CVE-2026-63909

Status: UPDATED  |  Advisory ID: CVE-2026-63909

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

ksmbd: OOB read regression in smb_check_perm_dacl() ACE-walk loops

Commit d07b26f39246 ("ksmbd: require minimum ACE size in

smb_check_perm_dacl()") introduced a transposed bounds check:

if (offsetof(struct smb_ace, sid) + aces_size < CIFS_SID_BASE_SIZE)

Since offsetof(..sid) is 8 and CIFS_SID_BASE_SIZE is 8, this evaluates

to `aces_size < 0`. Because `aces_size` is always non-negative, this

check becomes dead code and never breaks the loop.

Worse, that commit removed the old 4-byte guard, meaning the loop now

reads `ace->size` (offset 2) even when `aces_size` is 0-3 bytes. This

re-opens a 2-byte heap out-of-bounds (OOB) read past the pntsd allocation

during subsequent SMB2_CREATE operations.

Fix this by properly transposing the comparison to require at least

16 bytes (8-byte offset + 8-byte SID base), matching the correct form

used in smb_inherit_dacl(). (NVD)

What to Do

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

References