CVE-2026-64347usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
- 5.5MediumCVSS base score
- 0.10%Exploitation in 30 daysEPSS · top 99% 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: usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler The OTG branch of composite_setup() falls back to the first configuration when none is selected: if (cdev->config) config = cdev->config; else config = list_first_entry(&cdev->configs, struct usb_configuration, list); if (!config) goto done; ... memcpy(req->buf, config->descriptors[0], value); list_first_entry() never returns NULL. On an empty list it returns container_of() of the list head. So the "if (!config)" check is dead. When cdev->configs is empty, config points at the head inside struct usb_composite_dev. config->descriptors[0] reads whatever sits at that offset. The memcpy copies up to w_length bytes of it into the response buffer. cdev->configs can be empty in two cases. One is a teardown race on gadget unbind with a control transfer in flight. The other is a driver that sets is_otg before it adds a config. A reproducer that holds cdev->configs empty triggers a KASAN fault in this branch. Use list_first_entry_or_null() so the existing check does its job.
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)
- 0.10% · top 99% 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 53e6242db8d60da0587d36951cc9434d1a1c21dd – < 2454264b2ab4cf0055c0bfd39e79f830452bd0db
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < d3e72cfef2e38bd588055739a8100d14f9773b17
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < 56add2b9b2e89ec61c0761165d758f73004fdfdf
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < 91b3ecd34b60f950c50c560974945b6596a6f207
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < fcb21bf747640c9d6bd1eda9da85420f076d59c1
- affected 53e6242db8d60da0587d36951cc9434d1a1c21dd – < f8f680609c2b3ab795ffcd6f21585b6dfc46d395
- affected 4.3
- unaffected < 4.3
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db (opens in a new tab)
- https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17 (opens in a new tab)
- https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 (opens in a new tab)
- https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf (opens in a new tab)
- https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207 (opens in a new tab)
- https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b (opens in a new tab)
- https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1 (opens in a new tab)
- https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395 (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-2026-48891 (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-2026-64347)Record last updated .