CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: validate offshift to prevent shift-out-of-bounds u32_change() copies the user-provided tc_u32_sel.offshift (unsigned char, 0-255) into the kernel knode object without bounds validation. When a packet later hits u32_classify() with TC_U32_VAROFFSET set, it evaluates `ntohs(offmask & *data) >> offshift` where the left operand is a 16-bit value promoted to a 32-bit int. Any offshift >= 32 is undefined behavior per C11 6.5.7p3, triggerable by an unprivileged user via user/network namespaces. UBSAN: shift-out-of-bounds in net/sched/cls_u32.c:236:43 shift exponent 32 is too large for 32-bit type int Fix this by rejecting offshift >= 16 during filter creation in u32_change().
Засегнати продукти
- Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 7fd5b2287e5cf33e114fb7f0cef781a546039757; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 724c8edbacf1259988829cb9967f751222121d8a; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 006a4598da9a6b02e0ddc3ca5042b97224774364; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 9990cac513e8b191de2ee589051ea7ebf3cee940; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 313cb9ffc4101a885d791facf4b5ea3d5e06144d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди aef96eead2860cbfa371e4471d4f04412213b958
- Linux Linux: 2.6.12; преди 2.6.12; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.57 до 6.18.*; 7.1.8 до 7.1.*; 7.2 до *
История
- 15 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-74544
- https://nvd.nist.gov/vuln/detail/CVE-2026-74544
- https://git.kernel.org/stable/c/7fd5b2287e5cf33e114fb7f0cef781a546039757
- https://git.kernel.org/stable/c/724c8edbacf1259988829cb9967f751222121d8a
- https://git.kernel.org/stable/c/006a4598da9a6b02e0ddc3ca5042b97224774364
- https://git.kernel.org/stable/c/9990cac513e8b191de2ee589051ea7ebf3cee940
- https://git.kernel.org/stable/c/313cb9ffc4101a885d791facf4b5ea3d5e06144d
- https://git.kernel.org/stable/c/aef96eead2860cbfa371e4471d4f04412213b958