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Date: Wed, 28 Feb 2024 09:14:51 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: gregkh@...nel.org Subject: CVE-2021-47001: xprtrdma: Fix cwnd update ordering From: gregkh@...nel.org Description =========== In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix cwnd update ordering After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs() can post enough Receive WRs to receive their replies. This causes an RNR and the new connection is lost immediately. The race is most clearly exposed when KASAN and disconnect injection are enabled. This slows down rpcrdma_rep_create() enough to allow the send side to post a bunch of RPC Calls before the Receive completion handler can invoke ib_post_recv(). The Linux kernel CVE team has assigned CVE-2021-47001 to this issue. Affected and fixed versions =========================== Issue introduced in 5.5 with commit 2ae50ad68cd7 and fixed in 5.10.38 with commit eddae8be7944 Issue introduced in 5.5 with commit 2ae50ad68cd7 and fixed in 5.11.22 with commit 8834ecb5df22 Issue introduced in 5.5 with commit 2ae50ad68cd7 and fixed in 5.12.5 with commit 19b5fa9489b5 Issue introduced in 5.5 with commit 2ae50ad68cd7 and fixed in 5.13 with commit 35d8b10a2588 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-2021-47001 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/sunrpc/xprtrdma/rpc_rdma.c net/sunrpc/xprtrdma/verbs.c net/sunrpc/xprtrdma/xprt_rdma.h 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/eddae8be7944096419c2ae29477a45f767d0fcd4 https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95 https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0 https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c
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