CVE-2022-49820

mctp i2c: don't count unused / invalid keys for flow release

Description

In the Linux kernel, the following vulnerability has been resolved: mctp i2c: don't count unused / invalid keys for flow release We're currently hitting the WARN_ON in mctp_i2c_flow_release: if (midev->release_count > midev->i2c_lock_count) { WARN_ONCE(1, "release count overflow"); This may be hit if we expire a flow before sending the first packet it contains - as we will not be pairing the increment of release_count (performed on flow release) with the i2c lock operation (only performed on actual TX). To fix this, only release a flow if we've encountered it previously (ie, dev_flow_state does not indicate NEW), as we will mark the flow as ACTIVE at the same time as accounting for the i2c lock operation. We also need to add an INVALID flow state, to indicate when we've done the release.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/a5915a9a3ab4067ef8996a57738d156eabeb3a12
https://git.kernel.org/stable/c/9cbd48d5fa14e4c65f8580de16686077f7cea02b

Frequently Asked Questions

What is the severity of CVE-2022-49820?: CVE-2022-49820 has not yet been assigned a CVSS score.
How to fix CVE-2022-49820?: To fix CVE-2022-49820, 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-2022-49820 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49820 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-2022-49820?: CVE-2022-49820 affects Linux Linux, Linux Linux.

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