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Vulnerability record · CVE-2026-43459 · published 8 May 2026

CVE-2026-43459: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ASoC: soc-core: flush delayed work before removing DAIs and widgets When a sound card is unbound while a PCM stream is open, a use-after-free can occur in snd_soc_dapm_stream_event(), called from the close_delayed_work workqueue handler. During unbind, snd_soc_unbind_card() flushes delayed work and then calls soc_cleanup_card_resources(). Inside cleanup, snd_card_disconnect_sync() releases all PCM file descriptors, and the resulting PCM close path can call snd_soc_dapm_stream_stop() which schedules new delayed work with a pmdown_time timer delay. Since this happens after the flush in snd_soc_unbind_card(), the new work is not caught. soc_remove_link_components() then frees DAPM widgets before this work fires, leading to the use-after-free. The existing flush in soc_free_pcm_runtime() also cannot help as it runs after soc_remove_link_components() has already freed the widgets. Add a flush in soc_cleanup_card_resources() after snd_card_disconnect_sync() (after which no new PCM closes can schedule further delayed work) and before soc_remove_link_dais() and soc_remove_link_components() (which tear down the structures the delayed work accesses).

7.3 CVSS 3.1 High EPSS 0.17% · top 94.9% CWE-416 · Use after free
7.3CVSS 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: ASoC: soc-core: flush delayed work before removing DAIs and widgets When a sound card is unbound while a PCM stream is open, a use-after-free can occur in snd_soc_dapm_stream_event(), called from the close_delayed_work workqueue handler. During unbind, snd_soc_unbind_card() flushes delayed work and then calls soc_cleanup_card_resources(). Inside cleanup, snd_card_disconnect_sync() releases all PCM file descriptors, and the resulting PCM close path can call snd_soc_dapm_stream_stop() which schedules new delayed work with a pmdown_time timer delay. Since this happens after the flush in snd_soc_unbind_card(), the new work is not caught. soc_remove_link_components() then frees DAPM widgets before this work fires, leading to the use-after-free. The existing flush in soc_free_pcm_runtime() also cannot help as it runs after soc_remove_link_components() has already freed the widgets. Add a flush in soc_cleanup_card_resources() after snd_card_disconnect_sync() (after which no new PCM closes can schedule further delayed work) and before soc_remove_link_dais() and soc_remove_link_components() (which tear down the structures the delayed work accesses).

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/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/231568afbc0cd25b8fb2a94ebf9738eabe1cf007 Patch
https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf Patch
https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a Patch
https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb Patch
https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b Patch
https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c Patch
https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd Patch
https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43459), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.