High severity · published May 6, 2026
CVE-2026-43239
smb: client: prevent races in ->query_interfaces()
8.8
CVSS
0.3%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: prevent races in ->query_interfaces()
It was possible for two query interface works to be concurrently trying
to update the interfaces.
Prevent this by checking and updating iface_last_update under
iface_lock.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.19.1 before 6.6.128; 6.7 before 6.12.75; 6.13 before 6.18.16; 6.19 before 6.19.6; 5.19; 5.19; +4 more · source: NVD
LI
Linux · Linux
aa45dadd34e44fcd6a9df4b395bee5b5633b4cec before 93e8e3ee165ae4609a1222b516b573837103d2c3; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec before ab6564f416a6eaf1199200b6100952407b438f7d; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec before 6287eefaf21ec805d42f941bd368018cf397a7f5; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec before 76cc4faba0343c6db945b8dc75425b33d633e1b8; aa45dadd34e44fcd6a9df4b395bee5b5633b4cec before c3c06e42e1527716c54f3ad2ced6a034b5f3a489; 5.19 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43239
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43239
Patch
https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5
Patch
https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8
Patch
https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3
Patch
https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d
Patch
https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489
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