--- id: CVE-2026-64219 title: >- In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length byt… summary: >- In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length byt… severity: high cvss: 7 cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H' published: '2026-07-24' updated: '2026-07-27' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64219' references: - url: 'https://git.kernel.org/stable/c/16a5fa57565afb6bf37e18129921c270c93d8e2b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/1c8c6e912f2945b2a3e669afca6b52174b88e86e' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/1ecde19bfce6535bffddad1139ff466b6d401b8e' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/3265f3ed373fb8048be713aadcdf702579a0e53d' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/6c92f6d9600efa3ef0d9e560a2b52776d9803c29' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/90c398e822ca76e40548df0c061dd4f93ea92d71' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/d6590e3f766e3111dd1beaf88b9384d117acfa6b' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64219.json - url: 'https://access.redhat.com/security/cve/CVE-2026-64219' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2506790' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64219' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64219' - url: >- https://lore.kernel.org/linux-cve-announce/2026072416-CVE-2026-64219-75c3@gregkh/T - url: 'https://access.redhat.com/errata/RHSA-2026:57251' - url: 'https://access.redhat.com/errata/RHSA-2026:57252' - url: 'https://access.redhat.com/errata/RHSA-2026:55764' - url: 'https://access.redhat.com/errata/RHSA-2026:55765' tags: - nvd - csaf - vex - red-hat - cve.org epss: 0.00166 epssPercentile: 0.05788 ingestedAt: '2026-07-27T06:16:49.135Z' vendor: Red Hat product: Red Hat Enterprise Linux BaseOS (v. 10) affected: - enterprise_linux 7 - enterprise_linux 9 - enterprise_linux 6 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - enterprise_linux_codeready_linux_builder_v_9 - enterprise_linux_real_time_for_nfv_v_10 - enterprise_linux_nfv_v_8 - enterprise_linux_real_time_for_nfv_v_9 - enterprise_linux_real_time_v_10 - enterprise_linux_rt_v_8 - enterprise_linux_real_time_v_9 patched: - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - enterprise_linux_codeready_linux_builder_v_9 - enterprise_linux_real_time_for_nfv_v_10 - enterprise_linux_nfv_v_8 - enterprise_linux_real_time_for_nfv_v_9 - enterprise_linux_real_time_v_10 - enterprise_linux_rt_v_8 - enterprise_linux_real_time_v_9 cwe: - CWE-120 ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-10-16T15:37:34.646600Z' --- ## Overview In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async [Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy. Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access. Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used. (cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881) ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:57251** · 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 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57251) - **RHSA-2026:57252** · 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 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57252) - **RHSA-2026:55764** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55764) - **RHSA-2026:55765** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55765) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64219.json)