CVE-2022-48909: In the Linux kernel, the following vulnerability has been resolved: net/smc: fix connection leak There's a potential leak issue under following execution…

PriorityP420medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.24%

14.9th percentile

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix connection leak

There's a potential leak issue under following execution sequence :

smc_release smc_connect_work
if (sk->sk_state == SMC_INIT)
send_clc_confirim
tcp_abort();
...
sk.sk_state = SMC_ACTIVE
smc_close_active
switch(sk->sk_state) {
...
case SMC_ACTIVE:
smc_close_final()
// then wait peer closed

Unfortunately, tcp_abort() may discard CLC CONFIRM messages that are
still in the tcp send buffer, in which case our connection token cannot
be delivered to the server side, which means that we cannot get a
passive close message at all. Therefore, it is impossible for the to be
disconnected at all.

This patch tries a very simple way to avoid this issue, once the state
has changed to SMC_ACTIVE after tcp_abort(), we can actively abort the
smc connection, considering that the state is SMC_INIT before
tcp_abort(), abandoning the complete disconnection process should not
cause too much problem.

In fact, this problem may exist as long as the CLC CONFIRM message is
not received by the server. Whether a timer should be added after
smc_close_final() needs to be discussed in the future. But even so, this
patch provides a faster release for connection in above case, it should
also be valuable.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.16.14-1 (bookworm)	linux 5.16.14-1 (bookworm)
linux	linux	—	—
linux	linux	>= 39f41f367b08650e9aa314e3a13fb6dda1e9eec7 < 2e8d465b83db307f04ad265848f8ab3f78f6918f	2e8d465b83db307f04ad265848f8ab3f78f6918f
linux	linux	>= 39f41f367b08650e9aa314e3a13fb6dda1e9eec7 < 80895b6f9154fb22d36fab311ccbb75503a2c87b	80895b6f9154fb22d36fab311ccbb75503a2c87b
linux	linux	>= 39f41f367b08650e9aa314e3a13fb6dda1e9eec7 < e98d46ccfa84b35a9e4b1ccdd83961b41a5d7ce5	e98d46ccfa84b35a9e4b1ccdd83961b41a5d7ce5
linux	linux	>= 39f41f367b08650e9aa314e3a13fb6dda1e9eec7 < 9f1c50cf39167ff71dc5953a3234f3f6eeb8fcb5	9f1c50cf39167ff71dc5953a3234f3f6eeb8fcb5
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.106-1	5.10.106-1
linux	linux_kernel	>= 0 < 5.16.14-1	5.16.14-1
linux	linux_kernel	>= 0 < 5.16.14-1	5.16.14-1
linux	linux_kernel	>= 0 < 5.16.14-1	5.16.14-1
linux	linux_kernel	>= 5.11 < 5.15.27	5.15.27
linux	linux_kernel	>= 5.16 < 5.16.13	5.16.13
linux	linux_kernel	>= 5.3 < 5.10.104	5.10.104

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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