usb: gadget: f_fs: Fix Use-After-Free in AIO error path
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.
CVE-2026-90044
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90044
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "de2080d41b5d584205e408d72021f0f335a046fc",
"lessThan": "0a2f71ccf9c2053de725e9a7922d081f3f3a3804",
"versionType": "git"
},
{
"status": "affected",
"version": "de2080d41b5d584205e408d72021f0f335a046fc",
"lessThan": "b5f0e80a03e87bd932487e03248eae3ba3ed7b45",
"versionType": "git"
},
{
"status": "affected",
"version": "de2080d41b5d584205e408d72021f0f335a046fc",
"lessThan": "153b5ecd29ed055562400bc17c91df3fd869b0ce",
"versionType": "git"
},
{
"status": "affected",
"version": "de2080d41b5d584205e408d72021f0f335a046fc",
"lessThan": "4a2fb2d12b87b43724230abb52a1440617c7b6cc",
"versionType": "git"
},
{
"status": "affected",
"version": "de2080d41b5d584205e408d72021f0f335a046fc",
"lessThan": "e78dcb1f7ec271449c54984dc90c62a5ba272de7",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_fs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_fs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90044
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48589 · Revision 1
- Added to Heist Feed
- Publisher date