CVE-2021-47035
What it is
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Remove WO permissions on second-level paging entries When the first level page table is used for IOVA translation, it only supports Read-Only and Read-Write permissions. The Write-Only permission is not supported as the PRESENT bit (implying Read permission) should always set. When using second level, we still give separate permissions that allows WriteOnly which seems inconsistent and awkward. We want to have consistent behavior. After moving to 1st level, we don't want things to work sometimes, and break if we use 2nd level for the same mappings. Hence remove this configuration.
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 0.3% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.3% in the next 30 days (EPSS).
- Severity: 8.8 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.3% · EPSS, next 30 days
- Record status
- Modified
Affected
- Linux Kernel < 5.10.37
- Linux Kernel < 5.11.21
- Linux Kernel < 5.12.4
Attack profile CVSS 3.1 · 8.8
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2021-47035.md and follow it. Check whether this project is affected by CVE-2021-47035. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0
- https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20
- https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2
- https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c
- https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0
- https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20
- https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2
- https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3
- https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c
References
- https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0
- https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20
- https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2
- https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c
- https://git.kernel.org/stable/c/25faff78138933244c678c7fc78f7c0340fa04a0
- https://git.kernel.org/stable/c/66c24699f266ff310381a9552d3576eea8ad6e20
- https://git.kernel.org/stable/c/89bd620798704a8805fc9db0d71d7f812cf5b3d2
- https://git.kernel.org/stable/c/c848416cc05afc1589edba04fe00b85c2f797ee3
- https://git.kernel.org/stable/c/eea53c5816889ee8b64544fa2e9311a81184ff9c