CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.
Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the data_offset bound in is_valid_oplock_break() Commit 83bfbd0bb902 ("cifs: Remove the RFC1002 header from smb_hdr") changed the quantity this bound is measured against. It used to be srv->total_read minus the 4-byte RFC1002 preamble that total_read then included, so it was the SMB message length. The same commit stopped counting the preamble, and the mechanical substitution to srv->total_read - srv->pdu_size left an expression that is identically zero: standard_receive3() reads MID_HEADER_SIZE() bytes and then exactly pdu_length - MID_HEADER_SIZE() more, adding both to total_read. len is therefore 0, the subtraction below it wraps, and no __u32 DataOffset can exceed the result, so the check from commit 097f5863b1a0 ("cifs: read overflow in is_valid_oplock_break()") no longer rejects anything. Use total_read, which is now the message length on its own.
Засегнати продукти
- Linux Linux: 83bfbd0bb9025f98fa62b44f93bd67466773d1db преди 5b16a1967a01ad4496a7206a87c3eb16f1df2b05; 83bfbd0bb9025f98fa62b44f93bd67466773d1db преди ba22f575de9deeae4ae0859ca4315a7698226237; 78e718c5aa146063cd70d2cc68297c3ac41f31ee; 6.18.56 преди 6.19
- Linux Linux: 6.19; преди 6.19; 7.2.4 до 7.2.*; 7.3 до *
История
- 11 септември 2026 Публикувано