CVE-2026-64427HID: logitech-dj: Fix maxfield check in DJ short report validation
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% 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: 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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months 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 |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 7754ade02d0fb1caf20392baf4e02937378fd136 – < f3790a6af9c7f47d454225cab9dc145270e48f62
- affected 2ed9638cfbf9d49bdef9b0f5ee547236c2c2f500 – < 1215febd644c3e16f77e0f1799d89544dd57a754
- affected eeb5ad388595ca2b6624689198a057847f3a3e19 – < 6f7f22a8d244c2e586b8eb61c7585784b62aea01
- affected 968e84f5c0dca4960580d174500e4bbf0c45dc15 – < 95b3f23d632490b5eb285b9fcf7284f2ac8f9872
- affected ce2a731c179df8869e1969a1b2b5b9e4e1c25f8b – < 80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500
- affected bc3bba4656ad280267ea78cf845ab6b1d95b9fcd – < 2b70bebc709489d29a31ac2935aeffb8d5228395
- affected b6a57912854e7ea36f3b270032661140cc4209cd – < 7a89ad762fad53d56b7002d7ffc923a4b7f4006f
- affected b6a57912854e7ea36f3b270032661140cc4209cd – < 590cc4d782487632a52f37c2171bee1eeea29627
- affected 7.1
- unaffected < 7.1
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/f3790a6af9c7f47d454225cab9dc145270e48f62 (opens in a new tab)
- https://git.kernel.org/stable/c/1215febd644c3e16f77e0f1799d89544dd57a754 (opens in a new tab)
- https://git.kernel.org/stable/c/6f7f22a8d244c2e586b8eb61c7585784b62aea01 (opens in a new tab)
- https://git.kernel.org/stable/c/95b3f23d632490b5eb285b9fcf7284f2ac8f9872 (opens in a new tab)
- https://git.kernel.org/stable/c/80c1e18473f63fd7c6a2bc9ad6f3d0a6cc4fb500 (opens in a new tab)
- https://git.kernel.org/stable/c/2b70bebc709489d29a31ac2935aeffb8d5228395 (opens in a new tab)
- https://git.kernel.org/stable/c/7a89ad762fad53d56b7002d7ffc923a4b7f4006f (opens in a new tab)
- https://git.kernel.org/stable/c/590cc4d782487632a52f37c2171bee1eeea29627 (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-2026-48771 (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-2026-64427)Record last updated .