CVE-2024-35902: net/rds: fix possible cp null dereference
First published: Sun May 19 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.19.310<4.19.312 | |
| Linux Kernel | >=5.4.272<5.7.274 | |
| Linux Kernel | >=5.10.213<5.10.215 | |
| Linux Kernel | >=5.15.152<5.15.154 | |
| Linux Kernel | >=6.1.82<6.1.85 | |
| Linux Kernel | >=6.6.22<6.6.26 | |
| Linux Kernel | >=6.7.10<6.8.5 | |
| Linux Kernel | =6.9-rc1 | |
| Linux Kernel | =6.9-rc2 | |
| Debian Linux | =10.0 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 |
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Reference Links
- https://git.kernel.org/stable/c/62fc3357e079a07a22465b9b6ef71bb6ea75ee4b
- https://git.kernel.org/stable/c/6794090c742008c53b344b35b021d4a3093dc50a
- https://git.kernel.org/stable/c/92309bed3c5fbe2ccd4c45056efd42edbd06162d
- https://git.kernel.org/stable/c/bcd46782e2ec3825d10c1552fcb674d491cc09f9
- https://git.kernel.org/stable/c/cbaac2e5488ed54833897264a5ffb2a341a9f196
- https://git.kernel.org/stable/c/cfb786b03b03c5ff38882bee38525eb9987e4d14
- https://git.kernel.org/stable/c/d275de8ea7be3a453629fddae41d4156762e814c
- https://git.kernel.org/stable/c/d49fac38479bfdaec52b3ea274d290c47a294029
- https://launchpad.net/bugs/cve/CVE-2024-35902
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35902
- https://nvd.nist.gov/vuln/detail/CVE-2024-35902
- https://security-tracker.debian.org/tracker/CVE-2024-35902
- https://ubuntu.com/security/CVE-2024-35902
- https://git.kernel.org/linus/62fc3357e079a07a22465b9b6ef71bb6ea75ee4b
Frequently Asked Questions
What is the severity of CVE-2024-35902?
CVE-2024-35902 is considered a medium severity vulnerability due to its potential to cause null dereference issues in the Linux kernel.
How do I fix CVE-2024-35902?
To fix CVE-2024-35902, upgrade to the patched versions of the Linux kernel specified in the vulnerability report.
Which versions of the Linux kernel are affected by CVE-2024-35902?
CVE-2024-35902 affects specific versions of the Linux kernel between 4.19.310 and 4.19.312, as well as several ranges from 5.4.272 to 6.9-rc2.
What causes the null dereference in CVE-2024-35902?
The null dereference in CVE-2024-35902 is caused by the parameter 'cp' being potentially null when attempting to access 'cp->cp_conn'.
Is there a workaround for CVE-2024-35902?
There is no documented workaround for CVE-2024-35902, and updating to a secure kernel version is the recommended action.
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