Description
In the Linux kernel, the following vulnerability has been resolved: mctp: perform route lookups under a RCU read-side lock Our current route lookups (mctp_route_lookup and mctp_route_lookup_null) traverse the net's route list without the RCU read lock held. This means the route lookup is subject to preemption, resulting in an potential grace period expiry, and so an eventual kfree() while we still have the route pointer. Add the proper read-side critical section locks around the route lookups, preventing premption and a possible parallel kfree. The remaining net->mctp.routes accesses are already under a rcu_read_lock, or protected by the RTNL for updates. Based on an analysis from Sili Luo <rootlab@huawei.com>, where introducing a delay in the route lookup could cause a UAF on simultaneous sendmsg() and route deletion.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
889b7da23abf92faf34491df95733bda63639e32 to < 6c52b12159049046483fdb0c411a0a1869c41a67affected889b7da23abf92faf34491df95733bda63639e32 to < 1db0724a01b558feb1ecae551782add1951a114aaffected889b7da23abf92faf34491df95733bda63639e32 to < 2405f64a95a7a094eb24cba9bcfaffd1ea264de4affected889b7da23abf92faf34491df95733bda63639e32 to < 5093bbfc10ab6636b32728e35813cbd79feb063caffected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.137 to ≤ 5.15.*unaffected6.1.59 to ≤ 6.1.*unaffected6.5.8 to ≤ 6.5.*unaffected6.6 to ≤ *unaffected