Answer in brief
CVE-2026-90153 records a Unknown severity vulnerability in ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8f0541186e9ad1b62accc9519cc2b7a7240272a7 <a2051ffe452afad52f580b85a3fd8851933b1e7c || >=8f0541186e9ad1b62accc9519cc2b7a7240272a7 <a29f57a14c939586d84d7fd6a029bd1fd170098f || >=8f0541186e9ad1b62accc9519cc2b7a7240272a7 <a4a307d149327dad5fb25187e1b03cebd1b04de6 || >=8f0541186e9ad1b62accc9519cc2b7a7240272a7 <8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67 || >=8f0541186e9ad1b62accc9519cc2b7a7240272a7 <79decd88dd3f0d42e7fb0689b1a7853bfa302459 || cb69d4d6f709f87c94afa28ae64c501576692171 || 6e8f4abf584253cbaa596ea4ad13110cf61cd4c9 || 8e33102309bd6839b2e2e158f93a7b378cb4655d || >=5.15.62 <5.16 || >=5.18.18 <5.19 || >=5.19.2 <5.20 | a2051ffe452afad52f580b85a3fd8851933b1e7c, a29f57a14c939586d84d7fd6a029bd1fd170098f, a4a307d149327dad5fb25187e1b03cebd1b04de6, 8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67, 79decd88dd3f0d42e7fb0689b1a7853bfa302459, 5.16, 5.19, 5.20 |
| Linux/Linuxgeneric | 6.0 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size smb_check_perm_dacl() validates that the DACL fits inside the NT security descriptor, but then bounds its two ACE walks by the remaining NTSD length (acl_size) rather than the DACL's declared size (pdacl_size). When pdacl->size is smaller than the trailing NTSD buffer, bytes after the declared DACL boundary - still inside the stored security descriptor - are parsed as ACEs during access checks. A crafted DACL can place an access-granting ACE beyond pdacl->size, and the current code accepts it during SMB2_CREATE access validation, while parse_dacl() and smb_inherit_dacl() stop at pdacl_size. Bound both ACE walks by pdacl_size to match the DACL boundary semantics used elsewhere in the server. Validation: - semantic KUnit harness shows the post-boundary ACE is selected before the fix and rejected (EACCES) after it - linux master (7.2-rc6), x86_64
Quoted source text, attributed separately from HOL analysis.