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (18)
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19.310 < 4.19.312 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.310 < 4.19.312" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.4.272 < 5.4.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.272 < 5.4.274" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.10.213 < 5.10.215 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10.213 < 5.10.215" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.15.152 < 5.15.154 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15.152 < 5.15.154" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.1.82 < 6.1.85 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.1.82 < 6.1.85" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.6.22 < 6.6.26 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.6.22 < 6.6.26" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.8 < 6.8.5 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.8 < 6.8.5" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.8 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.8 < 6.9" | en |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 6.7.10 Search vendor "Linux" for product "Linux Kernel" and version "6.7.10" | en |
Affected
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