CVE-2026-46195

CRITICAL EPSS 41.3%
Published May 28, 20261mo ago · Modified Jun 19, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published May 28, 2026 1mo ago
Last Modified Jun 19, 2026 1w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
41.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.12  –  <6.6.140
linuxlinux_kernel*≥6.7  –  <6.12.88
linuxlinux_kernel*≥6.13  –  <6.18.30
linuxlinux_kernel*≥6.19  –  <7.0.7
linuxlinux_kernel7.1any
linuxlinux_kernel7.1any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995
  • git.kernel.org https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0b

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3
    Patch