CVE-2026-97555 Linux Kernel smb client - Buffer Overflow

Linux kernel smb client contains a heap overflow caused by insufficient buffer allocation during DACL owner/group SID rewrite in id_mode_to_cifs_acl, letting attackers cause out-of-bounds write, exploit requires crafted DACL with short original SIDs and longer replacement SIDs.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.52% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for this heap overflow.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs