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CVE-2024-35902

Disclosure Date: May 19, 2024 •
CVE-2024-35902
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

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

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CVSS V3 Severity and Metrics
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Impact Score:
Unknown
Exploitability Score:
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Vector:
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Attack Vector (AV):
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Attack Complexity (AC):
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Privileges Required (PR):
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User Interaction (UI):
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux d275de8ea7be
Linux bcd46782e2ec
Linux cfb786b03b03
Linux d49fac38479b
Linux cbaac2e5488e
Linux 92309bed3c5f
Linux 6794090c7420
Linux not down converted
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • Linux

Products

  • Linux
Technical Analysis