Critical severity · published Sep 11, 2026
CVE-2026-89636
smb: client: clear ce->tgthint in free_tgts()
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: clear ce->tgthint in free_tgts()
When free_tgts() frees all structures in ce->tlist, ce->tgthint
is left pointing to one of the freed cache_dfs_tgt structures.
If ce->tgthint is not reset before it is used later, it results
in a use-after-free.
Set ce->tgthint to NULL in free_tgts() after the elements are
freed to reflect that no elements remain.
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)0.7% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
54be1f6c1c37498bba557049df646cc239fa37e3 before 14f60e959b5ac813715ff72e127beb3584ddabf6; 54be1f6c1c37498bba557049df646cc239fa37e3 before 3ff9462bb7a06d8d32a1dc02d39580b078ec9e55; 54be1f6c1c37498bba557049df646cc239fa37e3 before 7507bd1885643d0461a6017767492450af1ce2a3; 54be1f6c1c37498bba557049df646cc239fa37e3 before 9ab46a13798a61d9d020b01d4e57efdabe6624fa; 54be1f6c1c37498bba557049df646cc239fa37e3 before 5baab40404a9393bcc0b7b8f1950bf2c307e0984; 54be1f6c1c37498bba557049df646cc239fa37e3 before b1b741cf8e7ce1b91d937e23decd3d3358748700; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89636
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89636
git.kernel.org
https://git.kernel.org/stable/c/14f60e959b5ac813715ff72e127beb3584ddabf6
git.kernel.org
https://git.kernel.org/stable/c/3ff9462bb7a06d8d32a1dc02d39580b078ec9e55
git.kernel.org
https://git.kernel.org/stable/c/5baab40404a9393bcc0b7b8f1950bf2c307e0984
git.kernel.org
https://git.kernel.org/stable/c/7507bd1885643d0461a6017767492450af1ce2a3
git.kernel.org
https://git.kernel.org/stable/c/9ab46a13798a61d9d020b01d4e57efdabe6624fa
git.kernel.org
https://git.kernel.org/stable/c/b1b741cf8e7ce1b91d937e23decd3d3358748700
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