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Review reviewCritical

CVE-2026-46195

Linux Linux, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9

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...

CVSS
9.8
EPSS
0.68%
48.6% percentile
CISA KEV
Not listed
Published
2026.05.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.68%
Technical severityCVSS 9.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9
Affected versions
>= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < 5de2665e913a10ad70aaeecf736b97276e83d995, >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < f9dc3be8f403c1216df73e57221f44b045e7ee0b, >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < ba7f71b6161c0943dafc367565e5843d16b7d505, >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7, >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < c688f3ed73d31943334ad2139cb02ec49664322a, >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < 8bd07e417b6bda67e317920584e48cb6ee442a8a, >= bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 < f98b48151cc502ada59d9778f0112d21f2586ca3, >= 5.12, >= 5.12 < 6.6.140, >= 6.7 < 6.12.88, >= 6.13 < 6.18.30, >= 6.19 < 7.0.7, 7.1
Fixed versions
6.6.140, 6.12.88, 6.18.30, 7.0.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-476, CWE-787