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CVE-2026-72382: Linux

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, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: reject undersized DACLs before parsing ACEs parse_dacl() limits the attacker-controlled ACE count by comparing it with the number of minimal ACEs that fit in the DACL size. The DACL size field is 16 bits, but the expression subtracts sizeof(struct smb_acl). Because sizeof() is unsigned, a DACL size smaller than the ACL header underflows to a large size_t. A malicious client can reach this with: SMB2_SET_INFO (InfoType=SMB2_O_INFO_SECURITY) -> smb2_set_info_sec() -> set_info_sec() -> parse_sec_desc() -> parse_dacl() -> init_acl_state(..., 0xffff) -> init_acl_state(..., 0xffff) -> kmalloc_objs(..., 0xffff) Thus a malformed security descriptor can make num_aces pass the guard and drive large temporary ACL state and pointer-array allocations. Reject DACLs smaller than struct smb_acl before doing the subtraction, so the ACE count check cannot be bypassed by the underflow.

    Засегнати продукти

    • Linux Linux: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 8dc949061e35427433feac3ebe5ec089f2aa857e; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 16fb65ec15fe7c90f50a2115854bfd9a032d4023; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 282847c0cf22f2e961155ac8e42f6eeab7e16049; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди d020e7f27bf65eecd3805404702f716b2b6d9e73; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 60908f7ebcd9b6cde74ad5711fab0f49c7970949
    • Linux Linux: 5.15; преди 5.15; 6.1.191 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

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    Първоизточници

    CVE-2026-72382: Linux | freedomonline.bg