High 7.8Published May 27, 2026

CVE-2026-46090ALSA: aloop: Fix peer runtime UAF during format-change stop

Updated under an hour ago (Oct 27, 2026, 1:10 AM ET)

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It affects Linux and 10 other products. Add what you run to find out whether that includes you.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix peer runtime UAF during format-change stop loopback_check_format() may stop the capture side when playback starts with parameters that no longer match a running capture stream. Commit 826af7fa62e3 ("ALSA: aloop: Fix racy access at PCM trigger") moved the peer lookup under cable->lock, but the actual snd_pcm_stop() still runs after dropping that lock. A concurrent close can clear the capture entry from cable->streams[] and detach or free its runtime while the playback trigger path still holds a stale peer substream pointer. Keep a per-cable count of in-flight peer stops before dropping cable->lock, and make free_cable() wait for those stops before detaching the runtime. This preserves the existing behavior while making the peer runtime lifetime explicit.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-364, CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	597603d615d2b19a9e451d8cfac24372856a522d builds before 83bd62fa9620ac98d5d694bde14c50f98c8e7189; 597603d615d2b19a9e451d8cfac24372856a522d builds before 345c24b2bcf0923dfae1ab41497351c68214ff76; 597603d615d2b19a9e451d8cfac24372856a522d builds before 3727a3541788412c393eec236ad228d72efe19c7; from 597603d615d2b19a9e451d8cfac24372856a522d before d258cdce50ff3e02392917258e81a0ce9555c327; 597603d615d2b19a9e451d8cfac24372856a522d builds before 03f52a9c170431e8f10e156b9dc0dae80b3e9198; from 597603d615d2b19a9e451d8cfac24372856a522d before bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c; 597603d615d2b19a9e451d8cfac24372856a522d builds before 5d45e34bf001344e2966dabca1897561bbc9e913; from 597603d615d2b19a9e451d8cfac24372856a522d before e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:6.12.0-211.29.1.el10_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:6.12.0-55.84.1.el10_0 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_extras_rt_els	from 0:3.10.0-1160.155.1.rt56.1307.el7 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 0:3.10.0-1160.154.1.el7 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_aus	from 0:4.18.0-305.197.1.el8_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life	from 0:4.18.0-305.197.1.el8_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service redhat:rhel_tus	from 0:4.18.0-477.150.1.el8_8 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions redhat:rhel_e4s	from 0:4.18.0-477.150.1.el8_8 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:5.14.0-570.125.1.el9_6 not affected	CISA ADP
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References

References

https://git.kernel.org/stable/c/83bd62fa9620ac98d5d694bde14c50f98c8e7189	patch
https://git.kernel.org/stable/c/345c24b2bcf0923dfae1ab41497351c68214ff76	patch
https://git.kernel.org/stable/c/3727a3541788412c393eec236ad228d72efe19c7
https://git.kernel.org/stable/c/d258cdce50ff3e02392917258e81a0ce9555c327
https://git.kernel.org/stable/c/03f52a9c170431e8f10e156b9dc0dae80b3e9198	patch
https://git.kernel.org/stable/c/bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c	patch
https://git.kernel.org/stable/c/5d45e34bf001344e2966dabca1897561bbc9e913	patch
https://git.kernel.org/stable/c/e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff	patch
https://access.redhat.com/errata/RHSA-2026:27353
https://access.redhat.com/errata/RHSA-2026:27354
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.