CVE-2022-48819

tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case syzbot found that mixing sendpage() and sendmsg(MSG_ZEROCOPY) calls over the same TCP socket would again trigger the infamous warning in inet_sock_destruct() WARN_ON(sk_forward_alloc_get(sk)); While Talal took into account a mix of regular copied data and MSG_ZEROCOPY one in the same skb, the sendpage() path has been forgotten. We want the charging to happen for sendpage(), because pages could be coming from a pipe. What is missing is the downgrading of pure zerocopy status to make sure sk_forward_alloc will stay synced. Add tcp_downgrade_zcopy_pure() helper so that we can use it from the two callers.

N/A

CVSS

Severity:

EPSS 0.06%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/47f3860c4931175f112f28dcac66eacca9b1040f
https://git.kernel.org/stable/c/f8d9d938514f46c4892aff6bfe32f425e84d81cc

Frequently Asked Questions

What is the severity of CVE-2022-48819?: CVE-2022-48819 has not yet been assigned a CVSS score.
How to fix CVE-2022-48819?: To fix CVE-2022-48819, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-48819 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-48819 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-48819?: CVE-2022-48819 affects Linux Linux, Linux Linux.

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