Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/smc: fix socket use-after-free during link group termination __smc_lgr_terminate() drops conns_lock after finding a connection in lgr->conns_all, but before taking a reference on its socket. The connection is embedded in the socket, and its registration reference protects it only while the connection remains in the tree. A concurrent close can unregister the connection and drop that reference, freeing the socket before the termination worker reaches sock_hold(). The race is reachable when close overlaps link group termination. Local stress testing reproduced the use-after-free and KASAN reported: BUG: KASAN: slab-use-after-free in __smc_lgr_terminate.part.0 [smc] Write of size 4 by task kworker/3:3 Workqueue: events smc_lgr_terminate_work [smc] __smc_lgr_terminate.part.0 [smc] The socket was allocated by smc_create(), freed through slab_free_after_rcu_debug(), and was followed by: refcount_t: addition on 0; use-after-free. __smc_lgr_terminate.part.0 [smc] Take the socket reference while conns_lock still protects the tree entry. The unregister path then cannot drop the last reference until termination has finished using the socket.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before ff44f2df57fb5560bdc75eb977867643e764a262; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before 9fb17c95b8f0683570fca1fb2792264147af937a; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before bea8dc14de2d56aca749d368563e6888217710a5; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before 5a42f162b857019a4c10ff687dc3bcdf51831865; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before 281c103a8eaed59001ce952f231df1b07674215a; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before f807a63d0d95680c34f677700da9148a07d7c78f; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before f0541a775d04c88e90ba448e35ce0d743512822a; affected 69318b5215f2dc32c345a3d65b98b4b1bf29c007 before f621d6ebeebb6374342571e4ddf45fdbc420f6cd |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.151 through 6.6.*; unaffected 6.12.103 through 6.12.*; unaffected 6.18.44 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ff44f2df57fb5560bdc75eb977867643e764a262
- https://git.kernel.org/stable/c/9fb17c95b8f0683570fca1fb2792264147af937a
- https://git.kernel.org/stable/c/bea8dc14de2d56aca749d368563e6888217710a5
- https://git.kernel.org/stable/c/5a42f162b857019a4c10ff687dc3bcdf51831865
- https://git.kernel.org/stable/c/281c103a8eaed59001ce952f231df1b07674215a
- https://git.kernel.org/stable/c/f807a63d0d95680c34f677700da9148a07d7c78f
- https://git.kernel.org/stable/c/f0541a775d04c88e90ba448e35ce0d743512822a
- https://git.kernel.org/stable/c/f621d6ebeebb6374342571e4ddf45fdbc420f6cd
ADP enrichment
No English description supplied.
No references supplied.