CVE-2026-90153
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size
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
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 8f0541186e9ad1b62accc9519cc2b7a7240272a7 | affected | git | a2051ffe452afad52f580b85a3fd8851933b1e7c | Unavailable | None listed |
| 8f0541186e9ad1b62accc9519cc2b7a7240272a7 | affected | git | a29f57a14c939586d84d7fd6a029bd1fd170098f | Unavailable | None listed |
| 8f0541186e9ad1b62accc9519cc2b7a7240272a7 | affected | git | a4a307d149327dad5fb25187e1b03cebd1b04de6 | Unavailable | None listed |
| 8f0541186e9ad1b62accc9519cc2b7a7240272a7 | affected | git | 8e4f75e979c1d9a51b0a48ac33d0cfd5f039ec67 | Unavailable | None listed |
| 8f0541186e9ad1b62accc9519cc2b7a7240272a7 | affected | git | 79decd88dd3f0d42e7fb0689b1a7853bfa302459 | Unavailable | None listed |
| cb69d4d6f709f87c94afa28ae64c501576692171 | affected | git | Unavailable | Unavailable | None listed |
| 6e8f4abf584253cbaa596ea4ad13110cf61cd4c9 | affected | git | Unavailable | Unavailable | None listed |
| 8e33102309bd6839b2e2e158f93a7b378cb4655d | affected | git | Unavailable | Unavailable | None listed |
| 5.15.62 | affected | semver | 5.16 | Unavailable | None listed |
| 5.18.18 | affected | semver | 5.19 | Unavailable | None listed |
| 5.19.2 | affected | semver | 5.20 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.0 | Unavailable | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.110 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.52 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.6 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |