CVE-2026-90044: Linux kernel · usb: gadget: f_fs: Fix Use-After-Free in AIO error path
Source GCVE Database
Not known to be exploited · CVSS 7.8 High · fixed in e78dcb1f7ec271449c54984dc90c62a5ba272de7 : patch Linux kernel soon.
Data as of 30 Oct 2026, 16:33 UTC
Thin evidence
One scorer or none| CNA (Linux) | CVSS 3.1 | 7.8 |
|---|
- Patch
- Available – fixed in e78dcb1f7ec271449c54984dc90c62a5ba272de7, b5f0e80a03e87bd932487e03248eae3ba3ed7b45, 922a29e1f8573fd405eea1a73a52112c4e7fcfc4 +3
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.
References
- nvd.nist.gov/vuln/detail/CVE-2026-90044 (opens in a new tab)
- git.kernel.org/stable/c/0a2f71ccf9c2053de725e9a7922d081f3f3a3804 (opens in a new tab)
- git.kernel.org/stable/c/153b5ecd29ed055562400bc17c91df3fd869b0ce (opens in a new tab)
- git.kernel.org/stable/c/4a2fb2d12b87b43724230abb52a1440617c7b6cc (opens in a new tab)
- git.kernel.org/stable/c/922a29e1f8573fd405eea1a73a52112c4e7fcfc4 (opens in a new tab)
- git.kernel.org/stable/c/b5f0e80a03e87bd932487e03248eae3ba3ed7b45 (opens in a new tab)
- git.kernel.org/stable/c/e78dcb1f7ec271449c54984dc90c62a5ba272de7 (opens in a new tab)