CVE-2026-99110

Status: UPDATED  |  Advisory ID: CVE-2026-99110

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix heap overflow in cifs_do_set_acl()

cifs_set_acl() validates ACL size using posix_acl_xattr_size():

4 + (count * 8) // 4-byte header + 8 bytes per ACE

cifs_do_set_acl() then calls posix_acl_to_cifs() to write the CIFS

wire format into the same buffer:

6 + (count * 10) // 6-byte header + 10 bytes per ACE

An ACL that passes the xattr-based check in cifs_set_acl() can

overflow the heap when posix_acl_to_cifs() writes the larger CIFS

format.

Validate the CIFS format size against the remaining buffer space and

USHRT_MAX before converting--data_count is __u16, so sizes above

USHRT_MAX truncate the on-wire packet length, causing the server to

apply a partial ACL. Replace MaxDataCount = 1000 with

min(CIFSMaxBufSize, USHRT_MAX). (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References