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Date: Thu, 29 Feb 2024 06:43:26 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: gregkh@...nel.org Subject: CVE-2023-52483: mctp: perform route lookups under a RCU read-side lock From: gregkh@...nel.org 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@...wei.com>, where introducing a delay in the route lookup could cause a UAF on simultaneous sendmsg() and route deletion. The Linux kernel CVE team has assigned CVE-2023-52483 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit 889b7da23abf and fixed in 5.15.137 with commit 6c52b1215904 Issue introduced in 5.15 with commit 889b7da23abf and fixed in 6.1.59 with commit 1db0724a01b5 Issue introduced in 5.15 with commit 889b7da23abf and fixed in 6.5.8 with commit 2405f64a95a7 Issue introduced in 5.15 with commit 889b7da23abf and fixed in 6.6 with commit 5093bbfc10ab Please see https://www.kernel.org or a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2023-52483 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/mctp/route.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/6c52b12159049046483fdb0c411a0a1869c41a67 https://git.kernel.org/stable/c/1db0724a01b558feb1ecae551782add1951a114a https://git.kernel.org/stable/c/2405f64a95a7a094eb24cba9bcfaffd1ea264de4 https://git.kernel.org/stable/c/5093bbfc10ab6636b32728e35813cbd79feb063c
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