CVE-2026-64289
CVE CVE-2026-64289EUVD EUVD-2026-49001Published 2026-07-25T08:49:29.000Z
What the advisory describes
In 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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.12.96; patch: 7.2-rc1; 8c6eabae3807e048b9f17733af5e20500fbf858c <32ca4aed2a66205b072fcfecabe220289a8149ff; 8c6eabae3807e048b9f17733af5e20500fbf858c <2c6381d90898089287e0a358f06f89f6b4b389f2; 8c6eabae3807e048b9f17733af5e20500fbf858c <4d70986002f2f3eaaed89124fb2522bded38b016; 8c6eabae3807e048b9f17733af5e20500fbf858c <d2bd041e0efaf7d81789779b135279d18b33d6d5; patch: 6.18.39; 6.8; patch: 0; patch: 7.1.4
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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