ksmbd: detach blocked lock requests before freeing
In the Linux kernel, the following vulnerability has been resolved: ksmbd: detach blocked lock requests before freeing A file_lock retained by ksmbd for byte-range lock bookkeeping can still be part of the VFS blocked-request graph. In particular, the VFS can chain a new waiter below an already blocked request through flc_blocked_requests. The ksmbd_file reference count does not cover that graph. Both __ksmbd_close_fd() and the cross-request unlock path free these retained file_lock objects directly. If a dependent waiter is still attached, locks_release_private() hits BUG_ON(!list_empty(&flc->flc_blocked_requests)). The same lifetime mismatch can leave a freed ksmbd_lock reachable through its request-local llist. Detach the file_lock from the blocked-request graph before freeing it in the close, cross-request unlock, and rollback paths. locks_delete_block() also wakes requests chained below the object. Remove llist when a completed lock is published so a globally visible ksmbd_lock no longer points into the submitting worker's stack.
CVE-2026-90155
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-2026-90155
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": "d63528eb0d43c4796c42aad56889dec12cf4e122",
"lessThan": "d20d3f6ad8b0b6f4e1bb32cdf7eca251962e8f04",
"versionType": "git"
},
{
"status": "affected",
"version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
"lessThan": "d31db79cfaa9fce6649772ad279779473ba8aef9",
"versionType": "git"
},
{
"status": "affected",
"version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
"lessThan": "f77d2accafca529e0ea3f979eb6e6cf1dac05c90",
"versionType": "git"
},
{
"status": "affected",
"version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
"lessThan": "514a0b2bc949963497e66cacd433f65dc768a71d",
"versionType": "git"
},
{
"status": "affected",
"version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
"lessThan": "215e8816b1ac25176d911abb8704390413ccee4b",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/server/smb2pdu.c",
"fs/smb/server/vfs_cache.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"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": [
"fs/smb/server/smb2pdu.c",
"fs/smb/server/vfs_cache.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90155
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48621 · Revision 1
- Added to Heist Feed
- Publisher date