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Vulnerability record · CVE-2026-46047 · published 27 May 2026

CVE-2026-46047: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-46047), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.