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CVE-2026-45972

Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.

CVSS
9.8
EPSS
0.33%
25.9% percentile
CISA KEV
Not listed
Published
2026.05.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.33%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open() to prevent an UAF bug if @data != NULL, otherwise a double free.

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions
>= 743f70406264348c0830f38409eb6c40a42fb2db < 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74, >= 3a6d6b332f92990958602c1e35ce0173e2dd62e9 < 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151, >= b64e3b5d8d759dd4333992e4ba4dadf9359952c8 < 4d339b219004869e96c4ce56b8891f83a38da4c0, >= 9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 < e66dcf7bb9c4df5582c82bc3582725abcbfbea73, >= e3a43633023e3cacaca60d4b8972d084a2b06236 < 639deb962986ef2f5e2a6d5a600c66f922471e81, >= e3a43633023e3cacaca60d4b8972d084a2b06236 < ebbbc4bfad4cb355d17c671223d0814ee3ef4eda, >= 6.1.163 < 6.1.165, >= 6.6.124 < 6.6.128, >= 6.12.70 < 6.12.75, >= 6.18.10 < 6.18.14, >= 6.19, >= 6.19.1 < 6.19.4, 6.19
Fixed versions
6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4

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 10, Red Hat Enterprise Linux 6 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-416, CWE-825