UAF in Linux Kernel ASoC: flush delayed work before DAI removal
CVE-2026-43459 Published on May 8, 2026
ASoC: soc-core: flush delayed work before removing DAIs and widgets
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).
Products Associated with CVE-2026-43459
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Affected Versions
Linux:- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below bf80a89da97285d9b877e0c6995e870d46b8025c is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below 3887e514978d28216246360b46a9cb534969eb5a is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below 231568afbc0cd25b8fb2a94ebf9738eabe1cf007 is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below 317a9298c54bb00319da73e5a7179f00e67fcbdf is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below eab71e11ce2447c1e01809cbc11eab4234cf8dc8 is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below 7d33e6140945482a07f8089ee86e13e02553ffdb is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below c054f0607c8bb1b1aa529bc109e4149298a1cccd is affected.
- Version e894efef9ac7c10b7727798dcc711cccf07569f9 and below 95bc5c225513fc3c4ce169563fb5e3929fbb938b is affected.
- Version 4.20 is affected.
- Before 4.20 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.167, <= 6.1.* is unaffected.
- Version 6.6.130, <= 6.6.* is unaffected.
- Version 6.12.78, <= 6.12.* is unaffected.
- Version 6.18.19, <= 6.18.* is unaffected.
- Version 6.19.9, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.