# CVE-2022-49820: linux: In the Linux kernel, the following vulnerability has been resolved:  mctp i2c: don't count unused / invalid keys for...

CVE-2022-49820 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49820, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49820
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49820](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49820.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49820](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49820.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49820](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49820.md) | May 1, 2025 |

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