CVE-2026-93121usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths
- 7.0HighCVSS base score
- 0.15%Exploitation in 30 daysEPSS · top 95% 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: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths The error paths for endpoint-disabled (ESHUTDOWN) and request-allocation failure (ENOMEM) in ffs_dmabuf_transfer() jump to err_fence_put which calls dma_fence_put() on the fence. However, at that point the fence has only been kmalloc'd — dma_fence_init() has not been called yet, so the refcount and the fence ops are uninitialized. Calling dma_fence_put() on such an object leads to undefined behavior. Use kfree() instead, since the fence is just a plain allocation at this stage, and rename the label to err_fence_free to reflect the actual cleanup action.
Timeline
ID reserved
By Linux
Published
- 32 days later
· 32 days 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 95% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.
Affected products
- affected 7b07a2a7ca02a20124b552be96c5a56910795488 – < be539138d9a187af3b884525a395db10797c64f1
- affected 7b07a2a7ca02a20124b552be96c5a56910795488 – < 5fd8baacc7dc477df9cac61b45491840247a9b1e
- affected 7b07a2a7ca02a20124b552be96c5a56910795488 – < 58952c83dfe6ea3294a74734d2d1018c1120779a
- affected 7b07a2a7ca02a20124b552be96c5a56910795488 – < 621707dc67c9846fd876d7579ec951d92aa033f1
- affected 6.9
- unaffected < 6.9
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/be539138d9a187af3b884525a395db10797c64f1 (opens in a new tab)
- https://git.kernel.org/stable/c/5fd8baacc7dc477df9cac61b45491840247a9b1e (opens in a new tab)
- https://git.kernel.org/stable/c/58952c83dfe6ea3294a74734d2d1018c1120779a (opens in a new tab)
- https://git.kernel.org/stable/c/621707dc67c9846fd876d7579ec951d92aa033f1 (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-2026-82229 (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-2026-93121)Record last updated .