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CVE-2026-31709: Linux, грешка в паметта

8.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се по мрежата, без особени условия, без вход и след действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incoming ACL to rebuild the chmod/chown security descriptor. The original fix only checked that the struct smb_acl header fits before reading dacl_ptr->size or dacl_ptr->num_aces. That avoids the immediate header-field OOB read, but the rewrite helpers still walk ACEs based on pdacl->num_aces with no structural validation of the incoming DACL body. A malicious server can return a truncated DACL that still contains a header, claims one or more ACEs, and then drive replace_sids_and_copy_aces() or set_chmod_dacl() past the validated extent while they compare or copy attacker-controlled ACEs. Factor the DACL structural checks into validate_dacl(), extend them to validate each ACE against the DACL bounds, and use the shared validator before the chmod/chown rebuild paths. parse_dacl() reuses the same validator so the read-side parser and write-side rewrite paths agree on what constitutes a well-formed incoming DACL.

Засегнати продукти

  • Linux Linux: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди b8603d9ae6c9087662b098619996bc4a8064319d; bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди c2abdebf72000a64603ced84d36ccbd164f11391; bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди 8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12; bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди d92f3f0b22414e7515696a02224d0af55e3004a3; bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5; bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди b78db9bddc84136f6a0bb49e8883cf200dfb87a8; bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 преди 0a8cf165566ba55a39fd0f4de172119dd646d39a
  • Linux Linux: 5.12; преди 5.12; 5.15.210 до 5.15.*; 6.1.176 до 6.1.*; 6.6.140 до 6.6.*; 6.12.86 до 6.12.*; 6.18.35 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии
  • Red Hat: още 9 продукта, добавени от Red Hat

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7

Вид слабост

История

  • 1 май 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-31709: Linux, грешка в паметта | freedomonline.bg