CVE-2026-89450: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field tegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH, whose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag. The HW therefore matches only a 20-bit Stream ID. The bound check rejects only virt_sid > UINT_MAX, which admits a value far wider than the field. The write "virt_sid << 1 | 0x1" then drops every bit above 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match on vSID 0, so the entry aliases the wrong Stream ID. Because vdev->virt_id is guest-controlled, a VMM can trigger it. Validate virt_sid against the field width with FIELD_MAX(), and program the register with FIELD_PREP() so the value and the field stay consistent.

Засегнати продукти

• Linux Linux: 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 преди d903d99ffd22b0180bd745a43f221c21bcdd8d7c; 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 преди 445204550f894ca325ac80a21e3df177ad073798; 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 преди 4379610c79bd88ddbea10e7f6c21e16d4b338c6b
• Linux Linux: 6.17; преди 6.17; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-89450
• https://nvd.nist.gov/vuln/detail/CVE-2026-89450
• https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c
• https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798
• https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b