{"id":"CVE-2026-64490","title":"ALSA: virtio: Validate control metadata from the device","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: virtio: Validate control metadata from the device\n\nvirtio-snd control handling trusts the device-provided control type and\nvalue count returned by the device.\n\nTh…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"Linux","product":"Linux","affected":["Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 3243563f99ef5d3949b934bd6390a5679405d0e1","Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 5da9742de22db0dbaa8d414214ab5e1bedde00f9","Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 21584672fd699abe1768241d6c501b2de6139b6a","Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < c77a6cbb36ff8cbc1f084d94f8dcda5250935271","Linux 6.9"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:41:24.261293Z"},"published":"2026-07-25","updated":"2026-10-19","sourceUpdated":"2026-10-19T20:48:37.167Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64490","references":[{"url":"https://git.kernel.org/stable/c/3243563f99ef5d3949b934bd6390a5679405d0e1"},{"url":"https://git.kernel.org/stable/c/5da9742de22db0dbaa8d414214ab5e1bedde00f9"},{"url":"https://git.kernel.org/stable/c/21584672fd699abe1768241d6c501b2de6139b6a"},{"url":"https://git.kernel.org/stable/c/c77a6cbb36ff8cbc1f084d94f8dcda5250935271"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64490.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64490"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507277"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64490"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64490"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072550-CVE-2026-64490-72f5@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:83707"},{"url":"https://access.redhat.com/errata/RHSA-2026:61887"},{"url":"https://access.redhat.com/errata/RHSA-2026:63129"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00193,"epssPercentile":0.08897,"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"],"scores":{"cna":8.4,"vendor":7},"ingestedAt":"2026-10-16T17:24:46.824Z","slug":"CVE-2026-64490","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nALSA: virtio: Validate control metadata from the device\n\nvirtio-snd control handling trusts the device-provided control type and\nvalue count returned by the device.\n\nThat metadata is then used directly to index g_v2a_type_map[] in\nvirtsnd_kctl_info(), and to size loops and memcpy() operations in\nvirtsnd_kctl_get() and virtsnd_kctl_put() against fixed-size\nvirtio_snd_ctl_value and snd_ctl_elem_value arrays.\n\nA buggy or malicious device can therefore trigger out-of-bounds access by\nadvertising an invalid control type or an oversized value count.\n\nValidate control type and count once in virtsnd_kctl_parse_cfg(), before\nquerying enumerated items or exposing the control to ALSA.\n\n## Affected\n\n- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 3243563f99ef5d3949b934bd6390a5679405d0e1`\n- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 5da9742de22db0dbaa8d414214ab5e1bedde00f9`\n- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < 21584672fd699abe1768241d6c501b2de6139b6a`\n- `Linux >= d6568e3de42dd971a1356f7ba581e6600d53f0a0 < c77a6cbb36ff8cbc1f084d94f8dcda5250935271`\n- `Linux 6.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:83707** · 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 2026-10-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:83707)\n- **RHSA-2026:61887** · 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 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:61887)\n- **RHSA-2026:63129** · 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 2026-09-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:63129)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64490.json)","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225252,"id":"CVE-2026-64490","ts":1792446374254,"field":"cvss","old":"7","new":"8.4"},{"seq":223802,"id":"CVE-2026-64490","ts":1792238435029,"field":"cvss","old":"8.4","new":"7"}]}