Skip to content
CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-31704

ksmbd: use check_add_overflow() to prevent u16 DACL size overflow

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use check_add_overflow() to prevent u16 DACL size overflow set_posix_acl_entries_dacl() and set_ntacl_dacl() accumulate ACE sizes in u16 variables. When a file has many POSIX ACL entries, the accumulated size can wrap past 65535, causing the pointer arithmetic (char *)pndace + *size to land within already-written ACEs. Subsequent writes then overwrite earlier entries, and pndacl->size gets a truncated value. Use check_add_overflow() at each accumulation point to detect the wrap before it corrupts the buffer, consistent with existing check_mul_overflow() usage elsewhere in smbacl.c.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 41e53a773db6342ac9a689ee5ba635c31744c9f0affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 8d5729350b236896f51379588d9a690b7fafb8dbaffected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < e1955a94b6f17f4b058afa955a6f187eb3ed7615affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7affected
  • e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to < 299f962c0b02d048fb45d248b4da493d03f3175daffected

Linux Linux

Default version status: affected

  • 5.15affected
  • 0 to < 5.15unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.136 to ≤ 6.6.*unaffected
  • 6.12.84 to ≤ 6.12.*unaffected
  • 6.18.25 to ≤ 6.18.*unaffected
  • 7.0.2 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References