CVE-2022-49755usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait
- 7.8HighCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% 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: 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).
Timeline
ID reserved
By Linux
Published
- 17 months later
· 17 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CISA-ADPADP (enrichment) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < facf353c9e8d7885b686d9a4b173d4e0af6441d2
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < a8d40942df074f4ebcb9bd3413596d92f323b064
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < 6dd9ea05534f323668db94fcc2726c7a84547e78
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < ae8e136bcaae96163b5821984de1036efc9abb1a
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < 6aee197b7fbcd61596a78b47d553f2f99111f217
- affected ddf8abd2599491cbad959c700b90ba72a5dce8d0 – < 6a19da111057f69214b97c62fb0ac59023970850
- affected 2.6.35
- unaffected < 2.6.35
- unaffected 4.14.305 – ≤ 4.14.*
- unaffected 4.19.272 – ≤ 4.19.*
- unaffected 5.4.231 – ≤ 5.4.*
- unaffected 5.10.166 – ≤ 5.10.*
- unaffected 5.15.91 – ≤ 5.15.*
- unaffected 6.1.9 – ≤ 6.1.*
- unaffected 6.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/facf353c9e8d7885b686d9a4b173d4e0af6441d2 (opens in a new tab)
- https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4 (opens in a new tab)
- https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064 (opens in a new tab)
- https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78 (opens in a new tab)
- https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a (opens in a new tab)
- https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217 (opens in a new tab)
- https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850 (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-2022-55168 (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-2022-49755)Record last updated .