01 Record

CVE-2026-45972

smb: client: fix potential UAF and double free in smb2_open_file()

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

smb: client: fix potential UAF and double free in smb2_open_file()

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.32% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 25.7% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-19.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-05-27 12:18Z5 MO AGO

Last updated

2026-10-19 19:26Z9 DAYS AGO

Reserved

2026-05-13

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-825Expired Pointer DereferenceBase
CWE-416Use After FreeVariant

Data version

5.2

Document digest

c36e62ec14de3556bf34dd3601853a4ad638ccac624fe85ff2962c3b956e5c84

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux743f70406264348c0830f38409eb6c40a42fb2db to < 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74, 3a6d6b332f92990958602c1e35ce0173e2dd62e9 to < 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151, b64e3b5d8d759dd4333992e4ba4dadf9359952c8 to < 4d339b219004869e96c4ce56b8891f83a38da4c0, 9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 to < e66dcf7bb9c4df5582c82bc3582725abcbfbea73, e3a43633023e3cacaca60d4b8972d084a2b06236 to < 639deb962986ef2f5e2a6d5a600c66f922471e81, e3a43633023e3cacaca60d4b8972d084a2b06236 to < ebbbc4bfad4cb355d17c671223d0814ee3ef4eda, 6.1.163 to < 6.1.165, 6.6.124 to < 6.6.128, 6.12.70 to < 6.12.75, 6.18.10 to < 6.18.14, 6.19—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74
git.kernel.orghttps://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151
git.kernel.orghttps://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0
git.kernel.orghttps://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73
git.kernel.orghttps://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81
git.kernel.orghttps://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda
access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-45972vdb-entryx_refsource_REDHAT
bugzilla.redhat.comRHBZ#2481973https://bugzilla.redhat.com/show_bug.cgi?id=2481973issue-trackingx_refsource_REDHAT
security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45972.jsonx_sadp-csaf-vex

07 Fixed in

Debian 12

linux
Fixed in 6.1.170-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.85-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.18.14-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.