Critical severity · published May 27, 2026
CVE-2026-45972
smb: client: fix potential UAF and double free in smb2_open_file()
9.8
CVSS
0.3%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.1.163 before 6.1.165; 6.6.124 before 6.6.128; 6.12.70 before 6.12.75; 6.18.10 before 6.18.14; 6.19.1 before 6.19.4; 6.19 · source: NVD
LI
Linux · Linux
743f70406264348c0830f38409eb6c40a42fb2db before 96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74; 3a6d6b332f92990958602c1e35ce0173e2dd62e9 before 7425453ea16dbc3bbb0f6cac4d60b537e5e4d151; b64e3b5d8d759dd4333992e4ba4dadf9359952c8 before 4d339b219004869e96c4ce56b8891f83a38da4c0; 9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 before e66dcf7bb9c4df5582c82bc3582725abcbfbea73; e3a43633023e3cacaca60d4b8972d084a2b06236 before 639deb962986ef2f5e2a6d5a600c66f922471e81; e3a43633023e3cacaca60d4b8972d084a2b06236 before ebbbc4bfad4cb355d17c671223d0814ee3ef4eda; +5 more · source: vendor
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45972
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45972
Patch
https://git.kernel.org/stable/c/4d339b219004869e96c4ce56b8891f83a38da4c0
Patch
https://git.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81
Patch
https://git.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151
Patch
https://git.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74
Patch
https://git.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73
Patch
https://git.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4eda
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