HID: picolcd: clamp eeprom debugfs read to bytes actually received
In the Linux kernel, the following vulnerability has been resolved: HID: picolcd: clamp eeprom debugfs read to bytes actually received picolcd_debug_eeprom_read() trusts resp->raw_data[2] -- a length byte supplied by the device in its REPORT_EE_DATA reply -- clamped only to the caller's read() count: ret = resp->raw_data[2]; if (ret > s) ret = s; if (copy_to_user(u, resp->raw_data+3, ret)) It never checks resp->raw_size, the number of bytes picolcd_raw_event() actually copied into the 64-byte raw_data[] of the kmalloc'd struct picolcd_pending. A device (or a spoofed picoLCD) returning a length byte of 0xff, read with a count >= 255, makes copy_to_user() read past raw_data[] into adjacent slab memory and return it to userspace through the debugfs "eeprom" file: BUG: KASAN: slab-out-of-bounds in _copy_to_user Read of size 255 ... picolcd_debug_eeprom_read+0x214/0x2f0 [hid_picolcd] The debug-dump path in the same file already validates the device length byte against the received size before trusting it; this read does not. The file is created S_IRUSR (root-only) and a crafted device is needed, so it is neither unprivileged- nor remotely-triggerable. Clamp the copy length to resp->raw_size - 3 (the payload actually received, minus the 3-byte header), floored at 0 for short replies.
CVE-2026-89628
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-2026-89628
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": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "1a02056c2bf7ef9b5fd05ee6913aeeadb703c443",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "65daa322f1021d8206f8032c4cd4c0cb2d26c7c3",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "8dc662af019158690c470edd2e2857657f700abb",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "4daf432c94a42e7be6aa10b012b33af5ed9bc118",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "a3e6e8d7198a9f3861861520a38b673684a1062b",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "471f4a939c66d1d44aece2321807abf609fc9098",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84",
"versionType": "git"
},
{
"status": "affected",
"version": "9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba",
"lessThan": "e9c667395ac1f8024f623250b32bae4c7af9caa0",
"versionType": "git"
}
],
"programFiles": [
"drivers/hid/hid-picolcd_debugfs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.35"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.35",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"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-picolcd_debugfs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89628
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35130 · Revision 1
- Added to Heist Feed
- Publisher date