CVE-2023-52483

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux889b7da23abf92faf34491df95733bda63639e32 < 6c52b12159049046483fdb0c411a0a1869c41a67affected
LinuxLinux889b7da23abf92faf34491df95733bda63639e32 < 1db0724a01b558feb1ecae551782add1951a114aaffected
LinuxLinux889b7da23abf92faf34491df95733bda63639e32 < 2405f64a95a7a094eb24cba9bcfaffd1ea264de4affected
LinuxLinux889b7da23abf92faf34491df95733bda63639e32 < 5093bbfc10ab6636b32728e35813cbd79feb063caffected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.137 <= 5.15.*unaffected
LinuxLinux6.1.59 <= 6.1.*unaffected
LinuxLinux6.5.8 <= 6.5.*unaffected
LinuxLinux6.6 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References