CVE-2026-89622HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes
- 7.8HighCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes mcp_i2c_smbus_read() stores the caller-supplied buffer pointer in mcp->rxbuf for the duration of a transfer but never clears it when the transfer finishes or times out. Once the caller frees or reuses the buffer, mcp->rxbuf becomes a dangling pointer. A delayed or spurious MCP2221_I2C_GET_DATA report can then drive mcp2221_raw_event() to memcpy device data into the freed memory, causing a write use-after-free. Route all return paths through a single exit point that clears mcp->rxbuf and mcp->rxbuf_size, so that the existing !mcp->rxbuf guard in the raw_event handler can reject any report arriving after the transfer has ended.
Timeline
ID reserved
By Linux
Published
- 49 days later
· 49 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 94% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 67a95c21463d066060b0f66d65a75d45bb386ffb – < 198bf4a226229e36dfe254493a45c71c3ffc7e57
- affected 67a95c21463d066060b0f66d65a75d45bb386ffb – < bd146a8ff107c6d77e75597decbcd1df0d7900d6
- affected 67a95c21463d066060b0f66d65a75d45bb386ffb – < d6c6b293173c0ea87189501cbd77e8fa677814a1
- affected 67a95c21463d066060b0f66d65a75d45bb386ffb – < 03c34309eb1bce1b3b5f7c4a94b703f419120383
- affected 67a95c21463d066060b0f66d65a75d45bb386ffb – < 968546b676d992dd1da3e057d40598231f725996
- affected 67a95c21463d066060b0f66d65a75d45bb386ffb – < db2333f88729c8aae062cb171ed058725ff5c901
- affected 5.7
- unaffected < 5.7
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/198bf4a226229e36dfe254493a45c71c3ffc7e57 (opens in a new tab)
- https://git.kernel.org/stable/c/bd146a8ff107c6d77e75597decbcd1df0d7900d6 (opens in a new tab)
- https://git.kernel.org/stable/c/d6c6b293173c0ea87189501cbd77e8fa677814a1 (opens in a new tab)
- https://git.kernel.org/stable/c/03c34309eb1bce1b3b5f7c4a94b703f419120383 (opens in a new tab)
- https://git.kernel.org/stable/c/968546b676d992dd1da3e057d40598231f725996 (opens in a new tab)
- https://git.kernel.org/stable/c/db2333f88729c8aae062cb171ed058725ff5c901 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76534 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89622)Record last updated .