CVE-2026-64427: Linux kernel · HID: logitech-dj: Fix maxfield check in DJ short report validation
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f3790a6af9c7f47d454225cab9dc145270e48f62 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in f3790a6af9c7f47d454225cab9dc145270e48f62, 1215febd644c3e16f77e0f1799d89544dd57a754, 590cc4d782487632a52f37c2171bee1eeea29627 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Description
In the Linux kernel, the following vulnerability has been resolved: HID: logitech-dj: Fix maxfield check in DJ short report validation Commit b6a57912854e ("HID: logitech-dj: Prevent REPORT_ID_DJ_SHORT related user initiated OOB write") added validation for the DJ short output report, but the error path dereferences rep->field[0] even when rep->maxfield is zero. Commit 8b9a097eb2fc ("HID: logitech-dj: fix wrong detection of bad DJ_SHORT output report") made the check conditional on rep being present, but a crafted descriptor can still create report ID 0x20 with only padding output items. hid-core registers the report, ignores the padding field, and leaves rep->maxfield as zero. In that case the validation enters the rep->maxfield < 1 branch and then dereferences rep->field[0]->report_count while printing the error message, causing a NULL pointer dereference during probe. This is reproducible with uhid by emulating a Logitech receiver with a padding-only DJ short output report: BUG: KASAN: null-ptr-deref in logi_dj_probe+0xb1/0x754 [hid_logitech_dj] Read of size 4 at addr 0000000000000028 by task kworker/4:1/129 ... Call Trace: logi_dj_probe+0xb1/0x754 [hid_logitech_dj] hid_device_probe+0x329/0x3f0 [hid] really_probe+0x162/0x570 __device_attach+0x137/0x2c0 bus_probe_device+0x38/0xc0 device_add+0xa56/0xce0 hid_add_device+0x19c/0x280 [hid] uhid_device_add_worker+0x2c/0xb0 [uhid] Reject the zero-field report before printing the field report_count.
References
- git.kernel.org/stable/c/f3790a6af9c7f47d454225cab9dc145270e48f62 (opens in a new tab)
- git.kernel.org/stable/c/1215febd644c3e16f77e0f1799d89544dd57a754 (opens in a new tab)
- git.kernel.org/stable/c/6f7f22a8d244c2e586b8eb61c7585784b62aea01 (opens in a new tab)
- git.kernel.org/stable/c/95b3f23d632490b5eb285b9fcf7284f2ac8f9872 (opens in a new tab)
- git.kernel.org/stable/c/80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500 (opens in a new tab)
- git.kernel.org/stable/c/2b70bebc709489d29a31ac2935aeffb8d5228395 (opens in a new tab)
- git.kernel.org/stable/c/7a89ad762fad53d56b7002d7ffc923a4b7f4006f (opens in a new tab)
- git.kernel.org/stable/c/590cc4d782487632a52f37c2171bee1eeea29627 (opens in a new tab)