Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: can: bcm: add missing device refcount for CAN filter removal sashiko-bot remarked a problem with a concurrent device unregistration in isotp.c which also is present in the bcm.c code. A former fix for raw.c commit c275a176e4b6 ("can: raw: add missing refcount for memory leak fix") introduced a netdevice_tracker which solves the issue for bcm.c too. bcm_release(), bcm_delete_rx_op() and bcm_notifier() relied on dev_get_by_index(ifindex) to re-find the device for an rx_op before unregistering its filter. If a concurrent NETDEV_UNREGISTER has already unlisted the device from the ifindex table, that lookup fails and can_rx_unregister() is silently skipped, leaving a stale CAN filter pointing at the soon-to-be-freed bcm_op/socket. Hold a netdev_hold()/netdev_put() tracked reference on op->rx_reg_dev from the moment the rx filter is registered in bcm_rx_setup() until it is unregistered in bcm_rx_unreg(), and use that reference directly in bcm_release() and bcm_delete_rx_op() instead of re-looking the device up by ifindex.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before bd5232663524e94cc5aad861dca11e3db8e2ab6f; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before ee8b36d0faca08f35b889b6e9aa850695e5b8ba9; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before dcaee869913c7210cd47ed0a8f27349d7bdcdb7b; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before 84aa4807816e405c1bf87114fc63e06d244281ef; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before 633bda66fbf309f5de5e1ad6defe8e6b1d77a20f; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before b024c21c9066f6957b7d4a8f2037e4b000c5e041; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before 04d23061bbf18d5d81022eb21e9d32e99d24468d; affected ffd980f976e7fd666c2e61bf8ab35107efd11828 before d59948293ea34b6337ce2b5febab8510de70048c |
| Linux / Linux | affected 2.6.25; unaffected 0 before 2.6.25; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f
- https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9
- https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b
- https://git.kernel.org/stable/c/84aa4807816e405c1bf87114fc63e06d244281ef
- https://git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f
- https://git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041
- https://git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d
- https://git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c
ADP enrichment
No English description supplied.
No references supplied.