cbcvebase.
CVE-2024-35902
published 2024-05-19

CVE-2024-35902: 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…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.22%
12.7th percentile
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

33 ranges· showing 25
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.85-1 (bookworm)linux 6.1.85-1 (bookworm)
linuxlinux
linuxlinux
linuxlinux>= 2b505d05280739ce31d5708da840f42df827cb85 < 92309bed3c5fbe2ccd4c45056efd42edbd06162d92309bed3c5fbe2ccd4c45056efd42edbd06162d
linuxlinux>= 4.19.310 < 4.19.3124.19.312
linuxlinux>= 5.10.213 < 5.10.2155.10.215
linuxlinux>= 5.15.152 < 5.15.1545.15.154
linuxlinux>= 5.4.272 < 5.4.2745.4.274
linuxlinux>= 6.1.82 < 6.1.856.1.85
linuxlinux>= 6.6.22 < 6.6.266.6.26
linuxlinux>= 6.7.10 < 6.86.8
linuxlinux>= 786854141057751bc08eb26f1b02e97c1631c8f4 < d275de8ea7be3a453629fddae41d4156762e814cd275de8ea7be3a453629fddae41d4156762e814c
linuxlinux>= 997efea2bf3a4adb96c306b9ad6a91442237bf5b < bcd46782e2ec3825d10c1552fcb674d491cc09f9bcd46782e2ec3825d10c1552fcb674d491cc09f9
linuxlinux>= 998fd719e6d6468b930ac0c44552ea9ff8b07b80 < cbaac2e5488ed54833897264a5ffb2a341a9f196cbaac2e5488ed54833897264a5ffb2a341a9f196
linuxlinux>= 9dfc15a10dfd44f8ff7f27488651cb5be6af83c2 < cfb786b03b03c5ff38882bee38525eb9987e4d14cfb786b03b03c5ff38882bee38525eb9987e4d14
linuxlinux>= b562ebe21ed9adcf42242797dd6cb75beef12bf0 < d49fac38479bfdaec52b3ea274d290c47a294029d49fac38479bfdaec52b3ea274d290c47a294029
linuxlinux>= c055fc00c07be1f0df7375ab0036cebd1106ed38 < 6794090c742008c53b344b35b021d4a3093dc50a6794090c742008c53b344b35b021d4a3093dc50a
linuxlinux>= c055fc00c07be1f0df7375ab0036cebd1106ed38 < 62fc3357e079a07a22465b9b6ef71bb6ea75ee4b62fc3357e079a07a22465b9b6ef71bb6ea75ee4b
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.216-15.10.216-1
linuxlinux_kernel>= 0 < 6.1.85-16.1.85-1
linuxlinux_kernel>= 0 < 6.8.9-16.8.9-1
linuxlinux_kernel>= 0 < 6.8.9-16.8.9-1
linuxlinux_kernel>= 0 < 5.15.0-116.1265.15.0-116.126

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv6.8MEDIUM
vendor_ubuntu6.3MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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