# CVE-2025-40155: linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/vt-d: debugfs: Fix legacy mode page table...

CVE-2025-40155 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-40155, released November 12, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-40155
- Priority: High
- CVSS: 7.3 (high)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 12, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  iommu/vt-d: debugfs: Fix legacy mode page table dump logic  In legacy mode, SSPTPTR is ignored if TT is not 00b or 01b. SSPTPTR maybe uninitialized or zero in that case and may cause oops like:   Oops: general protection fault, probably for non-canonical address        0xf00087d3f000f000: 0000 [#1] SMP NOPTI  CPU: 2 UID: 0 PID: 786 Comm: cat Not tainted 6.16.0 #191 PREEMPT(voluntary)  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-5.fc42 04/01/2014  RIP: 0010:pgtable_walk_level+0x98/0x150  RSP: 0018:ffffc90000f279c0 EFLAGS: 00010206  RAX: 0000000040000000 RBX: ffffc90000f27ab0 RCX: 000000000000001e  RDX: 0000000000000003 RSI: f00087d3f000f000 RDI: f00087d3f0010000  RBP: ffffc90000f27a00 R08: ffffc90000f27a98 R09: 0000000000000002  R10: 0000000000000000 R11: 0000000000000000 R12: f00087d3f000f000  R13: 0000000000000000 R14: 0000000040000000 R15: ffffc90000f27a98  FS:  0000764566dcb740(0000) GS:ffff8881f812c000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 0000764566d44000 CR3: 0000000109d81003 CR4: 0000000000772ef0  PKRU: 55555554  Call Trace:   <TASK>   pgtable_walk_level+0x88/0x150   domain_translation_struct_show.isra.0+0x2d9/0x300   dev_domain_translation_struct_show+0x20/0x40   seq_read_iter+0x12d/0x490 ...  Avoid walking the page table if TT is not 00b or 01b.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.57-1 | [DEBIAN-CVE-2025-40155](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40155.md) | Nov 12, 2025 |
| Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40155](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40155.md) | Nov 12, 2025 |

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