Out-of-bounds Write Affecting python3-perf package, versions <0:4.18.0-553.126.1.el8_10


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
0.5% (39th percentile)

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  • Snyk IDSNYK-CENTOS8-PYTHON3PERF-17076785
  • published29 May 2026
  • disclosed28 May 2026

Introduced: 28 May 2026

NewCVE-2026-46195  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Centos:8 python3-perf to version 0:4.18.0-553.126.1.el8_10 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3-perf package and not the python3-perf package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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 Base Scores

version 3.1