Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building DACL pointers parse_sec_desc(), build_sec_desc(), and the chown path in id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd before proving a DACL header fits inside the returned security descriptor. On 32-bit builds a malicious server can return dacloffset near U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip past the later pointer-based bounds checks. build_sec_desc() and id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped pointer in the chmod/chown rewrite paths. Validate dacloffset numerically before building any DACL pointer and reuse the same helper at the three DACL entry points.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < 5de2665e913a10ad70aaeecf736b97276e83d995affectedbc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < f9dc3be8f403c1216df73e57221f44b045e7ee0baffectedbc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < ba7f71b6161c0943dafc367565e5843d16b7d505affectedbc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7affectedbc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < c688f3ed73d31943334ad2139cb02ec49664322aaffectedbc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < 8bd07e417b6bda67e317920584e48cb6ee442a8aaffectedbc3e9dd9d104ca1b75644eab87b38ce8a924aef4 to < f98b48151cc502ada59d9778f0112d21f2586ca3affected
Linux Linux
Default version status: affected
5.12affected0 to < 5.12unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.140 to ≤ 6.6.*unaffected6.12.88 to ≤ 6.12.*unaffected6.18.30 to ≤ 6.18.*unaffected7.0.7 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995 ↗
- https://git.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0b ↗
- https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505 ↗
- https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7 ↗
- https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a ↗
- https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a ↗
- https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3 ↗
- https://access.redhat.com/security/cve/CVE-2026-46195 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2482606 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46195.json ↗
- https://access.redhat.com/errata/RHSA-2026:21556 ↗
- https://access.redhat.com/errata/RHSA-2026:21706 ↗
- https://access.redhat.com/errata/RHSA-2026:21745 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗