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CVE

CVE-2026-46195

smb: client: validate dacloffset before building DACL pointers
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CVE

CVE-2026-46195

smb: client: validate dacloffset before building DACL pointers

In the Linux kernel, the following vulnerability has been resolved:

smb: client: validate dacloffset before building DACL pointers

parsesecdesc(), buildsecdesc(), and the chown path in

idmodetocifsacl() 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

U32MAX, wrap the derived DACL pointer below endof_acl, and then slip

past the later pointer-based bounds checks. buildsecdesc() and

idmodetocifsacl() 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7, https://git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995, https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a, https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505, https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a, https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3, https://git.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0b, 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://access.redhat.com/security/cve/CVE-2026-46195, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46195.json, https://nvd.nist.gov/vuln/detail/CVE-2026-46195, https://bugzilla.redhat.com/show_bug.cgi?id=2482606, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00675%
EPSS Percentile
0.49506%
Introduced Version
bc3e9dd9d104ca1b75644eab87b38ce8a924aef4,5.12.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
f98b48151cc502ada59d9778f0112d21f2586ca3,5.15.210,6.1.176,6.6.140,6.12.88,6.18.30,7.0.7,0:4.18.0-553.126.1.el8_10,0:4.18.0-553.126.1.rt7.467.el8_10,0:5.14.0-687.12.1.el9_8,6.1.176-1,6.1.176-1~deb11u1,6.12.88-1,5.15.0-1111.118~20.04.1,5.15.0-1116.125~20.04.1,5.15.0-1111.121~20.04.1,5.15.0-185.195~20.04.1,5.15.0-1105.109~20.04.1,5.15.0-1106.112~20.04.1,5.15.0-183.193~20.04.1,5.15.0-1063.63~20.04.1,5.15.0-1108.114~20.04.1,6.8.0-134.134,6.8.0-1060.63,6.17.0-1019.19~24.04.1,6.8.0-1063.71,6.17.0-1021.21~24.04.1,6.8.0-1062.69,6.8.0-1063.69,6.17.0-1020.22~24.04.1,6.8.0-1058.64,6.8.0-1045.48,6.17.0-40.40~24.04.1,7.0.0-28.28~24.04.1,6.8.0-1060.61,6.8.0-134.134.1,6.8.0-1058.61,6.17.0-1026.26,6.8.0-1058.61.1,6.8.0-1029.30,6.17.0-1028.28,6.8.0-1057.58,6.17.0-1018.18~24.04.1,6.8.0-1060.64,6.8.0-1032.33,5.15.0-185.195,5.15.0-1111.118,6.8.0-1060.63~22.04.1,5.15.0-1116.125,6.8.0-1063.71~22.04.1,6.8.0-1062.69~22.04.1,5.15.0-1111.121,6.8.0-1063.69~22.04.1,5.15.0-1107.113,5.15.0-1094.102,6.8.0-136.136~22.04.1,5.15.0-1105.109,6.8.0-1060.61~22.04.1,5.15.0-1106.112,5.15.0-1103.108,5.15.0-183.193,6.8.0-134.134.1~22.04.1,5.15.0-1106.107,6.8.0-1058.61~22.04.1,5.15.0-1063.63,5.15.0-1052.52,5.15.0-1108.114,6.8.0-1057.58~22.04.1,5.15.0-1105.108,6.8.0-134.134~22.04.1,5.15.0-1074.78,0:5.14.0-687.17.1.el9_8,0:5.15.210-148.245.amzn2,0:1.0-0.amzn2,1:6.12.88-119.157.amzn2023,1:1.0-0.amzn2023,1:6.18.30-61.116.amzn2023,1:6.1.176-220.358.amzn2023

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