CVE-2026-43459
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).
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.170-1 |
| debian | bullseye | fixed | 5.10.257-1 |
| debian | forky | fixed | 6.19.10-1 |
| debian | sid | fixed | 6.19.10-1 |
| debian | trixie | fixed | 6.12.85-1 |
| linux-kernel | affected | 5.10.253 | |
| linux-kernel | 7.0 | affected | |
References
- https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007
- https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf
- https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a
- https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb
- https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b
- https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c
- https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd
- https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8
- https://www.suse.com/security/cve/CVE-2026-43459.html
- https://security-tracker.debian.org/tracker/CVE-2026-43459
CWEs
CWE-416
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.