CVE-2026-89628: Linux kernel · HID: picolcd: clamp eeprom debugfs read to bytes actually received
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that clamps the copy length to the actual received data size minus the header, preventing out-of-bounds reads. Users should apply the official Linux kernel update that resolves this issue. Since the debugfs file is root-only and exploitation requires a crafted device, no additional mitigations are necessary beyond applying the patch.
Description
A vulnerability in the Linux kernel's HID picolcd driver allows a crafted device to cause an out-of-bounds read via the debugfs eeprom interface. The flaw arises because the driver trusts a device-supplied length byte without properly validating it against the actual received data size, potentially leaking adjacent kernel memory to userspace. The debugfs file is root-only accessible, and exploitation requires a malicious or spoofed device, making unprivileged or remote exploitation not feasible. The issue has been resolved by clamping the read length to the actual received data size.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89628 (opens in a new tab)
- git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098 (opens in a new tab)
- git.kernel.org/stable/c/699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84 (opens in a new tab)
- git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b (opens in a new tab)
- git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89628.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)
- ubuntu.com/security/CVE-2026-89628 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89628 (opens in a new tab)
- git.kernel.org/linus/e9c667395ac1f8024f623250b32bae4c7af9caa0 (opens in a new tab)