CVE-2023-52483High· 7.8▾ TwilightIn 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 t…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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 [email protected], where introducing a delay in the route lookup could cause a UAF on simultaneous sendmsg() and route deletion.
linux_kernel >= 5.15, < 5.15.137linux_kernel >= 5.16, < 6.1.59linux_kernel >= 6.2, < 6.5.8linux_kernel = 6.6Upgrade past the affected range:
linux_kernel 6.5.8Connected by shared product, vendor, weakness, or advisory.
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