{"id":"CVE-2026-93121","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths\n\nThe error paths for endpoint-disabled (ESHUTDOWN) and request-allocation\nfailure (ENOMEM) in …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths\n\nThe error paths for endpoint-disabled (ESHUTDOWN) and request-allocation\nfailure (ENOMEM) in …","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 < be539138d9a187af3b884525a395db10797c64f1","Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 < 5fd8baacc7dc477df9cac61b45491840247a9b1e","Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 < 58952c83dfe6ea3294a74734d2d1018c1120779a","Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 < 621707dc67c9846fd876d7579ec951d92aa033f1","Linux 6.9"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:18:21.560","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93121","references":[{"url":"https://git.kernel.org/stable/c/58952c83dfe6ea3294a74734d2d1018c1120779a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5fd8baacc7dc477df9cac61b45491840247a9b1e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/621707dc67c9846fd876d7579ec951d92aa033f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/be539138d9a187af3b884525a395db10797c64f1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00144,"epssPercentile":0.04092,"ingestedAt":"2026-09-17T16:21:47.751Z","slug":"CVE-2026-93121","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths\n\nThe error paths for endpoint-disabled (ESHUTDOWN) and request-allocation\nfailure (ENOMEM) in ffs_dmabuf_transfer() jump to err_fence_put which\ncalls dma_fence_put() on the fence. However, at that point the fence has\nonly been kmalloc'd — dma_fence_init() has not been called yet, so the\nrefcount and the fence ops are uninitialized. Calling dma_fence_put() on\nsuch an object leads to undefined behavior.\n\nUse kfree() instead, since the fence is just a plain allocation at this\nstage, and rename the label to err_fence_free to reflect the actual\ncleanup action.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207381,"id":"CVE-2026-93121","ts":1789757342244,"field":"cvss","old":null,"new":"7"},{"seq":207380,"id":"CVE-2026-93121","ts":1789757342244,"field":"severity","old":"none","new":"high"}]}