iommufd: Set upper bounds on cache invalidation entry_num and entry_len

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64289
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:09 UTC
Updated2026-07-25 10:17:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iommufd: Set upper bounds on cache invalidation entry_num and entry_len iommufd_hwpt_invalidate() takes a user-controlled entry_num and entry_len, each bounded only by U32_MAX. An entry_len beyond the kernel's struct size makes the copy helper verify the extra bytes are zero, scanning that excess in one uninterruptible pass; a multi-gigabyte value over zeroed user memory trips the soft-lockup watchdog. A large entry_num is the other half, driving the backend invalidation loop with no reschedule. The VT-d nested handler, for one, copies each entry and flushes caches per iteration, pinning the CPU on a non-preemptible kernel. Cap both in the ioctl. entry_len is held under PAGE_SIZE, above any request struct, and entry_num under 1 << 19, the order of a hardware invalidation queue and well beyond any real batch, bounding the per-call loop length.

Risk And Classification

EPSS: 0.002090000 probability, percentile 0.111780000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8c6eabae3807e048b9f17733af5e20500fbf858c d2bd041e0efaf7d81789779b135279d18b33d6d5 git Not specified
CNA Linux Linux affected 8c6eabae3807e048b9f17733af5e20500fbf858c 32ca4aed2a66205b072fcfecabe220289a8149ff git Not specified
CNA Linux Linux affected 8c6eabae3807e048b9f17733af5e20500fbf858c 2c6381d90898089287e0a358f06f89f6b4b389f2 git Not specified
CNA Linux Linux affected 8c6eabae3807e048b9f17733af5e20500fbf858c 4d70986002f2f3eaaed89124fb2522bded38b016 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/32ca4aed2a66205b072fcfecabe220289a8149ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2bd041e0efaf7d81789779b135279d18b33d6d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c6381d90898089287e0a358f06f89f6b4b389f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d70986002f2f3eaaed89124fb2522bded38b016 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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