CVE-2023-53200

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0af8c09c896810879387decfba8c942994bb61f5 ↗

Additional information

• NVD record
• 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