nvmet: fix max_qid race between configfs and controller allocation
In the Linux kernel, the following vulnerability has been resolved: nvmet: fix max_qid race between configfs and controller allocation The function nvmet_subsys_attr_qid_max_store() can race against nvmet_alloc_ctrl() when a subsystem's max_qid limit is modified. Suppose max_qid is currently 64. If nvmet_alloc_ctrl() executes: ctrl->sqs = kzalloc_objs(struct nvmet_sq *, subsys->max_qid + 1); and at this exact point, a userspace process changes max_qid to 128, nvmet_subsys_attr_qid_max_store() will set the new max_qid value. It attempts to delete active controllers to force a reconnect, but the new controller won't be deleted because it hasn't been added to the subsys->ctrls list yet. nvmet_alloc_ctrl() then proceeds and adds the new controller to the subsys->ctrls list. Later, when nvmet_install_queue() is called, it will see max_qid set to 128, but the memory allocated for sqs is only sized for 64 entries. This results in a KASAN out-of-bounds warning and potential memory corruptions. Fix this by protecting the queue allocations and list insertion in nvmet_alloc_ctrl() with down_read(&nvmet_config_sem). Because nvmet_subsys_attr_qid_max_store() acquires down_write(&nvmet_config_sem) to modify the attribute, this safely prevents the configfs writer from modifying max_qid during controller creation. Copy the max_qid from the subsystem to the controller's structure during the allocation; ctrl->max_qid never changes as long as the controller remains in LIVE state, so this will p
CVE-2026-90206
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-2026-90206
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": "3e980f5995e0bb4d86fef873a9c9ad66721580d0",
"lessThan": "af811970da4f0a928f5a1b1a946a04f755ce86f2",
"versionType": "git"
},
{
"status": "affected",
"version": "3e980f5995e0bb4d86fef873a9c9ad66721580d0",
"lessThan": "a1b88a1782eb6b368071dcda548a41b5c23d8cd2",
"versionType": "git"
},
{
"status": "affected",
"version": "3e980f5995e0bb4d86fef873a9c9ad66721580d0",
"lessThan": "6e6f8e3bfc66dff1833a48ecfd857268cff3be84",
"versionType": "git"
},
{
"status": "affected",
"version": "3e980f5995e0bb4d86fef873a9c9ad66721580d0",
"lessThan": "2c23fc91789dfd9db746edb3ae9b90d65fabd410",
"versionType": "git"
},
{
"status": "affected",
"version": "3e980f5995e0bb4d86fef873a9c9ad66721580d0",
"lessThan": "f1a8846e06388113dfdbb89dee005083fa9afdf9",
"versionType": "git"
}
],
"programFiles": [
"drivers/nvme/target/admin-cmd.c",
"drivers/nvme/target/core.c",
"drivers/nvme/target/fabrics-cmd.c",
"drivers/nvme/target/nvmet.h",
"drivers/nvme/target/pci-epf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nvme/target/admin-cmd.c",
"drivers/nvme/target/core.c",
"drivers/nvme/target/fabrics-cmd.c",
"drivers/nvme/target/nvmet.h",
"drivers/nvme/target/pci-epf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90206
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48634 · Revision 1
- Added to Heist Feed
- Publisher date