UBUNTU-CVE-2021-47001
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().
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
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70 explicit affected versions
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35 explicit affected versions
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7 explicit affected versions
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1 explicit affected versions
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86 explicit affected versions
12 explicit affected versions
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37 explicit affected versions
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10 explicit affected versions
26 explicit affected versions
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13 explicit affected versions
60 explicit affected versions
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1 explicit affected versions
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8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
89 explicit affected versions
13 explicit affected versions
53 explicit affected versions
7 explicit affected versions
10 explicit affected versions
12 explicit affected versions
89 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
7 explicit affected versions
61 explicit affected versions
4 explicit affected versions
43 explicit affected versions
55 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
90 explicit affected versions
4 explicit affected versions
78 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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().
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/35d8b10a25884050bb3b0149b62c3818ec59f77c
- https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0
- https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c
- https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95
- https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4
- https://ubuntu.com/security/CVE-2021-47001
- https://ubuntu.com/security/notices/USN-7173-1
- https://ubuntu.com/security/notices/USN-7173-2
- https://ubuntu.com/security/notices/USN-7173-3
- https://ubuntu.com/security/notices/USN-7195-1
- https://ubuntu.com/security/notices/USN-7195-2
- https://ubuntu.com/security/notices/USN-7413-1
- https://www.cve.org/CVERecord?id=CVE-2021-47001