Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: fix refcount leak on table dump There is a reference count leak in ctnetlink_dump_table(): if (res < 0) { nf_conntrack_get(&ct->ct_general); // HERE cb->args[1] = (unsigned long)ct; ... While its very unlikely, its possible that ct == last. If this happens, then the refcount of ct was already incremented. This 2nd increment is never undone. This prevents the conntrack object from being released, which in turn keeps prevents cnet->count from dropping back to 0. This will then block the netns dismantle (or conntrack rmmod) as nf_conntrack_cleanup_net_list() will wait forever. This can be reproduced by running conntrack_resize.sh selftest in a loop. It takes ~20 minutes for me on a preemptible kernel on average before I see a runaway kworker spinning in nf_conntrack_cleanup_net_list. One fix would to change this to: if (res < 0) { if (ct != last) nf_conntrack_get(&ct->ct_general); But this reference counting isn't needed in the first place. We can just store a cookie value instead. A followup patch will do the same for ctnetlink_exp_dump_table, it looks to me as if this has the same problem and like ctnetlink_dump_table, we only need a 'skip hint', not the actual object so we can apply the same cookie strategy there as well.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d205dc40798d97d63ad348bfaf7394f445d152d4 before 586892e341fbf698e7cbaca293e1353957db725a; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before 962518c6ca9f9a13df099cafa429f72f68ad61f0; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before 19b909a4b1452fb97e477d2f08b97f8d04095619; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before 41462f4cfc583513833f87f9ee55d12da651a7e3; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before 30cf811058552b8cd0e98dff677ef3f89d6d34ce; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before a2cb4df7872de069f809de2f076ec8e54d649fe3; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before e14f72aa66c029db106921d621edcedef68e065b; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before a62d6aa3f31f216b637a4c71b7a8bfc7c57f049b; affected d205dc40798d97d63ad348bfaf7394f445d152d4 before de788b2e6227462b6dcd0e07474e72c089008f74 |
| Linux / Linux | affected 2.6.18; unaffected 0 before 2.6.18; unaffected 5.4.297 through 5.4.*; unaffected 5.10.241 through 5.10.*; unaffected 5.15.190 through 5.15.*; unaffected 6.1.149 through 6.1.*; unaffected 6.6.103 through 6.6.*; unaffected 6.12.43 through 6.12.*; unaffected 6.15.11 through 6.15.*; unaffected 6.16.2 through 6.16.*; unaffected 6.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/586892e341fbf698e7cbaca293e1353957db725a
- https://git.kernel.org/stable/c/962518c6ca9f9a13df099cafa429f72f68ad61f0
- https://git.kernel.org/stable/c/19b909a4b1452fb97e477d2f08b97f8d04095619
- https://git.kernel.org/stable/c/41462f4cfc583513833f87f9ee55d12da651a7e3
- https://git.kernel.org/stable/c/30cf811058552b8cd0e98dff677ef3f89d6d34ce
- https://git.kernel.org/stable/c/a2cb4df7872de069f809de2f076ec8e54d649fe3
- https://git.kernel.org/stable/c/e14f72aa66c029db106921d621edcedef68e065b
- https://git.kernel.org/stable/c/a62d6aa3f31f216b637a4c71b7a8bfc7c57f049b
- https://git.kernel.org/stable/c/de788b2e6227462b6dcd0e07474e72c089008f74
ADP enrichment
No English description supplied.
No English description supplied.