Answer in brief
CVE-2026-64328 records a Medium severity (CVSS 5.5) vulnerability in usb: gadget: f_fs: Fix DMA fence leak. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7b07a2a7ca02a20124b552be96c5a56910795488 <b7475b2dce5e121e687280ba5732ccefe77ffd2f || >=7b07a2a7ca02a20124b552be96c5a56910795488 <e086c16962a1b0142e2675610e9c06fcfcd4c3a8 || >=7b07a2a7ca02a20124b552be96c5a56910795488 <0cae3d6109427c455bad0a18dfb3e2a91657e38a || >=7b07a2a7ca02a20124b552be96c5a56910795488 <baa6b6068a3f2bf2ed525a1cb37975905dadc658 | b7475b2dce5e121e687280ba5732ccefe77ffd2f, e086c16962a1b0142e2675610e9c06fcfcd4c3a8, 0cae3d6109427c455bad0a18dfb3e2a91657e38a, baa6b6068a3f2bf2ed525a1cb37975905dadc658 |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 11, 2026
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix DMA fence leak In ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the underlying dma_fence later initialized by dma_fence_init(), which sets its kref counter to 1. Then, dma_resv_add_fence() gets a second reference, and a pointer to the ffs_dma_fence is passed as the usb_request's "context" field. The dma-resv mechanism will manage the second reference, but the first reference is never properly released; the ffs_dmabuf_cleanup() function decreases the reference count, but only to balance with the reference grab in ffs_dmabuf_signal_done(). The code will then slowly leak memory as more ffs_dma_fence objects are created without being ever freed. Address this issue by transferring ownership of the fence to the DMA reservation object, by calling dma_fence_put() right after dma_resv_add_fence(). The ffs_dma_fence then gets properly discarded after being signalled.
Quoted source text, attributed separately from HOL analysis.