Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: fix percpu counter block leak on error path when creating new netns Here is the stack where we allocate percpu counter block: +-< __alloc_percpu +-< xt_percpu_counter_alloc +-< find_check_entry # {arp,ip,ip6}_tables.c +-< translate_table And it can be leaked on this code path: +-> ip6t_register_table +-> translate_table # allocates percpu counter block +-> xt_register_table # fails there is no freeing of the counter block on xt_register_table fail. Note: xt_percpu_counter_free should be called to free it like we do in do_replace through cleanup_entry helper (or in __ip6t_unregister_table). Probability of hitting this error path is low AFAICS (xt_register_table can only return ENOMEM here, as it is not replacing anything, as we are creating new netns, and it is hard to imagine that all previous allocations succeeded and after that one in xt_register_table failed). But it's worth fixing even the rare leak.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.2, < 5.15.100 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0af8c09c896810879387decfba8c942994bb61f5Patch
- https://git.kernel.org/stable/c/3cc9610a87b7dde82f7360dd4eb6c2c27940ed57Patch
- https://git.kernel.org/stable/c/512b6c4b83c91d007301ea7d7f095d16c3aceacdPatch
- https://git.kernel.org/stable/c/e306dbee4c98025a9326386023a12ef4d887e9d1Patch
FAQ
What is CVE-2023-53200?
CVE-2023-53200 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: fix percpu counter block leak on error path when creating new netns Here is the stack where we allocate percp...
How severe is CVE-2023-53200?
CVE-2023-53200 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-53200?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.