--- id: CVE-2026-68200 title: >- kernel: Linux kernel: ALSA timer use-after-free vulnerability allows privilege escalation (CVE-2026-68200) summary: >- A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) timer component. A lack of serialization in the userspace-driven timer (utimer) TRIGGER ioctl allows two threads to concurrently call snd_timer_interrupt(). Th… severity: high cvss: 7.8 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H' cvssSource: vendor cwe: CWE-364 vendor: Red Hat product: Red Hat Enterprise Linux BaseOS (v. 10) affected: - enterprise_linux 9 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_eus_v_10_0 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_9 - enterprise_linux_codeready_linux_builder_eus_v_10_0 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_codeready_linux_builder_v_9 - enterprise_linux_real_time_for_nfv_eus_v_10_0 - enterprise_linux_real_time_for_nfv_v_10 - enterprise_linux_real_time_for_nfv_v_9 - enterprise_linux_real_time_eus_v_10_0 - enterprise_linux_real_time_v_10 - enterprise_linux_real_time_v_9 patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_eus_v_10_0 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_9 - enterprise_linux_codeready_linux_builder_eus_v_10_0 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_codeready_linux_builder_v_9 - enterprise_linux_real_time_for_nfv_eus_v_10_0 - enterprise_linux_real_time_for_nfv_v_10 - enterprise_linux_real_time_for_nfv_v_9 - enterprise_linux_real_time_eus_v_10_0 - enterprise_linux_real_time_v_10 - enterprise_linux_real_time_v_9 published: '2026-08-10' updated: '2026-10-23' sourceUpdated: '2026-10-23T19:18:14+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68200.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68200.json - url: 'https://access.redhat.com/security/cve/CVE-2026-68200' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2513171' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-68200' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68200' - url: >- https://lore.kernel.org/linux-cve-announce/2026081011-CVE-2026-68200-1865@gregkh/T - url: 'https://access.redhat.com/errata/RHSA-2026:88687' - url: 'https://access.redhat.com/errata/RHSA-2026:68507' - url: 'https://access.redhat.com/errata/RHSA-2026:68570' - url: 'https://git.kernel.org/stable/c/996c24377eea4d4506b7c3ccbbf1e490440b5e0b' - url: 'https://git.kernel.org/stable/c/1395327a96614885552bae5fbb650e6dd182d49b' - url: 'https://git.kernel.org/stable/c/c1078130a4cd7e738f4b73afe99b3e68cbfbf884' - url: 'https://git.kernel.org/stable/c/70d28bfcd6224eed75986b3b987b997e59643fa4' tags: - csaf - vex - red-hat - cve.org epss: 0.00132 epssPercentile: 0.02757 ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-10-16T15:45:45.952890Z' ingestedAt: '2026-10-16T17:24:46.849Z' --- ## Overview A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) timer component. A lack of serialization in the userspace-driven timer (utimer) TRIGGER ioctl allows two threads to concurrently call snd_timer_interrupt(). This race condition can lead to a use-after-free vulnerability, where a timer instance is freed while its callback is still running. A local attacker with the ability to open /dev/snd/timer could exploit this to achieve privilege escalation. ## Vendor advisories - **RHSA-2026:88687** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88687) - **RHSA-2026:68507** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68507) - **RHSA-2026:68570** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68570) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68200.json) **kernel: Linux kernel: ALSA timer use-after-free vulnerability allows privilege escalation** — rated Important by Red Hat. Released 2026-08-10, updated 2026-10-23. Affected: - Red Hat Enterprise Linux 9 Fixed: - Red Hat Enterprise Linux AppStream EUS (v. 10.0) - Red Hat Enterprise Linux AppStream (v. 10) - Red Hat Enterprise Linux AppStream (v. 9) - Red Hat Enterprise Linux BaseOS EUS (v. 10.0) - Red Hat Enterprise Linux BaseOS (v. 10) - Red Hat Enterprise Linux BaseOS (v. 9) - Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) - Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) - Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) - Red Hat Enterprise Linux Real Time for NFV (v. 10) - Red Hat Enterprise Linux Real Time for NFV (v. 9) - Red Hat Enterprise Linux Real Time EUS (v. 10.0) - Red Hat Enterprise Linux Real Time (v. 10) - Red Hat Enterprise Linux Real Time (v. 9) No fix planned: - Red Hat Enterprise Linux 9 Not affected: - Red Hat Enterprise Linux 6 - Red Hat Enterprise Linux 7 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux for NVIDIA 26 ## Remediation For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:88687 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:68507 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:68570