CVE-2024-35902

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux786854141057751bc08eb26f1b02e97c1631c8f4 < d275de8ea7be3a453629fddae41d4156762e814caffected
LinuxLinux997efea2bf3a4adb96c306b9ad6a91442237bf5b < bcd46782e2ec3825d10c1552fcb674d491cc09f9affected
LinuxLinux9dfc15a10dfd44f8ff7f27488651cb5be6af83c2 < cfb786b03b03c5ff38882bee38525eb9987e4d14affected
LinuxLinuxb562ebe21ed9adcf42242797dd6cb75beef12bf0 < d49fac38479bfdaec52b3ea274d290c47a294029affected
LinuxLinux998fd719e6d6468b930ac0c44552ea9ff8b07b80 < cbaac2e5488ed54833897264a5ffb2a341a9f196affected
LinuxLinux2b505d05280739ce31d5708da840f42df827cb85 < 92309bed3c5fbe2ccd4c45056efd42edbd06162daffected
LinuxLinuxc055fc00c07be1f0df7375ab0036cebd1106ed38 < 6794090c742008c53b344b35b021d4a3093dc50aaffected
LinuxLinuxc055fc00c07be1f0df7375ab0036cebd1106ed38 < 62fc3357e079a07a22465b9b6ef71bb6ea75ee4baffected
LinuxLinux907761307469adecb02461a14120e9a1812a5fb1affected
LinuxLinux4.19.310 < 4.19.312affected
LinuxLinux5.4.272 < 5.4.274affected
LinuxLinux5.10.213 < 5.10.215affected
LinuxLinux5.15.152 < 5.15.154affected
LinuxLinux6.1.82 < 6.1.85affected
LinuxLinux6.6.22 < 6.6.26affected
LinuxLinux6.7.10 < 6.8affected
LinuxLinux6.8affected
LinuxLinux0 < 6.8unaffected
LinuxLinux4.19.312 <= 4.19.*unaffected
LinuxLinux5.4.274 <= 5.4.*unaffected
LinuxLinux5.10.215 <= 5.10.*unaffected
LinuxLinux5.15.154 <= 5.15.*unaffected
LinuxLinux6.1.85 <= 6.1.*unaffected
LinuxLinux6.6.26 <= 6.6.*unaffected
LinuxLinux6.8.5 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

Additional References

References