CVE-2026-90044usb: gadget: f_fs: Fix Use-After-Free in AIO error path
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 93% 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 Use-After-Free in AIO error path In ffs_epfile_write_iter() and ffs_epfile_read_iter(), when ffs_epfile_io() fails with an error other than -EIOCBQUEUED, the io_data structure (`p`) is freed. However, for AIO operations, the kiocb cancel function was already armed and kiocb->private was set to `p`. If a concurrent cancel operation (such as sys_io_cancel()) executes after ffs_epfile_io() fails but before the function frees `p`, a Use-After-Free can occur when the cancellation handler accesses the freed pointer. To securely fix this race condition, we must properly un-arm the cancellation. Invoking `kiocb->ki_complete()` does exactly this by acquiring `ctx->ctx_lock` and safely removing the kiocb from the active sequence. In doing so, it ensures that a parallel io_cancel can no longer discover the kiocb, effectively closing the race window. We then return -EIOCBQUEUED to notify the VFS layer that the kiocb has been consumed and it should avoid attempting to complete the request again or triggering subsequent completion handlers.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 44 days later
· 44 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 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 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)
- 0.17% · top 93% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected de2080d41b5d584205e408d72021f0f335a046fc – < 922a29e1f8573fd405eea1a73a52112c4e7fcfc4
- affected de2080d41b5d584205e408d72021f0f335a046fc – < 0a2f71ccf9c2053de725e9a7922d081f3f3a3804
- affected de2080d41b5d584205e408d72021f0f335a046fc – < b5f0e80a03e87bd932487e03248eae3ba3ed7b45
- affected de2080d41b5d584205e408d72021f0f335a046fc – < 153b5ecd29ed055562400bc17c91df3fd869b0ce
- affected de2080d41b5d584205e408d72021f0f335a046fc – < 4a2fb2d12b87b43724230abb52a1440617c7b6cc
- affected de2080d41b5d584205e408d72021f0f335a046fc – < e78dcb1f7ec271449c54984dc90c62a5ba272de7
- affected 4.0
- unaffected < 4.0
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.111 – ≤ 6.12.*
- unaffected 6.18.51 – ≤ 6.18.*
- unaffected 7.2.5 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/922a29e1f8573fd405eea1a73a52112c4e7fcfc4 (opens in a new tab)
- https://git.kernel.org/stable/c/0a2f71ccf9c2053de725e9a7922d081f3f3a3804 (opens in a new tab)
- https://git.kernel.org/stable/c/b5f0e80a03e87bd932487e03248eae3ba3ed7b45 (opens in a new tab)
- https://git.kernel.org/stable/c/153b5ecd29ed055562400bc17c91df3fd869b0ce (opens in a new tab)
- https://git.kernel.org/stable/c/4a2fb2d12b87b43724230abb52a1440617c7b6cc (opens in a new tab)
- https://git.kernel.org/stable/c/e78dcb1f7ec271449c54984dc90c62a5ba272de7 (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-2026-80652 (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-2026-90044)Record last updated .