Vulnerability details
CVE-2022-49755
usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait
Official description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind. Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free. Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 2.6.35 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < a8d40942df074f4ebcb9bd3413596d92f323b064 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < 6dd9ea05534f323668db94fcc2726c7a84547e78 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < facf353c9e8d7885b686d9a4b173d4e0af6441d2 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < 6aee197b7fbcd61596a78b47d553f2f99111f217 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < 6a19da111057f69214b97c62fb0ac59023970850 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | ddf8abd2599491cbad959c700b90ba72a5dce8d0 ≤ v < ae8e136bcaae96163b5821984de1036efc9abb1a | CVEProject cvelistV5 (CNA) |
References and advisories
7- https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2
- https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4
- https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064
- https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78
- https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a
- https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217
- https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850
Details
- Published
- 2025-03-27
- Last updated
- 2026-08-05
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-416Use After Free