CVE ID :CVE-2026-64186<\/p>\n
Published : July 19, 2026, 4:18 p.m. | 1\u00a0hour, 23\u00a0minutes ago<\/p>\n
Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
iommu\/amd: Remove latent out-of-bounds access in IOMMU debugfs<\/p>\n
In iommu_mmio_write() and iommu_capability_write(), the variables
\ndbg_mmio_offset and dbg_cap_offset are declared as int. However, they
\nare populated using kstrtou32_from_user(). If a user provides a
\nsufficiently large value, it can become a negative integer.<\/p>\n
Prior to this patch, the AMD IOMMU debugfs implementation was already
\nprotected by different mechanisms.<\/p>\n
1. #define OFS_IN_SZ 8 ensures the user string OFS_IN_SZ)
\n return -EINVAL;<\/p>\n
2. Implicit type promotion in iommu_mmio_write(), dbg_mmio_offset is int
\n and iommu->mmio_phys_end is u64<\/p>\n
if (dbg_mmio_offset > iommu->mmio_phys_end – sizeof(u64))
\n return -EINVAL;<\/p>\n
3. The show handlers would currently catch the negative number and
\n refuse to perform the read.<\/p>\n
Replace kstrtou32_from_user() with kstrtos32_from_user() to parse the
\ninput, and check for negative values to explicitly prevent out-of-bounds
\nmemory accesses directly in iommu_mmio_write() and
\niommu_capability_write().<\/p>\n
Severity: 0.0 | NA<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID :CVE-2026-64186 Published : July 19, 2026, 4:18 p.m. | 1\u00a0hour, 23\u00a0minutes ago Description :In the Linux kernel, the following vulnerability has been resolved: iommu\/amd: Remove latent out-of-bounds access in IOMMU debugfs In iommu_mmio_write() and iommu_capability_write(), the variables dbg_mmio_offset and dbg_cap_offset are declared as int. However, they are populated using kstrtou32_from_user(). If a user …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82254","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82254","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82254"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82254\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82254"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82254"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}