HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes
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.
CVE-2026-89622
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89622
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
"lessThan": "bd146a8ff107c6d77e75597decbcd1df0d7900d6",
"versionType": "git"
},
{
"status": "affected",
"version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
"lessThan": "d6c6b293173c0ea87189501cbd77e8fa677814a1",
"versionType": "git"
},
{
"status": "affected",
"version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
"lessThan": "03c34309eb1bce1b3b5f7c4a94b703f419120383",
"versionType": "git"
},
{
"status": "affected",
"version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
"lessThan": "968546b676d992dd1da3e057d40598231f725996",
"versionType": "git"
},
{
"status": "affected",
"version": "67a95c21463d066060b0f66d65a75d45bb386ffb",
"lessThan": "db2333f88729c8aae062cb171ed058725ff5c901",
"versionType": "git"
}
],
"programFiles": [
"drivers/hid/hid-mcp2221.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/hid/hid-mcp2221.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89622
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46687 · Revision 1
- Added to Heist Feed
- Publisher date