CVE-2026-90155ksmbd: detach blocked lock requests before freeing
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 88% 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: 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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 43 days later
· 43 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected d63528eb0d43c4796c42aad56889dec12cf4e122 – < 4e8b69c06bd6583ec11abef4fae50c2c8d5f3679
- affected d63528eb0d43c4796c42aad56889dec12cf4e122 – < d20d3f6ad8b0b6f4e1bb32cdf7eca251962e8f04
- affected d63528eb0d43c4796c42aad56889dec12cf4e122 – < d31db79cfaa9fce6649772ad279779473ba8aef9
- affected d63528eb0d43c4796c42aad56889dec12cf4e122 – < f77d2accafca529e0ea3f979eb6e6cf1dac05c90
- affected d63528eb0d43c4796c42aad56889dec12cf4e122 – < 514a0b2bc949963497e66cacd433f65dc768a71d
- affected d63528eb0d43c4796c42aad56889dec12cf4e122 – < 215e8816b1ac25176d911abb8704390413ccee4b
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 6.18.57 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/4e8b69c06bd6583ec11abef4fae50c2c8d5f3679 (opens in a new tab)
- https://git.kernel.org/stable/c/d20d3f6ad8b0b6f4e1bb32cdf7eca251962e8f04 (opens in a new tab)
- https://git.kernel.org/stable/c/d31db79cfaa9fce6649772ad279779473ba8aef9 (opens in a new tab)
- https://git.kernel.org/stable/c/f77d2accafca529e0ea3f979eb6e6cf1dac05c90 (opens in a new tab)
- https://git.kernel.org/stable/c/514a0b2bc949963497e66cacd433f65dc768a71d (opens in a new tab)
- https://git.kernel.org/stable/c/215e8816b1ac25176d911abb8704390413ccee4b (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-2026-81748 (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-2026-90155)Record last updated .